***Proposal Draft-Do Not Cite, Quote or Release During the Review*** Dossier for Candidate Low-Priority Substance 2-Propanol, 1,1'- oxybis- (CASRN 110-98-5) (l,l'-Dimethyldiethylene Glycol) For Release at Proposal August 9, 2019 Office of Pollution Prevention and Toxics U.S. Environmental Protection Agency 1200 Pennsylvania Avenue Washington, DC 20460 ------- ***Proposal Draft-Do Not Cite, Quote or Release During the Review*** Contents 1. Introduction 1 2. Background on 1,1 -Dimethyldiethylene Glycol 3 3. Physical-Chemical Properties 4 3.1 References 6 4. Relevant Assessment History 8 5. Conditions of Use 9 6. Hazard Characterization 12 6.1 Human Health Hazard 15 6.1.1 Absorption, Distribution, Metabolism, and Excretion 16 6.1.2 Acute Toxicity 18 6.1.3 Repeated Dose Toxicity 18 6.1.4 Reproductive and Developmental Toxicity 19 6.1.5 Genotoxicity 19 6.1.6 Carcinogenicity 19 6.1.7 Neurotoxicity 20 6.1.8 Skin Sensitization 20 6.1.9 Skin Irritation 21 6.1.10 Eye Irritation 21 6.1.11 Hazards to Potentially Exposed or Susceptible Subpopulations 21 6.2 Environmental Hazard 21 6.2.1 Acute Aquatic Toxicity 22 6.2.2 Chronic Aquatic Toxicity 22 6.3 Persistence and Bioaccumulation Potential 22 6.3.1 Persistence 22 6.3.2 Bioaccumulation Potential 23 i ------- ***Proposal Draft-Do Not Cite, Quote or Release During the Review*** 7. Exposure Characterization 24 7.1 Production Volume Information 24 7.2 Exposures to the Environment 24 7.3 Exposures to the General Population 25 7.4 Exposures to Potentially Exposed or Susceptible Subpopulations 25 7.4.1 Exposures to Workers 26 7.4.2 Exposures to Consumers 26 7.4.3 Exposures to Infants and Children 26 7.5 References 27 8. Summary of Findings 28 8.1 Hazard and Exposure Potential of the Chemical Substance 28 8.2 Persistence and Bioaccumulation 29 8.3 Potentially Exposed or Susceptible Subpopulations 30 8.4 Storage near Significant Sources of Drinking Water 30 8.5 Conditions of Use or Significant Changes in Conditions of Use of the Chemical Substance 32 8.6 The Volume or Significant Changes in Volume of the Chemical Substance Manufactured or Processed.... 32 8.7 Other Considerations 33 9. Proposed Designation 34 Appendix A: Conditions of Use Characterization I A.1 CDR Manufacturers and Production Volume I A.2 Uses II A.2.1 Methods for Uses Table II A.2.2 Uses of 1,1 '-Dimethyldiethylene Glycol V A.3. References XX Appendix B: Hazard Characterization XXIII B.1 References: XLII Appendix C: Literature Search Outcomes XLVII C.1 Literature Search and Review XLVII C.1.1 Search for Analog Data XLVII C.1.2 Search Terms and Results XLVII I ii ------- ***Proposal Draft-Do Not Cite, Quote or Release During the Review*** C.2 Excluded Studies and Rationale LI C.2.1 Human Health Hazard Excluded References LI C.2.2 Environmental Hazard LIX C.3 Fate LXIV iii ------- ***Proposal Draft-Do Not Cite, Quote or Release During the Review*** Tables Table 1:1,1-Dimethyldiethylene Glycol at a ^ Glance Table 2: Physical-Chemical Properties for 1,1-Dimethyldiethylene Glycol 4 Table 3: Conditions of Use for 1,1-Dimethyldiethylene Glycol 11 Table 4: Low-Concern Criteria for Human Health and Environmental Fate and Effects 12 Table 5:1,1-Dimethyldiethylene Glycol and Analog ^ Structures Table A.1:1986-2015 National Production Volume Data for 1,1-Dimethyldiethylene Glycol (Non- Confidential Production Volume in I Pounds) Table A.2: Sources Searched for Uses of 1,1-Dimethyldiethylene Glycol Table A3: Uses of 1,1-Dimethyldiethylene Glycol V Table B.1: Human Health Hazard XXIII Table B.2: Environmental Hazard XXXVII Table B.3: Fate XXXVIII Table C.1: Search Terms Used in Peer-Reviewed Databases XLIX Table C.2: Search Terms Used in Grey Literature and Additional Sources L Table C.3: Off-Topic References Excluded at Title/Abstract Screening for Human Health Hazard LI Table C.4: Screening Questions and Off-Topic References Excluded at Full-text Screening for Human Health Hazard Table C.5: Data Quality Metrics and Unacceptable References Excluded at Data Quality Evaluation for Human Health Hazard - Animal Table C.6: Data Quality Metrics and Unacceptable References Excluded at Data Quality Evaluation for Human Health Hazard - In Vitro Table C.7: Off-Topic References Excluded at Title/Abstract Screening for Environmental Hazard LX Table C.8: Screening Questions and Off-Topic References Excluded at Full-text Screening for Environmental Hazard LXII iv ------- ***Proposal Draft-Do Not Cite, Quote or Release During the Review*** Table C.9: Data Quality Metrics and Unacceptable References Excluded at Data Quality Evaluation for Environmental Hazard Table C.10: Off-Topic References Excluded at Initial Screening for Fate LXIV Table C.11: Screening Questions and Off-Topic References Excluded at Full-text Screening for Fate LXVI Table C.12: Data Quality Metrics and Unacceptable References Excluded at Data Quality Evaluation for _ , LXVI Fate v ------- ***Proposal Draft - Do Not Cite, Quote or Release During the Review*** 1. Introduction In the Lautenberg amendments to the Toxic Substances Control Act (TSCA) (section 6(b)(1)(B)) and implementing regulations (40 CFR 702.3), a low-priority substance is described as a chemical substance that the Administrator concludes does not meet the statutory criteria for designation as a high-priority substance, based on information sufficient to establish that conclusion, without consideration of costs or other non-risk factors. A high-priority substance is defined as a chemical substance that the Administrator concludes, without consideration of costs or other non-risk factors, may present an unreasonable risk of injury to health or the environment because of a potential hazard and a potential route of exposure under the conditions of use, including an unreasonable risk to potentially exposed or susceptible subpopulations identified as relevant by the Administrator. 2-Propanol, l,l'-oxybis-, referenced as 1,1'- dimethyldiethylene glycol for the remainder of this document, is one of the 40 chemical substances initiated for prioritization as referenced in a March 21, 2019 notice (84 FR 10491).1 Before determining low or high prioritization status, under EPA's regulations at 40 CFR 702.92 and pursuant to section 6(b)(1)(A) of the statute, EPA will generally use reasonably available information to screen the candidate chemical substance under its conditions of use against the following criteria and considerations: • the hazard and exposure potential of the chemical substance; • persistence and bioaccumulation; • potentially exposed or susceptible subpopulations; • storage near significant sources of drinking water; • conditions of use or significant changes in the conditions of use of the chemical substance; • the chemical substance's production volume or significant changes in production volume; and • other risk-based criteria that EPA determines to be relevant to the designation of the chemical substance's priority. Designation of a low-priority substance indicates that the chemical substance does not meet the statutory criteria for a high-priority substance and that a risk evaluation is not warranted at the time. This risk-based, screening-level review is organized as follows: • Section 1 (Introduction): This section explains the requirements of the Lautenberg amendments to the Toxic Substances Control Act (TSCA) and implementing regulations - including the criteria and considerations ~ pertinent to prioritization and designation of low-priority substances. • Section 2 (Background on the proposed Low-Priority Substance): This section includes information on attributes of the chemical substance, including its structure, and relates them to its functionality. 1 https://www.federalregister.gov/documents/2019/03/21/2019-05404/imtiation-of-prioritization-under-tlie-toxic-substances- control-act-tsca 2 The prioritization process is explained in the Procedures for Prioritization of Chemicals for Risk Evaluation Under the Toxic- Substances Control Act (82 FR 33753). 1 ------- ***Proposal Draft - Do Not Cite, Quote or Release During the Review*** • Section 3 (Physical-Chemical Properties) : This section includes a description of the physical- chemical properties of the chemical substance and explains how these properties lead to the chemical's fate, transport, and exposure potential. • Section 4 (Relevant Assessment History): This section includes an overview of the outcomes of other governing entities" assessments of the chemical substance. • Section 5 (Conditions of Use): This section presents the chemical substance's known, intended, and reasonably foreseen conditions of use under TSCA. • Section 6 (Hazard Characterization): This section summarizes the reasonably available hazard information and benchmarks the information against low-concern thresholds. • Section 7 (Exposure Characterization): This section includes a qualitative summary of potential exposures to the chemical substance. • Section 8 (Summary of Findings): In this section, EPA presents information pertinent to prioritization against each of the seven statutory and regulatory criteria and considerations, and proposes a conclusion based on that evidence. • Section 9 (Proposed Designation): In this section, EPA presents the proposed designation for this chemical substance. • Appendix A (Conditions of Use Characterization): This appendix contains a comprehensive list of TSCA and non-TSCA uses for the chemical substance from publicly available databases. • Appendix B (Hazard Characterization): This appendix contains information on each of the studies used to support the hazard evaluation of the chemical substance. • Appendix C (Literature Search Outcomes): This appendix includes literature search outcomes and rationales for studies that were identified in initial literature screening but were found to be off- topic or unacceptable for use in the screening-level review. 2 ------- ***Proposal Draft - Do Not Cite, Quote or Release During the Review*** 2. Background on 1,1-Dimethyldiethylene Glycol Table 1 below provides the CAS number, synonyms, and other information on l,r-dimethyldiethylene glycol. Table 1:1,1-Dimethyldiethylene Glycol at a Glance Chemical Name 1,1 '-Dimethyldiethylene Glycol CASRN 110-98-5 Synonyms 1,1 '-oxydi-2-propanol; 1,1 '-Oxydipropan-2-ol; 2-Propanol, 1,1 '-oxybis-; 1,1 '-Oxybis-2- propanol; 2,2'-Dihydroxydipropyl ether; 2-Propanol, 1,1'-oxydi- Trade Name(s) NIAX Catalyst D-19 Molecular Formula C6H14O3 Representative Structure ch3 ch3 Source(s): Kimetal. (2016); NLM (2018a) l,l'-Dimethyldiethylene glycol is a P-series glycol ether, meaning that it is made from propylene oxide. Glycol ethers are organic chemical compounds that contain both an alcohol functional group (R-OH) and an ether functional group, which is an oxygen atom connected to two alkyl groups (R-O-R ). 1,1'- Dimethyldiethylene glycol is an isomer of dipropylene glycol with two iso-propyl groups on either side of the ether group. l,l'-Dimethyldiethylene glycol is produced as a byproduct of the manufacture of propylene glycol. l,l'-Dimethyldiethylene glycol is an odorless solvent with a high boiling point and is completely soluble in water while also maintaining the ability to dissolve oils. In addition, 1,1'- dimethyldiethylene glycol is hygroscopic and acts as a humectant, which means it absorbs water and increases hydration in products. l,l'-Dimethyldiethylene glycol also functions as a plasticizer and as a plasticizer intermediate in the formation of polyurethane polyols to give improved flexibility and resistance to cracking at low temperatures. A plasticizer is a substance that is added to a material to alter its physical properties, mainly to increase flexibility or decrease viscosity. These properties make 1,1'- dimethyldiethylene glycol a multifunctional ingredient used in a variety of applications and product sectors. Section 5 includes conditions of use for this chemical. 3 ------- ***Proposal Draft-Do Not Cite, Quote or Release During the Review *** 3. Physical-Chemical Properties Table 2 lists physical-chemical properties for l,r-dimethyldiethylene glycol. A chemical's physical-chemical properties provide a basis for understanding a chemical's behavior, including in the environment and in living organisms. These endpoints provide information generally needed to assess potential environmental release, exposure, and partitioning as well as insight into the potential for adverse toxicological effects. Table 2: Physical-Chemical Properties for 1,1 '-Dimethyldiethylene Glycol Source/ Model Data Type Endpoint Endpoint value Notes HSDB2019 Experimental Physical state at room temp (based on melting point) Liquid (< -40°C) HSDB2019; International Chemical Safety Card, 2017; OECDSIDS, 2001; Chadwick 1988 Experimental Molecular weight 134 g/mol EPISuite v.4.113 Calculated Molecular weight 134.18 g/mol Lyman 1990 Experimental Molar volume 166 cm3/mol HSDB Experimental Water solubility 1.00x105 mg/L The PhysProp database reports a measured water solubility of 0.1 mg/L. This appears to be in error, (1) because it is too low and (2) HSDB reports a value of 100 g/L citing the same source (CITI, Japan). International Chemical Safety Card; OECD SIDS 2001 Experimental Water solubility 1000000 mg/L (miscible) EPISuite v.4.11 Estimated Water solubility 1.0x106 mg/L International Chemical Safety Card; OECD SIDS 2001 Experimental Water solubility 7.45 mol/L HSDB Experimental Water solubility 7.45x10-1 mol/L ECHA Experimental Log Kow -0.462 at21.7°C and pH 6 3 EPI Suite Physical Property Inputs - Boiling Point = 232.8 deg C, Melting Point = -40 deg C, Vapor Pressure = 0.03 mm Hg, Water Solubility = 1000000 mg/L, Log P = -0.7, SMILES: OC(C)COCC(C)0 4 ------- ***Proposal Draft-Do Not Cite, Quote or Release During the Review *** Table 2: Physical-Chemical Properties for 1,1 '-Dimethyldiethylene Glycol Source/ Model Data Type Endpoint Endpoint value Notes International Chemical Safety Card 2019 Experimental Log Kow -0.7/-1.5 OECDSIDS 2001 Experimental Log Kow -1.486; -0.687 EPISuite v.4.11 Estimated Log Kow -0.64 EPISuite v.4.11 Estimated Log Koa 6.14 EPISuite v.4.11 Estimated Log Koc 0 (MCI); -0.38 (Kow) HSDB; International Chemical Safety Card 2019 Experimental Vapor pressure 0.03 mm HG (4 Pa) at 25°C OECDSIDS 2001 Experimental Vapor pressure <0.075 at 20 °C; <0.01 at 20 °C; 0.04 at 21 °C Chadwick 1988 Experimental Vapor pressure <0.0075 (0.001 kPa) at 20 °C EPISuite v.4.11 Estimated Vapor pressure 6.28x10-3 mm HG EPISuite v.4.11 Estimated Henry's Law <1E-8 atm-m3/mole EPISuite v.4.11 Estimated Volatilization 5300 days (river) 58000 days (lake) EPISuite v.4.11 Estimated Photolysis (Indirect) 4.1 hours (T1/2) • OH rate constant 3.31 E-11 cm3/molecules-second (12 hour day; 1.5E6 OH/cm3) • No ozone prediction EPISuite v.4.11 Estimated Hydrolysis Rate constants cannot be estimated No reactive functional groups EPISuite v.4.11 Estimated Biodegradation potential Ready prediction: Yes EPISuite v.4.11 Estimated BAF 0.9 EPISuite v.4.11 Estimated BCF 3.16 Based on regression equation 5 ------- *** Proposal Draft - Do Not Cite, Quote or Release During the Review*** Based on its reported physical form and melting point, l,r-dimethyldiethylene glycol is a liquid under ambient conditions (HSDB 2019). Exposure through direct dermal contact with the substance is possible, but concern is lessened because this chemical is a slow skin penetrant (discussed in Section 6.1.1) and likely to be minimally absorbed through skin based on its molecular weight, water solubility and log Kow. Because of its measured vapor pressure (OECD SIDS, 2001), 1,1'- dimethyldiethylene glycol is expected to be volatile when in neat form at ambient temperatures. As a result, exposure to 1,1'dimethyldiethylene glycol is possible through inhalation of vapors or aerosols if they are generated. Based on measured solubility data (HSDB, 2019), l,r-dimethyldiethylene glycol is considered water soluble, indicating the potential for this substance to dissolve in water and form an aqueous solution. Water soluble substances have an increased potential for absorption through the lungs; therefore, if inhalation of vapors or aerosols occurs, absorption through the lungs is likely. Exposure potential changes if 1,1'dimethyldiethylene glycol is present in diluted form. The estimated Henry's Law constant (EPI Suite, 2019) for l,l'-dimethyldiethylene glycol indicates volatilization from water and aqueous solutions is not expected; therefore, exposure through breathing vapor from a dilute form is expected to be minimal. Absorption and sequestration in fatty tissues are unlikely, as reflected in the estimated bioconcentration (BCF) and bioaccumulation (BAF) values for this compound (EPI Suite, 2019). The estimated log Koc (EPI Suite, 2019) indicates this substance is highly mobile in soils, increasing its potential for leaching into groundwater, including ground water sources of drinking water. If oral exposure occurs via ingestion of contaminated drinking water, including well water, absorption through the gastrointestinal tract is likely based on experimental evidence (discussed in Section 6.1.1). Concern for presence in drinking water is reduced in part by 1,1'dimethyldiethylene glycol's expected low persistence based on read-across from closely-related analogs (discussed in Section 6.3.1) and low-hazard findings from toxicological studies of organisms exposed to a closely-related analog in drinking water (discussed in Section 6.1). 3.1 References Chadwick, Sharon S. (1988). "Ullmann's Encyclopedia of Industrial Chemistry", Reference Services Review, Vol. 16 Issue: 4, pp.31-34, https://doi.org/10.1108/eb049034 Hazardous Substance Database (HSDB). (2016). 2,2'-Dihydroxydi-n-propyl ether. Retrieved from http s: //toxnet .nlm.nih.gov/ European Chemicals Agency (ECHA). (2019). l,l'-oxydipropan-2-ol. Retrieved from https://echa.europa.eu/substance-information/-/substanceinfo/100.003.475 International Chemical Safety Card (ICSC). (2019). Retrieved from https://www.ilo.org/dvn/icsc/showcard.displav7p lang=en&p card id=1055&p version=2 Lyman, Warren J., Reehl, W. F., Rosenblatt, D. H. (1990). Handbook of chemical property estimation methods: environmental behavior of organic compounds. American Chemical Society OECD SIDS (2001). Dipropylene glycol (mixed isomers and dominant isomer Cas No: 25265-71-8 and 110-98-5 https://heronet.epa.gov/heronet/index.cfm/reference/download/reference id/4940388 6 ------- *** Proposal Draft - Do Not Cite, Quote or Release During the Review*** U.S. EPA. (2019). Estimation Programs Interface Suite, v 4.11. United States Environmental Protection Agency, Washington, DC, USA 7 ------- *** Proposal Draft - Do Not Cite, Quote or Release During the Review*** 4. Relevant Assessment History EPA assessed the toxicological profile of l,r-dimethyldiethylene glycol and added the chemical to the Safer Choice Program's Safer Chemical Ingredients List (SCIL) in December 2012 under the functional class of solvents. The SCIL4 is a continuously updated list of chemicals that meet low- concern Safer Choice criteria. 5 EPA also reviewed international assessments of l,rdimethyldiethylene glycol. EPA identified assessments by the Organisation for Economic Co-operation and Development (OECD), and government agencies in Canada, Germany, and Japan. The Organisation for Economic Co-operation and Development (OECD) Screening Information Datasets (SIDS) Initial Assessment Meeting (SIAM) discussed the SIDS Initial Assessment Report (SIAR) on l,r-dimethyldiethylene glycol (dipropylene glycol, mixed isomers and dominant isomer), in January 2001. The SIAM determined this chemical to be "low priority for further work" for human health and the environment.6 The Canadian Government, through an assessment of toxicity and exposure as part of its categorization of the Domestic Substance List, found that l,r-dimethyldiethylene glycol did not meet its criteria for further attention.7 Japan's National Institute of Technology and Evaluation (NITE) categorized l,l'-dimethyldiethylene glycol as Exposure Class 4 in 2017, which is the lowest concern hazard ranking assigned.8 The German Environment Agency (UBA) designated l,l'-dimethyldiethylene glycol as "low hazard to waters" in August 2017 based on an assessment of ecotoxicity and environmental fate.9 4 https://www.epa.gov/saferchoice/safer-ingredients 5 https://www.epa.gov/sites/production/files/2013-12/documents/dfe master criteria safer ingredients v2 l.pdf 0 https://hpvchemicals.oecd.org/ui/handler.axd?id=40da06bl-a855-4c0c-bc21-bbc856dca725 7 https://canadachemicals.oecd. org/ChemicalDetails.aspx?ChemicalID=AD9A3337-870A-4CE5-8E04-DACE72B5D465 8 http://www.safe.nite.go.ip/icheck//direct.action?TYPE=DPAGE 1 &CAS= 110-98-5&MITI=2-413 9 https://webrigoletto.uba.de/rigoletto/public/searcliDetail.do7kennummeF2618 8 ------- *** Proposal Draft - Do Not Cite, Quote or Release During the Review*** 5. Conditions of Use Per TSCA section 3(4), the term "conditions of use" means the circumstances, as determined by the Administrator, under which a chemical substance is intended, known, or reasonably foreseen to be manufactured, processed, distributed in commerce, used, or disposed of. EPA assembled information on all uses of l,r-dimethyldiethylene glycol (Appendix A) to inform which uses would be determined conditions of use.1" One source of information that EPA used to help determine conditions of use is 2016 Chemical Data Reporting (CDR). The CDR rule (previously known as the Inventory Update Rule, or IUR), under TSCA section 8, requires manufacturers (including importers) to report information on the chemical substances they produce domestically or import into the U.S., generally above a reporting threshold of 25,000 lb. per site per year. CDR includes information on the manufacturing, processing, and use of chemical substances with information dating to the mid-1980s. CDR may not provide information on other life-cycle phases such as the chemical substance's end-of- life after use in products (i.e., disposal). According to CDR, l,r-dimethyldiethylene glycol is manufactured domestically and imported. It is used in processing (incorporation into formulation, mixture or reaction) for plastics product manufacturing, soap, cleaning compound, and toilet preparation manufacturing; it is also used in processing plastic material and resin. Examples of industrial uses include construction and building materials and mining support activities. Consumer and commercial uses include air care products; cleaning and furnishing care products; laundry and dishwashing products; plastic and rubber products; arts and crafts; and toys, among others. Based on the known manufacturing, processing, and uses of this chemical substance, EPA assumes distribution in commerce. In the 2016 CDR, two facilities reported that l,rdimethyldiethylene glycol was not recycled (which could mean recycled, reprocessed, or reused). For one facility, recycling information was withheld. No information on disposal is found in CDR or through EPA's Toxics Release Inventory (TRI) Program11 because 1.1- dimethyldiethylene glycol is not a TRI-reportable chemical. Although reasonably available information did not specify additional types of disposal, for purposes of this proposed prioritization designation, EPA assumed end-of-life pathways that include releases to air, wastewater, surface water, and land via solid and liquid waste based on the conditions of use (e.g., incineration, landfill). To supplement CDR, EPA conducted research through the publicly available databases listed in Appendix A (Table A.2) and performed additional internet searches to clarify conditions of use or find additional occupational12 and consumer uses. This research improved the Agency's understanding of the conditions of use for l,l'-dimethyldiethylene glycol. Although EPA identified uses of l,l'-dimethyldiethylene glycol in personal care products, this screening review covers TSCA conditions of use for the chemical substance and personal care products are not considered further in EPA's assessment. Exclusions to TSCA's regulatory scope regarding "chemical substance" can be found at TSCA section 3(2). Table 3 lists the conditions of use for l,l'-dimethyldiethylene glycol 10 The prioritization process, including the definition of conditions of use, is explained in the Procedures for Prioritization of Chemicals for Risk Evaluation Under the Toxic Substances Control Act (82 FR 33753). 11 https://www.epa.gov/toxics-release-inventorv-tri-program 12 Occupational uses include industrial and/or commercial uses 9 ------- *** Proposal Draft - Do Not Cite, Quote or Release During the Review*** considered for chemical substance prioritization, per TSCA section 3(4). Table 3 reflects the TSCA uses determined as conditions of use listed in Table A.3 (Appendix A). 10 ------- *** Proposal Draft - Do Not Cite, Quote or Release During the Review*** Table 3: Conditions of Use for 1,1'Dimethyldiethylene Glycol Life Cycle Stage Category Subcategory of Use Source Manufacturing Import Import EPA (2017b) Processing Processing- incorporation into Plasticizers - plastics product manufacturing EPA (2017b) formulation, mixture or reaction Odor agents - soap, cleaning compound, and toilet preparation manufacturing; all other chemical product and preparation manufacturing Processing—incorporation into article Odor agents - plastic material and resin manufacturing Industrial manufacturing Automotive care, automotive fuel, automotive manufacturing; detergents manufacturing; electronic equipment manufacturing; furniture manufacturing; leather manufacturing; machinery and equipment manufacturing; paints, varnishes, and coatings manufacturing; paper, pulp, and paper product manufacturing; perfumes manufacturing; textile manufacturing; transport equipment manufacturing CPCat (2019); Synapse Information Resources (2009) Fabricated metal product manufacturing Fabricated metal products; metal treatment and coating Construction and building materials covering large surface areas Wood manufacturing CPCat (2019) Food-contact metallic manufacturing Synapse Information Resources (2009) Recycling Recycling EPA (2017b)13 Distribution Distribution Distribution EPA (2017b) Construction and building materials covering large surface areas Boat and ship building; construction; floor and wall materials; glass building materials CPCat (2019); Synapse Information Resources (2009) Industrial Mining (except oil and gas) support activities Mining (except oil and gas) support activities Other Industrial cleaning Industrial/ commercial Anti-foaming agents CPCat (2019) Commercial Ostomy bag deodorizer Medline.com (2017) Commercial/ Air care products EPA (2017b); consumer Cleaning and furnishing care products 13 In the 2016 CDR, two facilities reported that lj'-dimethy Methylene glycol was not recycled (which could mean recycled, reprocessed, or reused). For one facility, recycling information was withheld. No further information about recycling or disposal was found. 11 ------- *** Proposal Draft - Do Not Cite, Quote or Release During the Review*** Table 3: Conditions of Use for 1,1'Dimethyldiethylene Glycol Life Cycle Stage Category Subcategory of Use Source Laundry and dishwashing products CPCat (2019) Plastic and rubber products not covered elsewhere Consumer Arts, crafts, and hobby materials; Marker pens CPCat (2019) Furniture and furnishings not covered elsewhere Baby mattresses and pillows Decor candle Printing inks Unknown Hydraulic brake fluid; windshield washing agents; degreasers; lime deposit (calcium) remover; textile detergent; food and beverage service activities; food-contact coatings; food packaging; fuel additive; petroleum additive; absorbents/adsorbents; adhesives and binding agents; colorant; corrosion inhibitor; polishing agent; preservatives Synapse Information Resources (2009); CPCat (2019) Disposal Releases to air, wastewater, solid and liquid wastes Though not explicitly identified, releases from disposal are assumed to be reasonably foreseen14 14 See Section 5 for a discussion on why releases are assumed to be reasonably foreseen for purposes of this proposed prioritization designation. 12 ------- *** Proposal Draft - Do Not Cite, Quote or Release During the Review*** 6. Hazard Characterization EPA reviewed primary literature and other data sources to identify reasonably available information on hazard for l,r-dimethyldiethylene glycol. This literature review approach15 is tailored to capture the reasonably available information associated with low-hazard chemicals. EPA also used this process to verify the reasonably available information for reliability, completeness, and consistency. EPA reviewed the reasonably available information to identify relevant, quality studies to evaluate the hazard potential for l,r-dimethyldiethylene glycol against the endpoints listed below. EPA's New Chemicals Program has used these endpoints for decades to evaluate chemical substances under TSCA16 and EPA toxicologists rely on these endpoints as key indicators of potential human health and environmental effects. These endpoints also align with internationally accepted hazard characterization criteria, such as the Globally Harmonized System of Classification and Labelling of Chemicals17 as noted above in Section 4 and form the basis of the comparative hazard assessment of chemicals. Human health endpoints evaluated: Acute mammalian toxicity, repeated dose toxicity, carcinogenicity, mutagenicity/genotoxicity, reproductive and developmental toxicity, neurotoxicity, skin sensitization, and eye and skin irritation. Environmental fate and effects endpoints evaluated: Aquatic toxicity, environmental persistence, and bioaccumulation. The low-concern criteria used to evaluate both human health and environmental fate and effects are included in Table 4 below. Table 4: Low-Concern Criteria for Human Health and Environmental Fate and Effects Human Health Acute Mammalian Toxicity18 Very High High Moderate Low Oral LDso (mg/kg) <50 > 50 - 300 > 300 - 2000 >2000 Dermal LD50 (mg/kg) <200 > 200- 1000 > 1000 -2000 >2000 Inhalation LC50 (vapor/gas) (mg/L) <2 >2-10 >10-20 >20 Inhalation LC50 (dust/mist/fume) (mg/L) <0.5 >0.5-1.0 >1.0-5 >5 1'Discussed in the document "Approach Document for Screening Hazard Information for Low-Priority Substances Under TSCA", also released at proposal. 10 https://www.epa. gov/sustainable-futures/sustainable-futures-p2-framework-manual 17 https://www.unece.org/fileadmin/DAM/trans/danger/publi/ghs/ghs rev07/English/ST SG AC10 30 Rev7e.pdf 18 Values derived from GHS criteria (Chapter 3.1: Acute Toxicity'. 2009, United Nations). 12 ------- *** Proposal Draft - Do Not Cite, Quote or Release During the Review*** Table 4: Low-Concern Criteria for Human Health and Environmental Fate and Effects Repeated Dose Toxicity (90-day study)19 High Moderate Low Oral (mg/kg-bw/day) < 10 10-100 >100 Dermal (mg/kg- bw/day) <20 20 - 200 >200 Inhalation (vapor/gas) (mg/L/6h/day) <0.2 0.2-1.0 >1.0 Inhalation (dust/mist/fume) (mg/L/6h/day) <0.02 0.02-0.2 >0.2 Reproductive Toxicity20 High Moderate Low Oral (mg/kg/day) <50 50 - 250 >250 Dermal (mg/kg/day) < 100 100-500 >500 Inhalation (vapor, gas, mg/L/day) < 1 1-2.5 >2.5 Inhalation (dust/mist/fume, mg/L/day) <0.1 0.1-0.5 >0.5 Developmental Toxicity20 High Moderate Low Oral (mg/kg/day) <50 50 - 250 >250 Dermal (mg/kg/day) < 100 100-500 >500 Inhalation (vapor, gas, mg/L/day) < 1 1-2.5 >2.5 Inhalation (dust/mist/fume, mg/L/day) <0.1 0.1-0.5 >0.5 Mutagenicity/ Genotoxicity21 Very High High Moderate Low Germ cell mutagenicity GHS Category 1A or 1B: Substances known to induce heritable mutations or to be regarded as if they induce heritable mutations GHS Category 2: Substances which cause concern for humans owing to the possibility that they may induce heritable mutations in the germ cells of humans. Evidence of mutagenicity support by positive results in vitro OR in vivo somatic cells of humans or animals Negative for chromosomal aberrations and gene mutations, or no structural alerts. 19 Values from GHS criteria for Specific Target Organ Toxicity Repeated Exposure (Chapter 3.9: Specific Target Organ Toxicity' Repeated Exposure. 2009, United Nations). 20 Values derived from the U.S. EPA's Office of Pollution Prevention & Toxics criteria for HPV chemical categorizations (Methodology* for Risk-Based Prioritization Under ChM tP), and the EU REACH criteria for Annex IV (2007). 21 From GHS criteria (Chapter 3.5: Germ Cells Mutagenicity'. 2009, United Nations) and supplemented with considerations for mutagenicity and genotoxicity in cells other than germs cells. 13 ------- *** Proposal Draft - Do Not Cite, Quote or Release During the Review*** Table 4: Low-Concern Criteria for Human Health and Environmental Fate and Effects in the germ cells of humans. Mutagenicity and genotoxicity in somatic cells OR Evidence of mutagenicity supported by positive results in in vitro AND in vivo somatic cells and/or germ cells of humans or animals. Carcinogenicity22 Very High High Moderate Low Known or presumed human carcinogen (GHS Category 1Aand 1B) Suspected human carcinogen (GHS Category 2) Limited or marginal evidence of carcinogenicity in animals (and inadequate23 evidence in humans) Negative studies or robust mechanism- based structure activity relationship (SAR) Neurotoxicity (90-day study)19 High Moderate Low Oral (mg/kg-bw/day) < 10 10-100 >100 Dermal (mg/kg- bw/day) <20 20 - 200 >200 Inhalation (vapor/gas) (mg/L/6h/day) <0.2 CD CM CD >1.0 Inhalation (dust/mist/fume) (mg/L/6h/day) <0.02 0.02-0.2 >0.2 Sensitization24 High Moderate Low Skin sensitization High frequency of sensitization in humans and/or high potency in animals (GHS Category 1A) Low to moderate frequency of sensitization in human and/or low to moderate potency in animals (GHS Category 1B) Adequate data available and not GHS Category 1Aor 1B Respiratory sensitization Occurrence in humans or evidence of sensitization in humans based on Limited evidence including the presence of structural alerts Adequate data available indicating lack of respiratory sensitization 11 Criteria mirror classification approach used by the IARC (Preamble to the L4RC Monographs: B. Scientific Review and Evaluation: 6. Evaluation and rationale. 2019) and incorporate GHS classification scheme (Chapter 3.6: Carcinogenicity. 2009, United Nations). 23 This process is further discussed in the document "Approach Document for Screening Hazard Information for Low- Priority Substances Under TSCA." 24 From GHS criteria (Chapter 3.4: Respiratory or Skin Sensitization. 2009, United Nations). 14 ------- *** Proposal Draft - Do Not Cite, Quote or Release During the Review*** Table 4: Low-Concern Criteria for Human Health and Environmental Fate and Effects animal or other tests (equivalent to GHS Category 1A or 1B) Irritation/ Corrosivity25 Very High High Moderate Low Eye irritation/ corrosivity Irritation persists for >21 days or corrosive Clearing in 8-21 days, severely irritating Clearing in 7 days or less, moderately irritating Clearing in less than 24 hours, mildly irritating Skin irritation/ corrosivity Corrosive Severe irritation at 72 hours Moderate irritation at 72 hours Mild or slight irritation at 72 hours Environmental Fate and Effects Acute Aquatic Toxicity Value (L/E/ICso)26 Chronic Aquatic Toxicity Value (L/E/ICso)26 Persistence (Measured in terms of level of biodegradation)27 Bioaccumulation Potential28 May be low concern if <10 ppm... ...and <1 ppm... ...and the chemical meets the 10-day window as measured in a ready biodegradation test... Low concern if >10 ppm and <100 ppm... ...and >1 ppm and <10 ppm... ...and the chemical reaches the pass level within 28 days as measured in a ready biodegradation test ...and BCF/BAF < 1000. Low concern if >100 ppm... ...and > 10 ppm... ... and the chemical has a half-life < 60 days... 6.1 Human Health Hazard Below is a summary of the reasonably available information that EPA included in the hazard evaluation of l,r-dimethyldiethylene glycol. In many cases, EPA used analogous chemicals to make findings for a given endpoint. Where this is the case, use of the analog is explained. If the chemical studied is not named, the study is for l,r-dimethyldiethylene glycol. Appendix B contains more information on each study. l,r-Dimethyldiethylene glycol is an isomer of dipropylene glycol in which the methyl groups are specified to be at the 1 and 1" positions. EPA used best professional judgement to select analogs for l,r-dimethyldiethylene glycol based on similarity in structure, physical-chemical properties, and functionality, with the assumption that these chemicals will have similar environmental transport and persistence characteristics, and bioavailability and toxicity profiles. Both of the analogs listed in 25 Criteria derived from the Office of Pesticide Programs Acute Toxicity Categories (U.S. EPA. Label Review Manual. 2010). 20 Derived from GHS criteria (Chapter 4.1: Hazards to the Aquatic Environment. 2009, United Nations), EPA OPPT New Chemicals Program (Pollution Prevention (P2) Framework, 2005) and OPPT's criteria for HPV chemical categorization (Methodology> for Risk Based Prioritization Under C1l4MP. 2009). 27 Derived from OPPT's New Chemicals Program and DIE Master Criteria and reflects OPPT policy on PBTs (Design for the Environment Program Master Criteria for Safer Chemicals, 2010). 28 Derived from OPPT's New Chemicals Program and Arnot & Gobas (2006) [Arnote, J.A. and F,A. Gobas, A review of bioconcentration factor (BCF) and bioaccimndation factor (B*4F) assessments for organic chemicals in aquatic organisms. Environmental Reviews, 2006. 14: p. 257-297.] 15 ------- *** Proposal Draft - Do Not Cite, Quote or Release During the Review*** Table 5 are oligomeric propylene glycols like the l,r-dimethyldiethylene glycol. The analog dipropylene glycol is a condensation product of two propylene oxide (methyl oxirane) units and is a mixture of isomers differing only in the placement of the methyl substituents. l,r-dimethyldiethylene glycol is one of its components. The analog tripropylene glycol is a condensation product of three propylene oxide units and does not have a specified placement of the methyl groups in each unit. Differences in the methyl group positions in these chemicals are not expected to significantly affect their chemical and hazard profiles. Based on these factors, the environmental and toxicological effects of tripropylene glycol and dipropylene glycol are expected to be very similar to each other and to l,r-dimethyldiethylene glycol. Table 5:1,1'Dimethyldiethylene glycol and Analog Structures CASRN Name Structure 110-98-5 1,1'- Dimethyldiethylene glycol ch3 ch3 Representative structure 24800-44-0 Tripropylene glycol (mixed isomers) CH, CH, CH, Representative structure 25265-71-8 Dipropylene glycol (mixed isomers) CHj CHS HO JL JL - OH O N/ c CHj CHj t mix Representative structure 6.1.1 Absorption, Distribution, Metabolism, and Excretion Absorption To assess l,r-dimethyldiethylene glycol's absorption potential, EPA used experimental studies from analogs. In a study on dogs, dipropylene glycol was rapidly absorbed from the gastrointestinal tract 16 ------- *** Proposal Draft - Do Not Cite, Quote or Release During the Review*** and was no longer detectable in the blood 24 hours after an oral exposure (BUA. 1996). Rats exposed to 14C-tripropylene glycol by oral gavage also rapidly absorbed tripropylene glycol, as indicated by recovery of 91.4% of the administered dose 24 hours following exposure (ECHA. 1995a). Based on these data, l,r-dimethyldiethylene glycol is expected to be absorbed after oral exposures. In vitro studies were used to assess the potential dermal absorption by l,r-dimethyldiethylene glycol using read-across from dipropylene glycol. Excised abdominal skin from human cadavers demonstrated dipropylene glycol is a slow penetrant, with the results demonstrating a permeability coefficient of 3.85 x 10"5 cm/hour (Fasano et al.. 2011; ECHA. 2007b; Fasano. 2007). Based on these data, potential for absorption of l,r-dimethyldiethylene glycol through the skin is low. Based on its low molecular weight and high water solubility (discussed in Section 3), 1,1'- dimethyldiethylene glycol is expected to be absorbed from the lungs if inhaled. Distribution l,l'-Dimethyldiethylene glycol is considered water soluble based on its physical-chemical properties (Table 2) and is likely to be distributed mainly in aqueous compartments in an organism. This prediction is supported by experimental evidence on the analog tripropylene glycol. Rats exposed to tripropylene glycol by oral gavage displayed radiolabeled tripropylene glycol in the tissues and the carcass 24 hours following exposure (OECD. 2001; ECHA. 1995a). Specifically, tripropylene glycol was reported in the liver at 0.20%, kidneys at 0.09%, carcass at 0.06%, blood at 0.03%, and skin, brain, muscle, and fat at less than 0.03% (as percent of the administered dose per gram of tissue). These data indicate tissue distribution of tripropylene glycol to the liver and kidney and provide evidence that l,l'-dimethyldiethylene glycol will be rapidly distributed following oral absorption. Metabolism To assess l,l'-dimethyldiethylene glycol's metabolism pathways, EPA used experimental studies from analogs. Oral administration of tripropylene glycol to rats resulted in rapid metabolism to dipropylene glycol, then to propylene glycol, which is converted to lactic and pyruvic acids or excreted in the urine. Lactate and pyruvate may be further metabolized through the citric acid cycle to yield carbon dioxide and water or may be stored as glycogen (OECD. 2001). Rats exposed to 14C- tripropylene glycol by oral gavage excreted approximately 13% as free or conjugated tripropylene glycol, approximately 8.4% as free and conjugated dipropylene glycol, and approximately 3.9% as free and conjugated propylene glycol (OECD. 2001; ECHA. 1995a). These data indicate that 1,1'- dimethyldiethylene glycol will be rapidly metabolized. Excretion To assess l,l'-dimethyldiethylene glycol's excretion pathways, EPA used experimental evidence from tripropylene glycol. Following the oral administration of tripropylene glycol to rats, 52% was recovered in urine, 21% in exhaled CO2, and 5% in the feces after 24 hours (ECHA. 1995a). These data suggest that l,l'-dimethyldiethylene glycol will be excreted from the body following exposure. 17 ------- *** Proposal Draft - Do Not Cite, Quote or Release During the Review*** 6.1.2 Acute Toxicity EPA assessed the potential for mammalian toxicity from acute exposure by l,r-dimethyldiethylene glycol using results from oral, inhalation, and dermal studies. Two studies on rats exposed to l,r-dimethyldiethylene glycol by oral gavage reported LD50S at very high doses, such as 12500 mg/kg and 16195 mg/kg respectively (Dow Chemical. 1994; Union Carbide. 1994). Another study in guinea pigs exposed to l,r-dimethyldiethylene glycol by oral gavage reported an LD50 of 10000 mg/kg (Union Carbide. 1994). These studies indicate low concern for acute toxicity with LD50S above the low-concern threshold of 2000 mg/kg for oral exposures. A study on rabbits exposed to dipropylene glycol dermally reported no adverse effects at the single dose tested (5010 mg/kg), resulting in an LD50 greater than 5010 mg/kg (ECHA. 1995c). Another study on rabbits exposed to tripropylene glycol dermally reported no adverse effects at the single dose tested, resulting in an LD50 greater than 16320 mg/kg (ECHA. 1974a). These studies indicate low concern for acute toxicity with LD50S above the low-concern threshold of 2000 mg/kg for dermal exposures. A study on rats exposed to a single concentration of tripropylene glycol in saturated vapor for eight hours and then observed for two weeks reported no mortalities (ECHA. 1974b). Based on tripropylene glycol's vapor pressure of 0.00195 torr, the expected air saturation concentration for tripropylene glycol is around 0.02 mg/L at room temperature, which is below the study concentration of 0.083 mg/L, indicating no adverse effects are expected at the complete air saturation concentration. Another study on rats exposed to a dipropylene glycol aerosol reported no adverse effects at the single dose tested, resulting in an LC50 greater than 2.34 mg/L (ECHA. 1995d). Considering the chemical's physical chemical properties (see Section 3) and available experimental data, these results indicate l,l'-dimethyldiethylene glycol is of low concern for acute toxicity from inhalation exposures based on no adverse effects reported at the expected air saturation. 6.1.3 Repeated Dose Toxicity EPA assessed the potential for mammalian toxicity from repeated exposures by 1,1'- dimethyldiethylene glycol using read-across from tripropylene glycol. In a combined repeated dose, reproductive, and developmental study (QECD. 1994: ECHA. 1993b). rats were exposed to tripropylene glycol via oral gavage for 49 days, beginning 14 days prior to mating and through lactation day 3 for females. The no observed adverse effect level (NOAEL) was 200 mg/kg-day and the lowest observed adverse effect level (LOAEL) was 1000 mg/kg-day based on changes in organ weight in parents. EPA also assessed the potential for toxicity from repeated exposures to dipropylene glycol in drinking water. A study on mice exposed to dipropylene glycol in drinking water for 13 weeks demonstrated a NOAEL of 2620 mg/kg-day and a LOAEL of 4790 mg/kg-day based on increased liver weight (ECHA. 2004g; NTP. 2004). A study on rats exposed to dipropylene glycol in drinking water for 14 weeks demonstrated a NOAEL of 425 mg/kg-day and a LOAEL of 890 mg/kg-day based on relative liver weight (ECHA. 2004f; NTP. 2004). A 2-year study on mice exposed to dipropylene glycol in drinking water demonstrated a NOAEL of 1040 mg/kg-day and a LOAEL of 1950 mg/kg-day based 18 ------- *** Proposal Draft - Do Not Cite, Quote or Release During the Review*** on decreased mean body weight (ECHA. 2004e; NTP. 2004). Another study on rats exposed to dipropylene glycol for 2 years in drinking water demonstrated aNOAEL of 115 mg/kg-day and a LOAEL of 470 mg/kg-day based on incidence of nephropathy, focal histiocytic and focal granulomatous inflammation in male livers (ECHA. 2004b. d; NTP. 2004). All of these analog results indicate low concern for toxicity resulting from repeated exposures by exceeding the oral low-concern threshold of 100 mg/kg-day for a 90-day study. 6.1.4 Reproductive and Developmental Toxicity EPA assessed the potential for reproductive toxicity using read-across from analog tripropylene glycol. In a combined repeated dose, reproductive, and developmental study, rats were exposed to tripropylene glycol via oral gavage for 49 days, beginning 14 days prior to mating and continuing through lactation day 3 for females. The authors reported no reproductive (mating, fertility, and estrus cycle) or developmental effects (external examinations of the pups and pup body weight gain) at the highest dose tested (1000 mg/kg-day). EPA determined the NOAEL for this study was 1000 mg/kg- day (OECD. 1994). These analog results indicate low concern for reproductive toxicity in the target chemical by exceeding the 250 mg/kg-day threshold. EPA further assessed the potential for developmental toxicity, using read-across from an analog, dipropylene glycol. A study on pregnant rats orally exposed to dipropylene glycol during GD 6-15 reported a developmental NOAEL of 2000 mg/kg-day and a LOAEL of 5000 mg/kg-day based on decreased fetal weight. A study on rabbits orally exposed to dipropylene glycol during GD 6-19 reported no adverse effects at the highest dose tested, resulting in aNOAEL of 1200 mg/kg-day (OECD. 2001; Bates et al.. 1992a; ECHA. 1990a). These analog results indicate low concern for developmental toxicity by exceeding the 250 mg/kg-day threshold. 6.1.5 Genotoxicity EPA assessed experimental studies on genotoxicity as a potential indicator of genotoxic carcinogenicity using read-across from dipropylene glycol. Three in vitro gene mutation studies resulted in negative findings from dipropylene glycol exposure with and without metabolic activation in Salmonella typhimiirium (ECHA. 2004c; NTP. 2004; ECHA. 1992a) and in mouse lymphoma cells (ECHA. 1988). Further, a mouse in vivo study indicated negative results for chromosomal aberrations in the form of micronucleated polychromatic erythrocytes from dipropylene glycol exposure (OECD. 2001; ECHA. 1999). These negative results in an analog indicate l,r-dimethyldiethylene glycol has low concern for inducing genotoxicity. 6.1.6 Carcinogenicity EPA assessed the potential for l,r-dimethyldiethylene glycol to cause carcinogenicity in mice and rats using read-across from dipropylene glycol. Rats exposed to dipropylene glycol in drinking water for 2 years demonstrated no dose-related effects on cancer incidence or cancer-related effects at the highest dose tested (3040 mg/kg-day in males, 2330 mg/kg-day in females), resulting in a negative finding for carcinogenicity (ECHA. 2004b; NTP. 2004). Similarly, mice exposed to dipropylene glycol in drinking water for two years also demonstrated no adverse effects at the highest dose tested (2390 mg/kg-day in males, 1950 mg/kg-day in females), resulting in a negative finding for 19 ------- *** Proposal Draft - Do Not Cite, Quote or Release During the Review*** carcinogenicity (ECHA. 2004a; NTP. 2004). Using read-across from this analog, these negative results indicate low concern for carcinogenicity for l,r-dimethyldiethylene glycol. 6.1.7 Neurotoxicity While no traditional neurotoxicity studies were available for l,r-dimethyldiethylene glycol or closely-related analogs, EPA assessed the potential for neurotoxicity using relevant endpoints measured in acute and repeated dose studies and using predictions made by U.S. EPA's ToxCast.29 Several repeat dose oral studies in rats and mice for analog tripropylene glycol reported no effects on the limited neurological endpoints that were evaluated (i.e., brain histopathology only). Tripropylene glycol did not produce histopathological lesions in the brain of rats at doses up to 1000 mg/kg-day (highest dose tested) in a study when males were exposed for 49 days and females were exposed from 14 days prior to mating until day 3 of lactation (OECD. 1994; ECHA. 1993b). Dipropylene glycol did not produce histopathological brain lesions in rats at oral doses up to 12,800 mg/kg-day for 3 months or up to 3040 mg/kg-day for 2 years. Similarly, in mice, no brain lesions were observed at oral doses up to 14700 mg/kg-day for 3 months or up to 2330 mg/kg-day for 2 years (ECHA. 2004b. d; NTP. 2004). A study on rats acutely exposed to dipropylene glycol by oral gavage noted decreased motor activity and ataxia for a few hours after exposure to the high dose of 5010 mg/kg, but the effects subsided by the first day of the observation period (ECHA. 1995e). ToxCast results for l,r-dimethyldiethylene glycol included 15 in vitro high throughput biochemical- and cell-based assays related to neurological functions.3" Bioactivity was not induced in any assay by l,r-dimethyldiethylene glycol. These data indicate there is low concern for neurotoxicity associated with l,r-dimethyldiethylene glycol. This finding is also supported by the low-hazard findings for other human health hazard endpoints, including, but not limited to, toxicity from acute exposures, reproductive toxicity, and developmental toxicity. 6.1.8 Skin Sensitization EPA assessed the potential for l,r-dimethyldiethylene glycol to cause skin sensitization using available experimental studies in an analog, dipropylene glycol. Dipropylene glycol demonstrated negative results in guinea pigs (ECHA. 1995k) and in two human studies (ECHA. 1995h; Johansen et al.. 1995; Leberco Labs. 1994). These negative analog results indicate low concern for skin sensitization for l,r-dimethyldiethylene glycol. 29 https://actor.epa.gov/dashboard/. Chemical specific assay list can be found at https://actor.epa.gOv/dashboard/#chemical/55934-93-5. M As identified by supplementary information from Chushak Y., Shows H., Gearhart J., Pangbum H. 2018. In silico identification of protein targets for chemical neurotoxins using Toxcast in vitro data and read-across within the QSAR toolbox. Toxicology Research issue 3. https://pubs.rsc.org/en/content/articlepdf/2018/tx/c7tx00268h Supplementary files: https://pubs.rsc.Org/en/content/articlelanding/2018/tx/c7tx00268h#idivAbstract 20 ------- *** Proposal Draft - Do Not Cite, Quote or Release During the Review*** 6.1.9 Skin Irritation EPA assessed the potential for dermal irritation using read-across from dipropylene glycol and tripropylene glycol. Three studies in rabbits demonstrated negative results for dermal irritation by dipropylene glycol (ECHA. 1995c. i; Leberco Labs. 1994). One study in rabbits demonstrated tripropylene glycol was minimally irritating with mean irritation score of 2 out of 10 (ECHA. 1974d). In another study, humans exposed to dipropylene glycol demonstrated mild erythema in 4 of the 33 subjects at the 24 hour scoring (ECHA. 1995f). However, humans exposed to tripropylene glycol for 24 hours reported negative results for skin irritation (ECHA. 1995b). A longer dermal patch study on humans exposed to tripropylene glycol for 14 days also indicated negative results for skin irritation (ECHA. 1997). Based on these results in analogs, l,r-dimethyldiethylene glycol is expected to be of low concern for skin irritation. 6.1.10 Eye Irritation To assess potential for eye irritation, EPA used read-across from two analogs, dipropylene glycol and tripropylene glycol. Rabbits exposed to tripropylene glycol displayed mild conjunctival redness, chemosis, and conjunctival discharge at the 1-hour scoring, but these results were fully reversible by 24 hours, leading to a negative result for eye irritation (ECHA. 2010a). Similarly, rabbits exposed to dipropylene glycol displayed conjunctival redness and a subset displayed chemosis after one hour, but again these results were fully reversible by 24 hours, leading to a negative result for eye irritation (ECHA. 1995g). These results are supported by two studies with negative results in rabbits exposed to dipropylene glycol (Leberco Labs. 1994) and tripropylene glycol (ECHA. 1974c). Additionally, an in vitro human corneal epithelium model study (ECHA. 2010b) also reported tripropylene glycol as negative for inducing ocular irritation. These in vivo and in vitro results in analogs indicate low concern for eye irritation by l,r-dimethyldiethylene glycol. 6.1.11 Hazards to Potentially Exposed or Susceptible Subpopulations The above information supports a low human health hazard finding for l,r-dimethyldiethylene glycol based on low-concern criteria. This finding includes considerations such as the potential for developmental toxicity, reproductive toxicity, and acute or repeated dose toxicity that may impact potentially exposed or susceptible subpopulations. Based on the hazard information discussed in Section 6, EPA did not identify populations with greater susceptibility to l,r-dimethyldiethylene glycol. 6.2 Environmental Hazard EPA assessed environmental hazard for l,r-dimethyldiethylene glycol based on estimated toxicity values using the Ecological Structure Active (ECOSAR) Predictive Model31 and available experimental data from two analogs, dipropylene glycol and tripropylene glycol. Appendix B contains a summary of the reasonably available environmental hazard data. 31https://www.epa.gov/tsca-screeniiig-tools/ecological-striicture-activitv-relationships-ecosar-predictive-model 21 ------- *** Proposal Draft - Do Not Cite, Quote or Release During the Review*** 6.2.1 Acute Aquatic Toxicity EPA assessed environmental hazard from acute exposures using read-across from tripropylene glycol and dipropylene glycol. No adverse effects were observed in aquatic invertebrates exposed to dipropylene glycol (ECHA. 2002. 1995i) or tripropylene glycol (ECHA. 2010c. 1994a; OECD. 1994) at the highest doses tested (100 mg/L and 1000 mg/L, respectively), resulting in LC50S greater than 100 mg/L and 1000 mg/L, respectively, for invertebrates. Similarly, no effects were observed in aquatic vertebrate or algae exposed to tripropylene glycol resulting in LC50S greater than 1000 mg/L for aquatic vertebrates (ECHA. 1994b; OECD. 1994) and algae (OECD. 1994). These aquatic toxicity studies indicate low concern for acute aquatic exposure by exceeding the low-concern threshold of 100 mg/L. 6.2.2 Chronic Aquatic Toxicity Chronic toxicity values estimated by ECOSAR for aquatic vertebrates, aquatic invertebrates, and algae were 1300 mg/L, 420 mg/L, and 370 mg/L, respectively. These toxicity values indicate that l,r-dimethyldiethylene glycol is expected to have low environmental hazard based on the low- concern criteria chronic aquatic toxicity threshold of 10 mg/L. 6.3 Persistence and Bioaccumulation Potential 6.3.1 Persistence Varied results are observed in the experimental ready test data presented in Appendix B. Due to the differences in the test conditions of the OECD ready test methods, some of this variability is likely a result of performance under different test designs rather than an inherent limitation of the biodegradability of the test substance. Given the varied results, EPA relied on studies from analogs tripropylene glycol and dipropylene glycol to make a weight of the scientific evidence conclusion. An explanation of ready and inherent biodegradation tests is provided below. Ready biodegradation tests are stringent test methods in which a high concentration of test substance is evaluated using a non-adapted inoculum. Passing this type of test indicates that a chemical is likely to biodegrade rapidly in the environment and has low potential for persistence. However, not passing the ready criteria is not necessarily an indication that a chemical is recalcitrant or that it will be persistent in the environment. In contrast, inherent biodegradability tests use more favorable conditions to promote a high expected capacity for degradation, including the use of prolonged exposure periods and a low ratio of test substance to inoculum biomass. Passing this type of test indicates that a substance is inherently biodegradable but does not provide evidence for ready biodegradation. The available data included tests for both ready biodegradation and inherent biodegradation. Tripropylene glycol was tested in three aerobic ready tests (OECD 301C, OECD 301B and OECD 30ID) that reported <5% degradation over 28-day incubation periods, indicating that it is not readily biodegradable (OECD. 1994; ECHA. 1993a. 1991b). However, in another OECD 30ID test, tripropylene glycol reached 69% O2 consumption after 28 days and just missed the 10-day window criterion at 59% in 11 days under aerobic conditions (ECHA. 1991a). In addition, both dipropylene glycol and tripropylene glycol reached S81% O2 consumption after 28 days under aerobic conditions 22 ------- *** Proposal Draft - Do Not Cite, Quote or Release During the Review*** in the OECD 301F test, meeting the criteria for ready biodegradation but not meeting the 10-day window (ECHA. 2007a. c, 1994c). These data suggest that tripropylene glycol is aerobically biodegradable and may be readily biodegradable under the right conditions. Results from additional aerobic studies, including the inherent biodegradability test OECD 302A and a seawater biodegradability test (OECD 306) on dipropylene glycol provide further support that tripropylene glycol has the capacity to biodegrade under environmental conditions (ECHA. 2007d. 1994c). Furthermore, the microbial inhibition tests on tripropylene glycol and dipropylene glycol indicate that these substances are non-toxic to microbial populations found in sewage treatment plants (ECHA. 2010c. 1992b). Based on the weight of scientific evidence, the data suggest l,r-dimethyldiethylene glycol is expected to biodegrade under aerobic conditions. Although under some test conditions this chemical may not meet the benchmark for ready biodegradation, both ready and inherent biodegradation of these substances has been demonstrated using a variety of standard and non-standard test methods. No quality experimental studies were available to assess anaerobic biodegradation. Though BIOWIN modeling did not predict this chemical to anaerobically biodegrade quickly, these results do not indicate this chemical would not anaerobically biodegrade. ri-Dimethyldiethylene glycol's low- hazard results for environmental and mammalian toxicity, and evidence of aerobic biodegradation, indicate low concern for this chemical if present in anaerobic environments. No degradation products of concern were identified for this chemical substance. The available biodegradation results meet the low-concern threshold and indicate this chemical will have low persistence. 6.3.2 Bioaccumulation Potential Based on the estimated bioaccumulation factor (BAF) value of 0.9 using the Estimation Programs Interface (EPI) Suite models,32 l,r-dimethyldiethylene glycol is expected to have low potential for bioaccumulation in the environment based on the low concern threshold of less than 1000. 32 https://www.epa.gov/tsca-screeniiig-tools/epi-suite1m-estimation-program-mterface 23 ------- *** Proposal Draft - Do Not Cite, Quote or Release During the Review*** 7. Exposure Characterization EPA considered reasonably available information on exposure for l,r-dimethyldiethylene glycol. In general, there is limited information on exposure for low-hazard chemicals. EPA determined the CDR database and certain other sources of l,r-dimethyldiethylene glycol use information are sources of information relevant to l,r-dimethyldiethylene glycol's exposure potential. Of these sources, EPA determined that the CDR database contained the primary source of information on the conditions of use for this exposure characterization. EPA also consulted sources of use information from other databases and public sources (listed in Table A.2). EPA used these sources only where they augmented information from the CDR database to inform intended, known, or reasonably foreseen uses (Section 5). As shown in Tables 3 and A.3, l,r-dimethyldiethylene glycol is used in processing (incorporation into formulation, mixture or reaction) for plastics product manufacturing, detergents, cleaning compounds, and toilet preparation manufacturing. It is also used in industrial applications, such as construction and building materials, and consumer and commercial applications including air care products; cleaning and furnishing care products; laundry and dishwashing products; plastic and rubber products; arts and crafts; and toys, among others. l,r-Dimethyldiethylene glycol may have other uses, as shown in Table 3. Non-TSCA uses, including those because of the excluded under TSCA section 3(2), are beyond the scope of this assessment (See Table A.3). Under the conditions of use identified in Table 3, EPA assessed the potential exposure to the following categories: the environment, the general population, and potentially exposed or susceptible subpopulations including workers, consumers, and infants and children. 7.1 Production Volume Information Production volume information for l,r-dimethyldiethylene glycol is based on an analysis of CDR data reported from 1986 to 2015.33 In the 1986 reporting year, aggregate production volume for 1.1'- dimethyldiethylene glycol was between 1,000,000 and 10,000,000 lbs. and in 1990, between 50,000,000 and 100,000,000 lbs. From the 1994 to 2002 reporting years, aggregate production volume for l,r-dimethyldiethylene glycol was between 10,000 and 500,000 lbs., and for the 2011 reporting year, the exact amount is available, at 146,990 lbs. Production reached a high of 1,000,000 to <10,000,000 lbs. in 2012; however, it has remained stable within the range of 500,000 to <1,000,000 lbs. from 2013-2015. 7.2 Exposures to the Environment EPA expects most exposures to the environment to occur during the manufacture, import, processing, and industrial, commercial, and consumer uses of l,r-dimethyldiethylene glycol. Exposure is also reasonably foreseen from other conditions of use, such as distribution and disposal. These activities 33 The CDR requires manufacturers (including importers) to report information on the chemical substances they produce domestically or import into the U.S above 25,000 lb. per site per year. 24 ------- *** Proposal Draft - Do Not Cite, Quote or Release During the Review*** could result in releases of l,r-dimethyldiethylene glycol to media including surface water, landfills, and air. EPA expects high levels of removal of l,r-dimethyldiethylene glycol during wastewater treatment (either directly from the facility or indirectly via discharge to a municipal treatment facility or Publicly Owned Treatment Works (POTW)). Further, l,r-dimethyldiethylene glycol is expected to have low persistence (aerobic biodegradation is discussed in Section 6.3.1) and has the potential to break down in the environment into carbon dioxide and water. Therefore, any release of this chemical is expected to break down, reducing exposure to aquatic organisms in the water column and groundwater sources of drinking water, including well water. Based on the estimated log Koc (Table 2 of Section 3), l,r-dimethyldiethylene glycol is expected to have negligible adsorption to sediment, reducing the potential for toxicity to benthic organisms. Further, l,r-dimethyldiethylene glycol's biodegradability during treatment processes will reduce the exposure potential to aquatic organisms. If disposed of in a landfill, this chemical is expected to degrade under aerobic conditions (aerobic biodegradation is discussed in Section 6.3.1). If incineration releases during manufacturing and processing occur, EPA expects significant degradation of l,r-dimethyldiethylene glycol to the point that it will not be present in air. 7.3 Exposures to the General Population EPA expects the general population is unlikely to be exposed to l,r-dimethyldiethylene glycol from the potential environmental releases described above. Air exposure is unlikely from incineration. If l,rdiemthyldiethylene glycol is present in the air from volatilization, it is expected to be reduced because of its short atmospheric half-life of about 4 hours (see Table 2 in Section 3). With the exception of time immediately following a release, l,rdimethyldiethylene glycol is unlikely to be present in surface water because it will degrade (discussed in Section 6.3.1), reducing the potential for the general population to be exposed by oral ingestion or dermal exposure. Further, given the low bioaccumulation or bioconcentration potential of l,r-dimethyldiethylene glycol, oral exposure to l,r-dimethyldiethylene glycol via fish ingestion is unlikely. 7.4 Exposures to Potentially Exposed or Susceptible Subpopulations EPA identified workers, consumers, and infants and children as potentially exposed or susceptible subpopulations based on greater exposure to l,r-dimethyldiethylene glycol than the general population during manufacturing, processing, distribution, use and disposal. EPA identified infants and children (including any adults working closely with them) as a population that may experience greater exposure to l,r-dimethyldiethylene glycol than the general population during use of hobby products, toys, and baby mattresses and pillows. EPA also identified consumers as a population that may experience greater exposure to l,r-dimethyldiethylene glycol than the general population through use of printing inks, cleaning and furnishing care products, laundry and dishwashing products, air care products, and decor candles, for example. 25 ------- *** Proposal Draft - Do Not Cite, Quote or Release During the Review*** 7.4.1 Exposures to Workers Based on its reported physical form and measured melting point (Table 2), l,r-dimethyldiethylene glycol is a liquid under ambient conditions. Based on l,r-dimethyldiethylene glycol's conditions of use, workers may be exposed to liquids through direct dermal contact with the substance and inhalation of aerosols if they are generated. Based on its measured vapor pressure (Table 2), 1,1'- dimethyldiethylene glycol is expected to be volatile at ambient temperatures, and therefore workers may be exposed through inhalation of vapors. If l,l'-dimethyldiethylene glycol is in a dilute form, the estimated Henry's Law constant for l,l'-dimethyldiethylene glycol suggests volatilization from water and aqueous solutions is expected to be minimal. Workers may be exposed to 1,1'- dimethyldiethylene glycol in manufacturing, processing, distribution, use, and disposal. 7.4.2 Exposures to Consumers Consumers could be exposed to l,l'-dimethyldiethylene glycol through use of printing inks, cleaning and furnishing care products, laundry and dishwashing products, air care products, decor candles, and other products. For all these uses, if dermal contact does occur, l,l'-dimethyldiethylene glycol is expected to have minimal absorption through the skin based on its molecular weight, water solubility and partitioning coefficients (Section 3) and experimental data (Section 6.1.1). If the chemical is in an aerosol product and inhalation exposure occurs, l,l'-dimethyldiethylene glycol's absorption from the lungs is likely. EPA does not include intentional misuse, such as people drinking products containing this chemical, as part of the known, intended or reasonably foreseen conditions of use that could lead to an exposure (82 FR 33726). Thus, oral exposures will be incidental (meaning inadvertent and low in volume). l,l'-Dimethyldiethylene glycol is expected to be rapidly metabolized and excreted, further reducing the duration of exposure. 7.4.3 Exposures to Infants and Children Children may be potentially exposed to l,l'-dimethyldiethylene glycol through the use of hobby products, such as marker pens and toys, as noted in Table 3 (CPCat, 2019). In 2006, the Danish Environmental Protection Agency conducted a survey of the following types of children's hobby products: marker pens, glitter glue, acrylic paint, and shrink plastic. The initial screening detected over 70 chemicals, with l,l'-dimethyldiethylene glycol detected in 3 of 26 marker pens; the chemical was not found in the other types of hobby products. The Danish EPA prioritized quantifying chemicals associated with hazardous effects, such as carcinogens, mutagens, and reproductive toxicants and allergenic substances. The amount of l,l'-dimethyldiethylene glycol in the marker pens was not quantitatively analyzed because of its low-concern for hazard (Danish EPA, 2008a). In a survey conducted from 2013 to 2014 on children's toys by the Danish EPA, l,l'-dimethyldiethylene glycol was detected in toy slime (at 5 mg/kg) but no other types of toys (Danish EPA, 2015) As noted in Table 3 (CPCat, 2019), infants may also be exposed to l,l'-dimethyldiethylene glycol via baby products. A 2008 survey by the Danish EPA investigated chemicals in the following types of baby products: pillows for baby feeding; baby carriers; nursing pillows and cushions with different covers and stuffing; baby mattresses with foam stuffing; aprons to perambulators; and disposable foam washcloths. l,l'-Dimethyldiethylene glycol was detected in the foam of a baby mattress (at 56 |ig/g) and the outer cover (cotton with printing) of a pillow for baby feeding (at 19 jxg/g); the 26 ------- *** Proposal Draft - Do Not Cite, Quote or Release During the Review*** chemical was not detected in any of the other type of baby products investigated (Danish EPA, 2008b). When children use marker pens and slime, skin contact is likely. When infants are placed on pillows for baby feeding, skin contact with l,r-dimethyldiethylene glycol is possible if the chemical is present in the outer cover. The same is true for baby mattresses if l,r-dimethyldiethylene glycol migrates from the foam to the surface. However, l,r-dimethyldiethylene glycol is expected to be poorly absorbed through the skin given its molecular weight, water solubility, and partitioning coefficients (Section 3) and experimental evidence on analogs (6.1.1). Based on the predicted Henry's Law constant (Section 3), l,r-dimethyldiethylene glycol's volatilization from water and aqueous solutions is expected to be minimal, which is relevant for marker pens and toy slime, reducing inhalation exposures to children. While using these products, children may rub their eyes or incidentally ingest the product. Similarly, when infants are placed on baby mattresses or pillows for feedings, they may orally ingest the chemical if mouthing these products or sucking their fingers. If ingested, l,l'-dimethyldiethylene glycol is expected to be rapidly metabolized and excreted, further reducing the duration of exposure. Therefore, EPA expects the exposures to l,l'-dimethyldiethylene glycol through use of these products to be low. EPA did not find information on the presence or concentration of l,l'-dimethyldiethylene glycol in children's and baby products from sources beyond this Danish EPA study. EPA assumes that the hobby products, toys, baby mattresses, and pillows used for feeding tested by the Danish EPA are similar to products sold in the U.S., or that similar products and uses are reasonably foreseeable. 7.5 References Danish EPA. (2008a). Survey and health assessment of chemical substances in hobby products for children. Retrieved from https://www2.mst.dk/udgiv/publications/2008/978-87-7052-763- 7/pdf/978-87-7052-764-4.pdf Danish EPA. (2008b). Survey, emission and health assessment of chemical substances in baby products https://www2.mst.dk/udgiv/publications/2008/978-87-7052-717-0/pdf/978-87-7052- 718-7.pdf Danish EPA. (2015). CMR Substances in Toys - Market Surveillance and Risk Assessment. Retrieved from https://www2.mst.dk/Udgiv/publications/2015/10/978-87-93352-79-7.pdf 27 ------- *** Proposal Draft - Do Not Cite, Quote or Release During the Review*** 8. Summary of Findings EPA has used reasonably available information on the following statutory and regulatory criteria and considerations to screen l,r-dimethyldiethylene glycol against each of the priority designation considerations in 40 CFR 702.9(a), discussed individually in this section, under its conditions of use: • the hazard and exposure potential of the chemical substance (See Sections 6 and 7); • persistence and bioaccumulation (See Section 6.3); • potentially exposed or susceptible subpopulations (See Section 7.4); • storage near significant sources of drinking water (See Section 8.4); • conditions of use or significant changes in the conditions of use of the chemical substance (See Section 5); • the chemical substance's production volume or significant changes in production volume (See Section 7.1); and • other risk-based criteria that EPA determines to be relevant to the designation of the chemical substance's priority. EPA conducted a risk-based screening-level review based on the criteria and other considerations above and other relevant information described in 40 CFR 702.9(c) to inform the determination of whether the substance meets the standard of a high-priority substance. High-priority substance means a chemical substance that EPA determines, without consideration of costs or other non-risk factors, may present an unreasonable risk of injury to health or the environment because of a potential hazard and a potential route of exposure under the conditions of use, including an unreasonable risk to potentially exposed or susceptible subpopulations identified as relevant by EPA (40 CFR 702.3). This section explains the basis for the proposed designation and how EPA applied statutory and regulatory requirements, addressed rationales and reached conclusions. 8.1 Hazard and Exposure Potential of the Chemical Substance Approach: EPA evaluated the hazard and exposure potential of l,l'-dimethyldiethylene glycol. EPA used this information to inform its proposed determination of whether l,l'-dimethyldiethylene glycol would meet the statutory criteria and considerations for proposed designation as a low-priority substance. • Hazard potential: For l,l'-dimethyldiethylene glycol's hazard profile, EPA gathered information for abroad set of human health and environmental endpoints described in detail in Section 6 of this document. EPA benchmarked this information against the low-concern thresholds. EPA found that 1,1'- dimethyldiethylene glycol is of low concern for human health and environmental hazard across the range of endpoints in this low-concern criteria. • Exposure potential: 28 ------- *** Proposal Draft - Do Not Cite, Quote or Release During the Review*** To understand exposure potential, EPA gathered information on physical-chemical properties, production volumes, and the types of exposures likely to be faced by workers, the general population, consumers, and infants and children (discussed in Sections 3 and 7). EPA also gathered information on environmental releases. EPA identified workers, the general population, consumers, infants and children, and the environment as most likely to experience exposures. EPA determined that while the general population, consumers, children and workers may be exposed to l,r-dimethyldiethylene glycol, exposure by the dermal pathway is limited by l,r-dimethyldiethylene glycol's physical- chemical properties. If ingestion occurs, l,r-dimethyldiethylene glycol is expected to be metabolized and excreted, reducing the duration of exposure. Inhalation of l,r-dimethyldiethylene glycol in dilute products is expected to be minimal; however, workers may be exposed to vapors of neat l,rdiemthyldiethylene glycol. If l,r-dimethyldiethylene glycol is released into the environment, its exposure potential will be reduced through biodegradation under aerobic conditions. EPA found that l,r-dimethyldiethylene glycol is of low concern for human and environmental exposure given the low hazard nature of this chemical substance. Rationale: EPA determined that while workers, consumers, and infants and children may be exposed to l,r-dimethyldiethylene glycol during processing, manufacturing, distribution, use, or disposal, these exposures do not pose a significant risk because of the chemical's low-hazard results across a range of endpoints (discussed in Section 6). In summary, the concern for exposure is mitigated by the low-hazard profile of this chemical. Proposed conclusion: Based on an initial analysis of reasonably available hazard and exposure information, EPA proposes to conclude that the risk-based screening level review under 40 CFR 702.9(a)(1) does not support a finding that l,l'-dimethyldiethylene glycol meets the standard for a high-priority substance. The reasonably available hazard and exposure information described above provides sufficient information to support this proposed finding. 8.2 Persistence and Bioaccumulation Approach: EPA has evaluated both the persistence and bioaccumulation potential of 1,1'- dimethyldiethylene glycol based on a set of EPA and internationally accepted measurement tools and thresholds that are indicators of persistence and bioaccumulation potential (described in Section 6). These endpoints are key components in evaluating a chemical's persistence and bioaccumulation potential. Rationale: As discussed in Section 6.3.1, EPA predicts l,l'-dimethyldiethylene glycol will have a half-life less than 60 days. Given the low toxicity concern for this chemical, the low-concern criteria require that the chemical not produce degradation products of concern and have a half-life less than 60 days (Section 6.3.1). The available biodegradation results meet the low concern threshold and suggest this chemical has low potential for persistence. Additionally, EPA's EPI Suite models indicate alow potential for bioaccumulation (Section 6.3.2). Proposed conclusion: Based on an initial screen of reasonably available information on persistence and bioaccumulation, EPA proposes to conclude that the screening-level review under 40 CFR 702.9(a)(2) does not support a finding that l,l'-dimethyldiethylene glycol meets the standard for a 29 ------- *** Proposal Draft - Do Not Cite, Quote or Release During the Review*** high-priority substance. The reasonably available persistence and bioaccumulation information described above provides sufficient information to support this proposed finding. 8.3 Potentially Exposed or Susceptible Subpopulations Approach: TSCA Section 3(12) states that the "term 'potentially exposed or susceptible subpopulation' means a group of individuals within the general population identified by the Administrator who, due to either greater susceptibility or greater exposure, may be at greater risk than the general population of adverse health effects from exposure to a chemical substance or mixture, such as infants, children, pregnant women, workers, or the elderly." EPA identified workers engaged in the manufacturing, processing, distribution, and disposal of l,r-dimethyldiethylene glycol, as well as consumers, infants and children, as potentially exposed or susceptible subpopulations (described in more detail in Section 7). EPA also identified infants and children (and any adults working closely with children) as a population that may experience greater exposure to l,r-dimethyldiethylene glycol than the general population during use of hobby materials such as marker pens, toys such as toy slime, and baby mattresses and pillows. Consumers are also a potentially exposed subpopulation because of their use of products such as printing inks, cleaning and furnishing care products, laundry and dishwashing products, air care products, decor candles, and other products. Rationale: EPA did not identify hazard effects for this chemical that would make any population susceptible. EPA expects workers, consumers, and infants and children to have a higher exposure to l,r-dimethyldiethylene glycol than the general population. Higher exposure to children could result from use of products such as marker pens and toy slime containing l,r-dimethyldiethylene glycol, which might lead to inadvertent eye contact. Similarly, infants may have higher exposure to 1.1- dimethyldiethylene glycol, and inadvertent eye contact with the chemical, from use of baby mattresses and pillows. Children and infants could also be exposed to l,r-dimethyldiethylene glycol via ingestion while using or teething these products. Because of the chemical's low-concern hazard properties, this exposure does not pose a significant increase in risk for children and infants. Proposed conclusion: Based on the Agency's understanding of the conditions of use and expected users such as potentially exposed or susceptible subpopulations, EPA proposes to conclude that the screening-level review under 40 CFR 702.9(a)(3) does not support a finding that 1,1'- dimethyldiethylene meets the standard for a high-priority substance. While the conditions of use will result in an increase in exposures to certain populations, the consistently low-concern hazard profile of l,l'-dimethyldiethylene glycol provides sufficient evidence to support a finding of low concern. The reasonably available information on conditions of use, hazard, and exposure described above provides sufficient information to support this proposed finding. 8.4 Storage near Significant Sources of Drinking Water Approach: In Sections 6 and 7, EPA explains its evaluation of the elements of risk relevant to the storage of l,l'-dimethyldiethylene glycol near significant sources of drinking water. Forthis criterion, EPA focused primarily on the chemical substance's potential human health hazards, including to potentially exposed or susceptible subpopulations, and environmental fate properties, and explored a scenario of a release to a drinking water source. EPA also investigated whether the chemical was monitored for and detected in a range of environmental media. The requirement to 30 ------- *** Proposal Draft - Do Not Cite, Quote or Release During the Review*** consider storage near significant sources of drinking water is unique to prioritization under TSCA Section 6(b)(1)(A). Rationale: In terms of health hazards, l,r-dimethyldiethylene glycol is expected to present low concern to the general population, including susceptible subpopulations, across a spectrum of health endpoints. In the event of an accidental release into a surface drinking water source, l,r-dimethyldiethylene glycol is expected to be water soluble (see Section 3) and not expected to persist (see Section 6) in the drinking water supply. In the event of an accidental release to land, the estimated log Koc indicates this substance is highly mobile in soils, increasing its potential for leaching into groundwater, including well water. The fate and transport evaluation indicates l,r-dimethyldiethylene glycol is unlikely to partition into sediment, predicted to biodegrade under aerobic conditions (see Section 3), and unlikely to bioaccumulate (see Section 6), minimizing the likelihood that the chemical would be present in sediment or groundwater to pose a longer-term drinking water contamination threat. Further, as explained in Section 6.1.3, repeated exposures of mice and rats to dipropylene glycol, a closely-related analog, through the drinking water exposure pathway indicate low concern for exposure through drinking water to this chemical. A sudden release of large quantities of the chemical near a drinking water source could have immediate effects on the usability of a surface drinking water source. If such a release were to occur, two primary factors would operate together to reduce concern. First, the chemical would be expected to present low concern to the general population, including susceptible subpopulations, across a spectrum of health endpoints (see Section 6). Second, l,r-dimethyldiethylene glycol would degrade in aerobic environments (see Section 6). Together, these factors mean that any exposures to this chemical through drinking water sources would be short-lived, and that if ingestion were to take place, concern for adverse health effects would be low. EPA also explored whether the chemical had been identified as a concern under U.S. environmental statutes in the past. EPA searched lists of chemicals and confirmed that l,r-dimethyldiethylene glycol does not appear on these lists. The lists reviewed include EPA's List of Lists (https://www.epa.gov/sites/production/files/2015-03/documents/list of lists.pdf). EPA also searched the lists of chemicals included in the National Primary Drinking Water Regulations and the Unregulated Contaminant Monitoring Rule (UCMR) under the Safe Drinking Water Act (SDWA). Proposed conclusion: Based on a qualitative review of a potential release near a significant source of drinking water, EPA proposes to conclude that the screening-level review under 40 CFR 702.9(a)(4) does not support a finding that l,r-dimethyldiethylene glycol meets the standard for a high-priority substance. The reasonably available information on storage near significant sources of drinking water described above provides sufficient information to support these proposed findings. 31 ------- *** Proposal Draft - Do Not Cite, Quote or Release During the Review*** 8.5 Conditions of Use or Significant Changes in Conditions of Use of the Chemical Substance Approach: EPA evaluated the conditions of use for l,r-dimethyldiethylene glycol and related potential exposures and hazards. Rationale: EPA evaluated the conditions of use of l,r-dimethyldiethylene glycol (see Section 5 and Appendix A) and found it to have a broad range of conditions of use. EPA expects that even if the conditions of use were to expand beyond activities that are known, intended, or reasonably foreseen, the outcome of the screening review would likely not change and would not alter the Agency's conclusion of low concern. EPA bases this expectation on 1,1'- dimethyldiethylene glycol's consistently low-concern hazard characteristics across the spectrum of hazard endpoints and regardless of a change in the nature or extent of its use and resultant increased exposures. Proposed conclusion: EPA's qualitative evaluation of potential risk does not support a finding that l,l'-dimethyldiethylene glycol meets the standard for a high-priority substance, based on its low- hazard profile under the current conditions of use. EPA proposes to find that even if conditions of use broaden, resulting in an increase in the frequency or amount of exposures, the analysis conducted to support the screening-level review under 40 CFR 702.9(a)(5) would not change significantly. In particular, the analysis of concern for hazard, which forms an important basis for EPA's findings, would not be impacted by a change in conditions of use. Therefore, such changes would not support a finding that l,l'-dimethyldiethylene glycol meets the standard for a high-priority substance. The reasonably available information on conditions of use or significant changes in conditions of use described above provides sufficient information to support this proposed finding. 8.6 The Volume or Significant Changes in Volume of the Chemical Substance Manufactured or Processed Approach: EPA evaluated the current production volumes of l,l'-dimethyldiethylene glycol (Section 7.1) and related potential exposures (Sections 7.2 through 7.4). Rationale: EPA used reasonably available information on production volume (see Appendix A) in considering potential risk. It is possible that designation of l,l'-dimethyldiethylene glycol as a low- priority substance could result in increased use and higher production volumes. EPA expects, however, that any changes in l,l'-dimethyldiethylene glycol's production volume would not alter the Agency's assessment of low concern given the chemical's low-hazard profile. EPA bases this expectation on l,l'-dimethyldiethylene glycol's consistently low-concern hazard characteristics across the spectrum of hazard endpoints. This expectation would apply, even with a significant change in the volume of the chemical manufactured or processed and resultant increased exposures. Proposed conclusion: Based on this screening criteria under 40 CFR 702.9(a)(6), EPA proposes to find that even if production volumes increase, resulting in an increase in the frequency or level of exposure, l,l'-dimethyldiethylene glycol does not meet the standard for a high-priority substance. 32 ------- *** Proposal Draft - Do Not Cite, Quote or Release During the Review*** The reasonably available information on production volume or significant changes in production volume described above provides sufficient information to support this proposed finding. 8.7 Other Considerations EPA did not identify other considerations for the screening review to support the proposed designation of l,r-dimethyldiethylene glycol as a low-priority substance. 33 ------- *** Proposal Draft - Do Not Cite, Quote or Release During the Review*** 9. Proposed Designation Based on a risk-based screening-level review of the chemical substance and, when applicable, relevant information received from the public and other information as appropriate and consistent with TSCA section 26(h) and (i), EPA is proposing to designate l,r-dimethyldiethylene glycol as a low-priority substance as it does not meet the statutory criteria for a high-priority substance. 34 ------- *** Proposal Draft - Do Not Cite, Quote or Release During the Review*** Appendix A: Conditions of Use Characterization EPA gathered information on and related to conditions of use including uses of the chemical, products in which the chemical is used, types of users, and status (e.g., known, regulated). A.1 CDR Manufacturers and Production Volume The Chemical Data Reporting (CDR) rule (previously known as the Inventory Update Rule, or IUR), under TSCA section 8, requires manufacturers (including importers) to report information on the chemical substances they produce domestically or import into the U.S., generally above a reporting threshold of 25,000 lb. per site per year. According to the 2016 CDR database, 2 companies manufactured or imported l,r-dimethyldiethylene glycol at 3 sites for reporting year 2015. Table A.l presents the historic production volume of l,r-dimethyldiethylene glycol from the CDR from 1986-2015. In the 1986 reporting year, aggregate production volume for 1.1'- dimethyldiethylene glycol was between 1,000,000 and 10,000,000 lbs. and in 1990, between 50,000,000 and 100,000,000 lbs. From the 1994 to 2002 reporting years, aggregate production volume for l,rdimethyldiethylene glycol was between 10,000 and 500,000 lbs., and for the 2011 reporting year, the exact amount is available, at 146,990 lbs. Production reached a high of 1,000,000 - <10,000,000 lbs. in 2012, however has remained stable within the range of 500,000 - <1,000,000 lbs. from 2013-2015. Table A.1:1986-2015 National Production Volume Data for 1,1'Dimethyldiethylene Glycol (Non-Confidential Production Volume in Pounds) 1986 1990 1994 1998 2002 2006 2011 2012 2013 2014 2015 1M- 10M 50M- 100M 10K- 500 K 10K- 500 K 10K- 500 K 1M- 10M 146,990 Withheld 500K- <1M 500K- <1M 500K- <1M Source(s): EPA (2018a: 2017b: 2006: 2002): Sherlock (2019) Note(s): K = Thousands; M = : Million I ------- *** Proposal Draft - Do Not Cite, Quote or Release During the Review*** A.2 Uses A.2.1 Methods for Uses Table Section A.l provides a list of known uses of l,r-dimethyldiethylene glycol, organized by category of use. To compile the uses, EPA searched publicly available databases listed in Table A.2 and conducted additional Google searches to clarify uses. Search terms differed among databases because of different search term requirements for each database (i.e., some databases search by CASRN while others search by chemical name). Table A.2: Sources Searched for Uses of 1,1'Dimethyldiethylene Glycol Title Author and Year Search Term(s) Found Use Information?1 Sources searched for all use reports California Links to Pesticides Data California Dept of Pesticide Regulation (2013) 110-98-5 No Canada Chemicals Management Plan information sheets Government of Canada (2018) 1,1'dimethyldiethylene glycol; 1,1'-oxydi-2- propanol No Chemical and Product Categories (CPCat) CPCat (2019) 110-98-5 Yes ChemView2 EPA (2018a) 110-98-5 Yes Children's Safe Product Act Reported Data Washington State Dept. of Ecology (2018) 110-98-5 No Consumer Product Information Database (CPID) DeLima Associates (2018) 110-98-5 Yes Danish surveys on chemicals in consumer products Danish EPA (2018) N/A, there is no search, but report titles were checked for possible information on the chemical No Datamyne Descartes Datamyne (2018) 1,1'dimethyldiethylene glycol; 1,1'-oxydi-2- propanol No DrugBank DrugBank (2018b) 110-98-5 No European Chemicals Agency (ECHA) Registration Dossier ECHA (2018a; 2018b) 110-98-5 No eChemPortal2 OECD (2018) 110-98-5 No Envirofacts2 EPA (2018b) 110-98-5 No Functional Use Database (FUse) EPA (2017a) 110-98-5 Yes Kirk-Othmer Encyclopedia of Chemical Technology Kirk-Othmer (2006) 1,1'dimethyldiethylene glycol; 1,1'-oxydi-2- propanol No II ------- *** Proposal Draft - Do Not Cite, Quote or Release During the Review*** Table A.2: Sources Searched for Uses of 1,1'Dimethyldiethylene Glycol Title Author and Year Search Term(s) Found Use Information? 1 Non-Confidential 2016 Chemical Data Reporting EPA (2017b) 110-98-5 Yes (CDR) PubChem Compound Kimetal. (2016) 110-98-5 Yes Safer Chemical Ingredients List (SCIL) EPA (2018d) 110-98-5 Yes Synapse Information Synapse Information 1,1'dimethyldiethylene Yes Resources2 Resources (2009) glycol Resource Conservation and Recovery Act (RCRA) EPA (2018c) 1,1'dimethyldiethylene glycol; 1,1'-oxydi-2- propanol No Scorecard: The Pollution Information Site GoodGuide (2011b) 110-98-5 No Uses for CAS RN 110-98-5, with the chemical name listed as "Dipropylene Glycol." EWG did not have search results Skin Deep Cosmetics EWG (2018a, 2018b) for CAS RN 25265-71-8 or "1,1'dimethyldiethylene glycol." Database The uses are listed in Table 3-4 as they are unable to be specifically listed as a use under dipropylene glycol or 1,1'dimethyldiethylene glycol. Toxics Release Inventory (TRI) EPA (2018e) 110-98-5 No TOXNET 2 NLM (2018a) 110-98-5 Yes Ullmann's Encyclopedia of Industrial Chemistry Ullmann's (2000) 1,1'dimethyldiethylene glycol; 1,1'-oxydi-2- propanol No Additional Sources Identified from Reasonably Available Information Boscia Boscia (2018) Cetaphil Cetaphil (2018) CVS CVS (2018) Dove Dove (2018) The Dow Chemical Company Dow (2009) Incidentally identified while researching details of this Medline Medline.com (2009) National Archives and National Archives and Records Administration (2018) Yes Records Information chemical's uses and products. National Pesticide Information Retrieval NPIRS (2018) System (NPIRS) Neutrogena Neutrogena (2018a) Shiseido Shiseido (2018) Skinfood Skinfood (2018) III ------- *** Proposal Draft - Do Not Cite, Quote or Release During the Review*** Table A.2: Sources Searched for Uses of 1,1'Dimethyldiethylene Glycol Title | Author and Year | Search Term(s) | Found Use Information? 1 Note(s): 1. If use information was found in the resource, it will appear in Table A.3 unless otherwise noted. 2. This source is a group of databases; thus the exact resource(s) it led to will be cited instead of the database as whole. The U.S. Patent and Trademark Office has an online database that shows no patents referencing ""I.I 'dimcthyldiethylenc glycol" (USPTO 2018b). Although patents could be useful in determining reasonably foreseen uses, it is difficult to confirm whether any of the patented technologies are currently in use. Uses inferred from patents containing l,rdimethyldiethylene glycol were not included in Table A.3. Note that the uses in Table A.3 that are covered under TSCA are included in Section 5, Table 3 of this document. IV ------- *** Proposal Draft - Do Not Cite, Quote or Release During the Review*** A.2.2 Uses of 1,1'-Dimethyldiethylene Glycol Table A.3: Uses of 1,1'-Dimethyldiethylene Glycol Use Expected Users Description of Use and References TSCA Conditions of Use: Automotive and Engine CPCat (2019) Automotive care Industrial CPCat lists the use of 1,1'dimethyldiethylene glycol in the "maintenance and repairs of motor vehicles" and in polishing agents for automotive lacquers (car wax). CPCat also lists use in automotive care paints. Expected users are industrial based on CPCat's user classification. CPCat (2019) Automotive fuel Industrial CPCat lists the use of 1,1'dimethyldiethylene glycol in the "retail sale of automotive fuel in specialized stores." Expected users are industrial based on CPCat's user classification. CPCat (2019) Automotive manufacturing Industrial CPCat lists the use of 1,1'dimethyldiethylene glycol in the "manufacture of motor vehicles, trailers and semi-trailers." Expected users are industrial based on CPCat's user classification. Synapse Information Resources (2009) Hydraulic brake fluid Unknown Synapse Information Resources lists the use of 1,1'dimethyldiethylene glycol as a solvent in hydraulic brake fluid. CPCat (2019) Windscreen washing agents Unknown CPCat lists the use of 1,1'dimethyldiethylene glycol in automotive windscreen and window care washing agents. Expected users are unknown, due to the limited availability of information. v ------- *** Proposal Draft - Do Not Cite, Quote or Release During the Review*** Table A.3: Uses of 1,1'-Dimethyldiethylene Glycol Use Expected Users Description of Use and References TSCA Conditions of Use: Cleaning and Maintenance Products EPA (2017b); CPCat (2019); Zep Inc (2015) Air care products Consumer, commercial CDR shows the use of 1,1'dimethyldiethylene glycol in air care products at concentrations of at least 90 percent by weight. CPCat lists the use of 1,1'dimethyldiethylene glycol in "air cleaners and anti-odor agents (not filters)." 1,1'dimethyldiethylene glycol is listed as an ingredient in an air sanitizer product currently available for consumer and commercial use. Expected users are based on CDR's consumer/commercial classification. EPA (2017b); CPCat (2019) Cleaning and furnishing care products Consumer, commercial CDR shows the use of 1,1'dimethyldiethylene glycol in cleaning and furnishing care products, further information on exact uses were not reported to CDR. CDR reported concentrations in these products of at least 1 percent but less than 30 percent by weight. CPCat lists the use of 1,1'dimethyldiethylene glycol in cleaning and washing agents, including industrial cleaning activities. Expected users are based on CDR's consumer/commercial classification. CPCat (2019) Degreasers Unknown CPCat lists the use of 1,1'dimethyldiethylene glycol in degreasers, including cold degreasing, de- waxing, de-polishing. Expected users are unknown, due to the limited availability of information. CPCat (2019) Detergents manufacturing Industrial CPCat lists the use of 1,1'dimethyldiethylene glycol in the "manufacture of soaps and detergents, cleaning and polishing." Expected users are industrial based on identification in CDR's industrial processing and use report. VI ------- *** Proposal Draft - Do Not Cite, Quote or Release During the Review*** Table A.3: Uses of 1,1'-Dimethyldiethylene Glycol Use Expected Users Description of Use and References CPCat (2019) Floor wash agent Consumer, commercial CPCat lists the use of 1,1'dimethyldiethylene glycol in cleaning and washing agents for floors. Expected users are not listed, but expected to be consumer and commercial. CPCat (2019) Furniture washing Unknown CPCat lists the use of 1,1'dimethyldiethylene glycol in "varnishing and acid washing of furniture." Expected users are unknown, due to the limited availability of information. CPCat (2019) Industrial cleaning Industrial CPCat lists the use of 1,1'dimethyldiethylene glycol in industrial cleaning and washing, including specialized cleaning activities. Expected users are industrial based on CPCat's user classification. EPA (2017b) Laundry and dishwashing products Consumer, commercial CDR shows the use of 1,1'dimethyldiethylene glycol in laundry and dishwashing products at concentrations at less than 1 percent by weight. Expected users are based on CDR's consumer/commercial classification. CPCat (2019) Lime deposit (calcium) remover Unknown CPCat lists the use of 1,1'dimethyldiethylene glycol in lime deposit (calcium) removers. Expected users are unknown, due to the limited availability of information. VII ------- *** Proposal Draft - Do Not Cite, Quote or Release During the Review*** Table A.3: Uses of 1,1'-Dimethyldiethylene Glycol Use Expected Users Description of Use and References EPA (2017b) Soap, cleaning compound, and toilet preparation manufacturing Industrial CDR shows the use of 1,1'dimethyldiethylene glycol in processing, as an odor agent in soap, cleaning compound, and toilet preparation manufacturing Expected users are industrial based on identification in CDR's industrial processing and use report. CPCat (2019) Textile detergent Unknown CPCat lists the use of 1,1'dimethyldiethylene glycol in "washing agents for textiles (detergent)." Expected users are unknown, due to the limited availability of information. TSCA Conditions of Use: Construction and Building CPCat (2019) Boat and ship buildings Industrial CPCat lists the use of 1,1'dimethyldiethylene glycol in the building and repairing of ships and boats. Expected users are industrial based on CPCat's user classification. CPCat (2019) Construction Industrial CPCat lists the use of 1,1'dimethyldiethylene glycol in the construction of buildings, "general construction of buildings and civil engineering works," and in construction materials. Expected users are industrial based on CPCat's user classification. CPCat (2019) Floor and wall material Industrial CPCat lists the use of 1,1'dimethyldiethylene glycol in floor and wall covering use as building materials. Expected users are industrial based on CPCat's user classification. VIII ------- *** Proposal Draft - Do Not Cite, Quote or Release During the Review*** Table A.3: Uses of 1,1'-Dimethyldiethylene Glycol Use Expected Users Description of Use and References CPCat (2019) Glass building materials Industrial CPCat lists the use of 1,1'dimethyldiethylene glycol in glass building materials. Expected users are not stated but are assumed to be industrial for glass building materials. CPCat (2019) Wood manufacturing Industrial CPCat lists the use of 1,1'dimethyldiethylene glycol in the "manufacture of builders carpentry," and in the "manufacture of wood and of products of wood and cork" and "wooden goods to be used for buildings." CPCat also lists the use of 1,1'dimethyldiethylene glycol as an impregnation material in wood. Expected users are industrial based on CPCat's user classification. TSCA Conditions of Use: Food and Beverages CPCat (2019) Food and beverage service activities1 Unknown CPCat lists the use of 1,1'dimethyldiethylene glycol in food and beverage service activities. Expected users are unknown, due to the limited availability of information. Synapse Information Resources (2009) Food-contact coatings1 Unknown Synapse Information Resources lists the use of 1,1'dimethyldiethylene glycol as a defoamer in food-contact coatings. Expected users are unknown, due to the limited availability of information. Synapse Information Resources (2009) Food-contact metallic manufacturing1 Industrial Synapse Information Resources lists the use of 1,1'dimethyldiethylene glycol as a surface lubricant for the manufacturing of food-contact metallic articles. Expected users are unknown, due to the limited availability of information. IX ------- *** Proposal Draft - Do Not Cite, Quote or Release During the Review*** Table A.3: Uses of 1,1'-Dimethyldiethylene Glycol Use Expected Users Description of Use and References Food packaging1 Unknown Synapse Information Resources (2009) Synapse Information Resources lists the use of 1,1'dimethyldiethylene glycol in food packaging adhesives and in paper/ paperboard in contact with fatty foods. Expected users are unknown, due to the limited availability of information. TSCA Conditions of Use: Fuel Fuel additive Unknown CPCat (2019) CPCat lists the use of 1,1'dimethyldiethylene glycol as a fuel additive. No further information is available on the type of fuel in this use. Expected users are unknown, due to the limited availability of information. Petroleum additive Industrial Synapse Information Resources (2009) Synapse Information Resources lists the use of 1,1'dimethyldiethylene glycol as a petroleum anti- icing additive. Expected users are not listed but expected to be industrial for petroleum additives. TSCA Conditions of Use: Industrial Uses Anti-foaming agents Commercial, industrial CPCat (2019) CPCat lists the use of 1,1'dimethyldiethylene glycol in changing fluid properties as an "anti- foaming agents, foam-reducing agents." Expected users are not listed, but are expected to be commercial and industrial for the use of anti- foaming agents. Metal treatment and coating Industrial CPCat (2019) CPCat lists the use of 1,1'dimethyldiethylene glycol in the treatment and coating of metals. Expected users are industrial based on CPCat's user classification. X ------- *** Proposal Draft - Do Not Cite, Quote or Release During the Review*** Table A.3: Uses of 1,1'-Dimethyldiethylene Glycol Use Expected Users Description of Use and References CPCat (2019) Mining (except oil and gas) support activities Industrial CPCat lists the use of 1,1'dimethyldiethylene glycol in mining (except oil and gas) support activities. Expected users are not listed are assumed to be industrial for mining support activities. TSCA Conditions of Use: Manufacturing EPA (2017b); CPCat (2019) Chemical manufacturing Industrial CDR shows the use of 1,1'dimethyldiethylene glycol in processing, as an odor agent in "all other chemical product and preparation manufacturing." CPCat lists the use of 1,1'dimethyldiethylene glycol in the "manufacture of chemicals and chemical products" and "other chemical products," including basic organic chemicals. Expected users are industrial based on identification in CDR's industrial processing and use report. CPCat (2019) Electronic equipment manufacturing Industrial CPCat lists the use of 1,1'dimethyldiethylene glycol in the manufacture of electronic equipment. Expected users are industrial based on CPCat's user classification. CPCat (2019) Fabricated metal products manufacturing Industrial CPCat lists the use of 1,1'dimethyldiethylene glycol in the "manufacture of fabricated metal products, except machinery." Expected users are industrial based on CPCat's user classification. CPCat (2019) Furniture manufacturing Industrial CPCat lists the use of 1,1'dimethyldiethylene glycol in the manufacture of furniture. Expected users are industrial based on CPCat's user classification. XI ------- *** Proposal Draft - Do Not Cite, Quote or Release During the Review*** Table A.3: Uses of 1,1'-Dimethyldiethylene Glycol Use Expected Users Description of Use and References CPCat (2019) Leather manufacturing Industrial CPCat lists the use of 1,1'dimethyldiethylene glycol in the "manufacture of leather and related products" and in the tanneries industry for leather bags and footwear. CPCat lists the use of 1,1'dimethyldiethylene glycol in impregnation materials for leather. 1,1'dimethyldiethylene glycol Expected users are industrial based on CPCat's user classification. CPCat (2019) Machinery and equipment manufacturing Industrial CPCat lists the use of 1,1'dimethyldiethylene glycol in the manufacture of machinery and equipment. Expected users are industrial based on CPCat's user classification. CPCat (2019); Synapse Information Resources (2009) Paints, varnishes and coatings manufacturing Consumer, commercial, industrial CPCat lists the use of 1,1'dimethyldiethylene glycol in the manufacture of paints, varnishes, and similar coatings. CPCat also lists use in paints, lacquers and varnish products. Synapse Information Resources lists the use of 1,1'dimethyldiethylene glycol as a surfactant in paints. Expected users are industrial based on CPCat's user classification. Consumer and commercial users are not listed but are assumed for uses of paints and varnish products. CPCat (2019) Paper, pulp and paper product manufacturing Industrial CPCat lists the use of 1,1'dimethyldiethylene glycol in the manufacture of pulp, paper, and paper products. CPCat also lists the use of 1,1'dimethyldiethylene glycol in impregnation materials for paper. Expected users are industrial based on CPCat's user classification. XII ------- *** Proposal Draft - Do Not Cite, Quote or Release During the Review*** Table A.3: Uses of 1,1'-Dimethyldiethylene Glycol Use Expected Users Description of Use and References CPCat (2019); Synapse Information Resources (2009) Perfumes manufacturing Consumer, industrial CPCat lists the use of 1,1'dimethyldiethylene glycol in the manufacture of perfumes and toilet preparations, including perfumes. CPCat also lists use in fragrances as an odor agent, including fragrances available for consumer use. Synapse Information Resources lists the use of 1,1'dimethyldiethylene glycol as a fragrance fixative/ diluent, and as an aromatics extraction solvent. Expected users are consumer and industrial based on CPCat's user classification. EPA (2017b); CPCat (2019); Synapse Information Resources (2009) Plastics manufacturing Industrial CDR shows the use of 1,1'dimethyldiethylene glycol in processing, as a plasticizer in "plastics product manufacturing," and in processing, as an odor agent in "plastic material and resin manufacturing." CPCat lists the use of 1,1'dimethyldiethylene glycol in the "manufacture of rubber and plastic products." Synapse Information Resources lists the use of 1,1'dimethyldiethylene glycol comonomer and surfactant for unsaturated polyester resins, and in reinforced plastics. Expected users are industrial based on identification in CDR's industrial processing and use report. CPCat (2019); Synapse Information Resources (2009) Textile manufacturing Consumer, industrial CPCat lists the use of 1,1'dimethyldiethylene glycol in the manufacture of textiles, in "textile impregnation agents," and in textiles used in furniture including chair, seat upholstery and other consumer products. Synapse Information Resources lists the use of 1,1'dimethyldiethylene glycol as a solvent in textile lubricants used for industrial purposes. Expected users are consumer and industrial based on CPCat's user classification. CPCat (2019) Transport equipment manufacturing Industrial CPCat lists the use of 1,1'dimethyldiethylene glycol in the "manufacture of other transport equipment." Expected users are industrial based on CPCat's user classification. XIII ------- *** Proposal Draft - Do Not Cite, Quote or Release During the Review*** Table A.3: Uses of 1,1'-Dimethyldiethylene Glycol Use Expected Users Description of Use and References TSCA Conditions of Use: Miscellaneous Products CPCat (2019) Arts and crafts toys Consumer CPCat lists the use of 1,1'dimethyldiethylene glycol in consumer arts and crafts toys for children. Expected users are consumer based on CPCat's user classification. CPCat (2019) Baby products Consumer CPCat lists the use of 1,1'dimethyldiethylene glycol in consumer baby products. No further information is provided on the specific baby products it is used in. Expected users are consumer based on CPCat's user classification. CPCat (2019) Decor candle Consumer CPCat lists the use of 1,1'dimethyldiethylene glycol in consumer incense products, including a decor candle. Expected users are consumer based on CPCat's user classification. EPA (2017b) Plastic and rubber products Consumer, commercial CDR shows the use of 1,1'dimethyldiethylene glycol in "plastic and rubber products not covered elsewhere" at concentrations of at least 30 percent but less than 60 percent by weight. Expected users are based on CDR's consumer/commercial classification. CPCat (2019); Synapse Information Resources (2009) Printing inks Unknown CPCat lists the use of 1,1'dimethyldiethylene glycol in serigraphy printing ink, also known as screen printing. Synapse Information Resources lists the use of 1,1'dimethyldiethylene glycol as a solvent in printing inks. Expected users are unknown, due to the limited availability of information. XIV ------- *** Proposal Draft - Do Not Cite, Quote or Release During the Review*** Table A.3: Uses of 1,1'-Dimethyldiethylene Glycol Use Expected Users Description of Use and References Other Miscellaneous Uses CPCat (2019) Absorbents and adsorbents Unknown CPCat lists the use of 1,1'dimethyldiethylene glycol in absorbents and adsorbents. Expected users are unknown, due to the limited availability of information. CPCat (2019) Adhesive and binding agents Unknown CPCat lists the use of 1,1'dimethyldiethylene glycol in adhesives and binding agents. Expected users are unknown, due to the limited availability of information. CPCat (2019) Colorant Unknown CPCat lists the use of 1,1'dimethyldiethylene glycol in colorants and coloring agents including dyestuff and pigments, Expected users are unknown, due to the limited availability of information. CPCat (2019) Corrosion inhibitor Unknown CPCat lists the use of 1,1'dimethyldiethylene glycol in corrosion inhibitors and rust inhibitors as a surface treatment. Expected users are unknown, due to the limited availability of information. CPCat (2019) Polishing agent Unknown CPCat lists the use of 1,1'dimethyldiethylene glycol in polishing agents. Expected users are unknown, due to the limited availability of information. XV ------- *** Proposal Draft - Do Not Cite, Quote or Release During the Review*** Table A.3: Uses of 1,1'-Dimethyldiethylene Glycol Use Expected Users Description of Use and References CPCat (2019) Preservatives Unknown CPCat lists the use of 1,1'dimethyldiethylene glycol in preservatives, conserving agents. Preservatives in food products is listed elsewhere. Expected users are unknown, due to the limited availability of information. Non-TSCA Uses CPCat (2019) Agricultural pesticides Unknown CPCat lists the use of 1,1'dimethyldiethylene glycol in pesticides for agricultural use. Expected users are unknown, due to the limited availability of information. CPCat (2019) Bactericides Unknown CPCat lists the use of 1,1'dimethyldiethylene glycol in bactericides, which function to kill bacteria, and bacteriostats, which aims to stop bacteria from reproducing. Expected users are unknown, due to the limited availability of information. CPCat (2019); Biocides Unknown CPCat lists the use of 1,1'dimethyldiethylene glycol in biocides for non-agricultural uses. Expected users are unknown, due to the limited availability of information. CPCat (2019) Body wash Consumer CPCat lists the use of 1,1'dimethyldiethylene glycol in body wash and body cleansers. Expected users are based on CPCat's user classification. CPCat (2019) Deodorants and antiperspirants Consumer CPCat lists the use of 1,1'dimethyldiethylene glycol in deodorants and antiperspirants. Expected users are based on CPCat's user classification. XVI ------- *** Proposal Draft - Do Not Cite, Quote or Release During the Review*** Table A.3: Uses of 1,1'-Dimethyldiethylene Glycol Use Expected Users Description of Use and References CPCat (2019) Disinfectants Consumer, commercial CPCat lists the use of 1,1'dimethyldiethylene glycol in disinfectants for cleaning and washing. Expected users are not listed but are expected to be consumer and commercial as they are stated for "public health area" use. CPCat (2019) Facial treatments Consumer CPCat lists the use of 1,1'dimethyldiethylene glycol in facial treatments. Expected users are based on CPCat's user classification. CPCat (2019) Fungicides Unknown CPCat lists the use of 1,1'dimethyldiethylene glycol in fungicides. Expected users are unknown, due to the limited availability of information. CPCat (2019) Hair color Consumer CPCat lists the use of 1,1'dimethyldiethylene glycol in hair color and hair dye. Expected users are based on CPCat's user classification. CPCat (2019) Hair shampoo Consumer CPCat lists the use of 1,1'dimethyldiethylene glycol in hair shampoos. Expected users are based on CPCat's user classification. CPCat (2019) Hand soap and sanitizers Consumer CPCat lists the use of 1,1'dimethyldiethylene glycol in hand soap and sanitizers for personal care use. Expected users are based on CPCat's user classification. XVII ------- *** Proposal Draft - Do Not Cite, Quote or Release During the Review*** Table A.3: Uses of 1,1'-Dimethyldiethylene Glycol Use Expected Users Description of Use and References CPCat (2019) Nail products Consumer CPCat lists the use of 1,1'dimethyldiethylene glycol in cosmetic nail products. Expected users are not stated but are assumed to be consumer for nail products. Permanent hair color Consumer DeLima Associates (2008, 2014) CPID lists the product for professional use, therefore expected users are consumer. CPCat (2019) Pest control Consumer CPCat lists the use of 1,1'dimethyldiethylene glycol in consumer pest control products. Expected users are consumer based on CPCat's user classification. CPCat (2019) Preservative Unknown CPCat lists the use of 1,1'dimethyldiethylene glycol in in-can preservatives. Expected users are unknown, due to the limited availability of information. CPCat (2019) Shampoo manufacturing Industrial CPCat lists the use of 1,1'dimethyldiethylene glycol in the manufacture of hair shampoo. Expected users are industrial based on CPCat's user classification. CPCat (2019); National Archives and Records Administration (2018) Slimicide Industrial CPCat lists the use of 1,1'dimethyldiethylene glycol in slimicide. Slimicides are authorized for use in the manufacturing of paper and paperboard in the U.S. as an anti-microbial against slime- producing organisms. Expected users are not listed, but expected to be industrial as the use of slimicides are only permitted in manufacturing processes. XVIII ------- *** Proposal Draft - Do Not Cite, Quote or Release During the Review*** Table A.3: Uses of 1,1'-Dimethyldiethylene Glycol Use Expected Users Description of Use and References CPCat (2019) Toothpaste manufacturing Industrial CPCat lists the use of 1,1'dimethyldiethylene glycol in the manufacture of toothpaste. Expected users are industrial based on CPCat's user classification. Children's Products CDR reports use in personal care products intended for children; CPID reports uses in baby products and arts and crafts. Recycling and Disposal In the 2016 CDR, two facilities reported that 1,1 '-dimethyldiethylene glycol was not recycled (which could mean recycled, reprocessed, or reused). For one facility, recycling information was withheld. No further information about recycling or disposal was found. Note(s): 1. TSCA use based on the assumption that the chemical is used in the manufacturing of products and not intended to be a component of food. XIX ------- *** Proposal Draft - Do Not Cite, Quote or Release During the Review*** A.3. References Boscia. (2018). Sake Hydrating and Brightening Serum. Retrieved from https://www.boscia.com/shop/product detail.php?products id=278 California Dept of Pesticide Regulation. (2013). DPR Databases. Retrieved from https: //www. cdpr. ca. gov/dprdatabase .htm Cetaphil. (2018). Baby Daily Lotion. Retrieved from https://www.cetaphil.com/babv-lotion/ CVS. (2018). Beauty 360 Pear And White Tea Anti-Bacterial Foaming Hand Soap, 7.5 OZ. Retrieved from https://www.cvs.com/shop/beautv-360-pear-and-white-tea-anti-bacterial-foaming-hand- soap-7-5 -oz-prodid-102045 7 Danish EPA. (2018). Danish surveys on chemicals in consumer products. Retrieved from https://eng.mst.dk/chemicals/chemicals-in-products/consumers-consumer-products/danish- survevs-on-consumer-products/ DeLima Associates. (2008). Revlon Colorist Expert Color and Glaze System, Black 20. Retrieved from https://www.whatsinproducts.com/tvpes/tvpe detail/l/8746/standard/Revlon%20Colorist%20Exp ert%20Color%20and%20Glaze%20Svstem.%20Black%2020/l 8-002-065 DeLima Associates. (2014). PortionPac ScrubPac4 Concentrated Heavy Duty All Purpose Detergent, Professional Use. Retrieved from https://www.whatsinproducts.com/tvpes/tvpe detail/1/14146/standard/PortionPac%20ScrubPac4 %20Concentrated%20Heavv%20Dutv%20All%20Purpose%20Detergent.%20Professional%20U se/16-032-008 DeLima Associates. (2018). Consumer Product Information Database. Retrieved from https: //www. whatsinproducts. com/ Descartes Datamyne. (2018). Descartes Datamyne Import-Export Database. Dionisio, K. L., (CPCat) Frame, A. M., Goldsmith, M.-R., Wambaugh, J. F., Liddell, A., Cathey, T., . . . Judson, R. S. (2015). Exploring consumer exposure pathways and patterns of use for chemicals in the environment. Toxicology Reports, 2, 228-237. doi :http ://dx.doi .org/10.1016/i .toxrep .2014.12.009 Dove. (2018). Nutritive Solutions Intensive Repair Conditioner. Retrieved from https://www.dove.com/za/hair-care/conditioner/nutritive-solutions-intensive-repair- conditioner.html DrugBank. (2018b). DrugBank Database. Retrieved from https://www.drugbank.ca/ European Chemicals Agency (ECHA). (2018a). l,l'-oxydipropan-2-ol. Retrieved from https://echa.europa.eu/substance-information/-/substanceinfo/100.003.475 European Chemicals Agency (ECHA). (2018b). Oxydipropanol. Retrieved from https://echa.europa.eu/registration-dossier/-/registered-dossier/16016/l XX ------- *** Proposal Draft - Do Not Cite, Quote or Release During the Review*** EWG. (2018b). Skin Deep Cosmetics Database. Retrieved from https: //www.ewg. org/skindeep/#. W4RpIPlKiUk GoodGuide. (2011b). Scorecard: The Pollution Information Site. Retrieved from http://scorecard.goodguide.com/chemical-profiles/index.tcl Government of Canada. (2018). Chemical Substances: Services and Information. Retrieved from https://www.canada.ca/en/health-canada/services/chemical-substances.html Kim, S., Thiessen, P. A., Bolton, E. E., Chen, J., Fu, G., Gindulyte, A., . . . Bryant, S. H. (2016). PubChem Substance and Compound databases. Nucleic Acids Research, 44 (Database issue), D 1202-D 1213. doi: 10.1093/nar/gkv951 Kirk-Othmer. (2006). Kirk-Othmer Encyclopedia of Chemical Technology. L'Oreal. (2018a). INFALLIBLE® Pro-Glow Foundation. Retrieved from https://www.lorealparisusa.com/products/makeup/face/foundation-makeup/infallible-pro-glow- foundation.aspx? shade=201 -classic-ivory L'Oreal. (2018b). Root Rescue™. Retrieved from https://www.lorealparisusa.com/products/hair- color/products/root-touch-up/root-rescue.aspx?shade=9-light-blonde Medline.com. (2009). Material Safety Data Sheet. Retrieved from https://www.medline.com/media/catalog/Docs/MSDS/MSD SDSD10918.pdf Code of Federal Regulations, Title 21 Food and Drugs, (2018). National Pesticide Information Retrieval System (NPIRS). (2018). Company Information. Retrieved from http://npirspublic.ceris.purdue.edu/ppis/chemical2.aspx Neutrogena. (2018a). Ageless Intensives® Anti-Wrinkle Deep Wrinkle Serum. Retrieved from https://www.neutrogena.com/skin/skin-moisturizers/ageless-intensives-anti-wrinkle-deep- wrinkle-serum/6806151 .html Organisation for Economic Cooperation and Development (OECD). (2018). eChemPortal: Global Portal to Information on Chemical Substances. Retrieved from https: //www .echemportal. org/echemportal/index. action P&G. (2015). Safety Data Sheet. Retrieved from https://www.marlobeautv.com/images/graphics/pro2pro article image/7973 .pdf Sherlock, Scott (2019). RE_ TSCA section 6~low priority chemical reviews—CASRN 110-98-5 (referenced in CDR-2016-00304 and 306). Email 25JUN19 Shiseido. (2018). Benefiance WrinkleResist24 Protective Hand Revitalizer. Retrieved from https: //www. shiseido. com/benefiance -wrinklere sist24-protective-hand-revitalizer- 0730852118744.html Skinfood. (2018). 0.9 Moist Toner. Retrieved from https://theskinfood.us/products/0-9-moist-toner Synapse Information Resources. (2009). Specialty Chemicals Source Book. Fourth Edition. Volume 1. XXI ------- *** Proposal Draft - Do Not Cite, Quote or Release During the Review*** U.S. Environmental Protection Agency (EPA). (2002). 1986-2002 Historical IUR Data. Retrieved from Excel File U.S. Environmental Protection Agency (EPA). (2006). 2006 IUR Public Database. U.S. Environmental Protection Agency (EPA). (2017a). Functional Use Database (FUse). Retrieved from: https://catalog.data.gov/dataset/functional-use-database-fuse U.S. Environmental Protection Agency (EPA). (2017b). Non-Confidential 2016 Chemical Data Reporting (CDR). Retrieved from https://www.epa.gov/chemical-data-reporting U.S. Environmental Protection Agency (EPA). (2018a). ChemView. Retrieved from https://chemview.epa.gov/chemview U.S. Environmental Protection Agency (EPA). (2018b). Envirofacts Multisystem Search. Retrieved from https://www3.epa.gov/enviro/facts/multisvstem.html U.S. Environmental Protection Agency (EPA). (2018c). Look up table for BR Waste Code (National Biennial RCRA Hazardous Waste Report). Retrieved from https://iaspub.epa.gov/enviro/brs codes v2.waste lookup U.S. Environmental Protection Agency (EPA). (2018d). Safer Chemical Ingredients List. Retrieved from https://www.epa.gov/saferchoice/safer-ingredients U.S. Environmental Protection Agency (EPA). (2018e). TRI-Listed Chemicals. Retrieved from https://www.epa.gov/toxics-release-inventorv-tri-program/tri-listed-chemicals U.S. National Library of Medicine (NLM). (2018a). ChemlDplus, a TOXNET Database. Retrieved from https: //chem .nlm .nih. gov/chemidplus/ U.S. National Library of Medicine (NLM). (2018b). Haz-Map. Retrieved from https://hazmap.nlm .nih. gov/categorv-details?id=5009&table=copvtblagents U.S. Patent and Trademark Office (USPTO). (2018b). USPTO Patent Full-Text and Image Database. Retrieved from http: //patft .uspto. gov/netacgi/nph- Parser?Sectl=PT02&Sect2=HIT0FF&p=l&u=%2Fnetahtml%2FPT0%2Fsearch- bool ,html&r=0&f=S&l=5 O&TERM 1=1 %2C 1 %27-oxvdi-2- propanol&FIELD 1=&co 1 =AND&TERM2=&FIELD2=&d=PTXT Ullmann's. (2000). ULLMANN'S Encyclopedia of Industrial Chemistry. Washington State Dept. of Ecology. (2018). Children's Safe Product Act Reported Data. Retrieved from https://fortress.wa.gov/ecv/cspareporting/ Zep Inc. (2015). Safety Data Sheet Timemist(R) Air Sanitizer. Retrieved from https://content.interlinebrands.com/product/document/10137/88Q923 SDS E.pdf XXII ------- *** Proposal Draft - Do Not Cite, Quote or Release During the Review*** Appendix B: Hazard Characterization Table B.1: Human Health Hazard ADME Source Exposure Route Species & strain (if available) Duration Doses and replicate number Effect Study Details 4940508, 4940301, Dermal (in vitro) Human cadaver skin 24 hours Dose: 768 The test material Methods: 3039551 undiluted test substance Replicates: 7 samples from 4 cadavers was considered a slow penetrant • Test substance reported as CASRN 25265-71-8 • Purity: 99.9% • OECD Guideline 428 • GLP compliant Results: • Steady state penetration was 39.3 |jg/cm2-hour and the permeability coefficient was 3.85x10 5 cm/hour 3041958 Intravenous and Dog 24 hours Doses: 5000 The test material Methods: oral mg/kg oral and 2000 mg/kg IV Replicates: 2 dogs is no longer detectable in blood after 24 hours • Test substance reported as CASRN 25265-71-8 • Purity not reported • GLP compliance not reported 4940456, 4940388 Oral (gavage) Fischer 344 rats Single Dose: 48.2 The test material Methods: exposure, 24 hour mg/kg Replicates: 5 is rapidly absorbed and • Test substance reported as CASRN 24800-44-0 observation male rats distributed, and primarily excreted through urine. It is also extensively metabolized to dipropylene and monopropylene glycol and further oxidized to C02 • Purity: 99.8% • GLP compliant Results: • Absorption: 91.4 ± 2.07 % of the dose administered was recovered indicating tripropylene glycol is rapidly absorbed • Distribution: The liver and kidney had the greatest amounts of tripropylene glycol • Metabolism: Tripropylene glycol is extensively metabolized. 5.8% of the XXIII ------- *** Proposal Draft - Do Not Cite, Quote or Release During the Review*** Table B.1: Human Health Hazard dose was recovered as unmetabolized parent compound. Tripropylene glycol is metabolized to dipropylene and monopropylene glycol and further oxidized to CO2 • Excretion: Dipropylene glycol was excreted primarily in the urine (52.3 ± 3.54%) and in exhaled breath (20.7±0.59%) Acute Mammalian Toxicity Source Exposure Route Species & strain (if available) Duration Doses and replicate number Effect Study Details 4951174 Oral (gavage) Albino rats Single exposure, 14 day observation Doses: 10,000, 12,000, 14,000, 15,000, 16,000, 18,000, 20,000 and 25,000 mg/kg Replicates: 4- 20 per group Groups: young male, male, adolescents, female adolescents, and male adults LDso: 12500 mg/kg (most conservative) Methods: • Test substance reported as CASRN 110-98-5 • Purity not reported • GLP compliance not reported Mortality: • Young male rats: 10,000 mg/kg: 10%; 12,000 mg/kg: 10%; 14,000 mg/kg: 15%; 15,000 mg/kg: 60%; 16,000 mg/kg: (90%); LD50:14,8000 mg/kg • Adolescent male rats: 10,000 mg/kg: 10%; 12,000 mg/kg: 15%; 14,000 mg/kg: 75%; 15,000 mg/kg: 90%; 16,000 mg/kg: 100%; 18,000 mg/kg: 100%; 20,000 mg/kg: 90%; LD50: 12,500 mg/kg • Adult male rats: 12,000 mg/kg: 10%; 14,000 mg/kg: 40%; 15,000 mg/kg: 80% LD50:14,200 mg/kg • Adolescent female rats: 12,000 mg/kg: 0%; 14,000 mg/kg: 0%; 16,000 mg/kg: 40%; 18,000 mg/kg: 80%; 20,000 mg/kg: 80%; 25,000 mg/kg: 100% LD50: 16,500 mg/kg XXIV ------- *** Proposal Draft - Do Not Cite, Quote or Release During the Review*** Table B.1: Human Health Hazard 4951174 Oral (gavage) Guinea pigs Single exposure, 14 day observation Doses: 3,000, 4,000, 5,000, 6,000, 8,000, 10,000, 12,000, 15,000 and 20,000 mg/kg Replicates: 1- 10 per group LDso: 10000 mg/kg Methods: • Test substance reported as CASRN110-98-5 • Purity not reported • GLP compliance not reported Morality: • 3,000: 0%; 4,000: 20%; 5,000:10%; 6,000: 30%; 8,000:10%; 10,000: 50%; 12,000: 88%; 15,000: 100%; 20,000 mg/kg: 100% 4951207 Oral (gavage) Albino rats Single exposure, 14 day observation Doses: 8815, 10,660, 12,710, 15,273, and 18,348 mg/kg Replicates: 5 per sex per dose LDso: 16195 mg/kg Methods: • Test substance reported as CASRN 110-98-5 • Purity not reported • GLP compliance not reported Mortalities: • 8815 mg/kg: 0/5 males, 0/5 females • 10,660 mg/kg: 2/5 males, 0/5 females • 12710 mg/kg: 0/5 males, 0/5 females • 15273 mg/kg: 2/5 males, 2/5 females • 18348 mg/kg: 4/5 males, 4/5 females 4940517 Inhalation Rats 8 hour exposure, observed for 14 days Dose: 0.083 mg/L Replicates: 6 animals LC5o> 0.083 mg/L Methods: • Test substance CASRN 24800-44-0 • Purity not reported • Pre-GLP compliance 4940443 Inhalation (aerosol) Sprague-Dawley rats 4 hour exposure, observed for 14 days Dose: 2.34 mg/L Replicates: 5 per sex LCso > 2.34 mg/L Methods: • Test substance reported as CASRN 25265-71-8 • Purity: 100% • EPA OPP 81-3 • GLP compliant 4940519 Dermal Albino rabbits 24 hour exposure, observed for 14 days Dose: 16320 mg/kg Replicates: 5 males LDso > 16320 mg/kg Methods: • Test substance reported as CASRN 24800-44-0 • Purity not reported • Pre-GLP compliance XXV ------- *** Proposal Draft - Do Not Cite, Quote or Release During the Review*** Table B.1: Human Health Hazard 4940453 Dermal New Zealand White 24 hour Dose: 5010 LDso >5010 Methods: rabbits exposure, observed for 14 days mg/kg Replicates: 5 per sex mg/kg • Test substance: CASRN 25265-71-8 • Purity: 100% • EPA OPP 81-2 • GLP compliant Repeated Dose Toxicity Source Exposure Route Species & strain (if available) Duration Doses and replicate number Effect Study Details 4940389, 4940514 Oral (gavage) Sprague-Dawley rats Male: 2 weeks Doses: 0, 8, NOAEL: 200 Method: prior to 40, 200, and mg/kg-day • Test substance reported as CASRN mating, 49 1000 mg/kg- LOAEL: 1000 24800-44-0 days total Females: 2 weeks prior to day Replicates: 12 per sex per mg/kg-day based on organ weight changes in • Purity > 98% • OECD Guideline 422 • GLP compliant mating up to group parents day 3 of lactation 4940384, 4940445 Oral (drinking B6C3F1 mice 2 years Doses: NOAEL: 1040 Methods: water) Males: 0, 735, 1220, and 2390 mg/kg-day Females: 0, 575,1040, and 1950 mg/kg- day Replicates: 50 per sex per dose mg/kg-day LOAEL: 1950 mg/kg-day based on decreased mean body weight • Test substance reported as CASRN 25265-71-8 • Purity: 99% • NTP Guideline • GLP compliant XXVI ------- *** Proposal Draft - Do Not Cite, Quote or Release During the Review*** Table B.1: Human Health Hazard 4940466, 4940384 Oral (drinking water) B6C3F1 mice 13 weeks Dose: Males: 0, 715, 1350, 2620, 4790 and 11,000 mg/kg- day Females: 0, 1230, 2140, 4020, 7430 and 14700 mg/kg- day Replicates: 10 per sex per dose NOAEL: 2620 mg/kg-day (male) LOAEL: 4790 mg/kg-day (male), based on increased liver weight Methods: • Test substance reported as CASRN 25265-71-8 • Purity: 99% • NTP Guideline • GLP compliant Endpoints: • Mortality o 7,430 mg/kg-day females: (1/10) hypothermia o 11,000 mg/kg-day males: (3/10) dehydration o 14,700 mg/kg-day females: (1/10) dehydration 4940384, 4940465, Oral (drinking F344/N rats 2 years Doses: NOAEL: 115 Methods: 4940455 water) Males: 0,115, mg/kg-day • Test substance reported as CASRN 470, and 3040 LOAEL: 470 25265-71-8 mg/kg-day mg/kg-day based • Purity: 99% Females: 0, on increased • GLP compliance not reported 140, 530, and incidence of 2330 mg/kg- nephropathy, focal day histiocytic, and Replicates: 50 focal per sex per granulomatous dose inflammation in male livers XXVII ------- *** Proposal Draft - Do Not Cite, Quote or Release During the Review*** Table B.1: Human Health Hazard 4940384, 4940462 Oral (drinking F344/N rats 14 weeks (3 Doses: NOAEL: 425 Methods: water) months) Males: 0, 425, 890, 1840, 3890, and 12,800 mg/kg- day Females: 0, 460, 920, 1690, 3340, and 8950 mg/kg-day Replicates: 10 per sex per dose mg/kg-day LOAEL: 890 mg/kg-day based on relative liver weight • Test substance reported as CASRN 25265-71-8 • Purity: 99% • GLP compliance not reported Reproductive Toxicity Source Exposure Route Species & Strain (if available) Duration Doses and replicate number Effect Study Details 4940389,4940514 Oral (gavage) Sprague-Dawley rats Male: 2 weeks Doses: 0, 8, NOAEL: 200 Method: prior to mating, 49 days total; Females: 2 weeks prior to mating up to 40, 200, and 1000 mg/kg- day Replicates: 12 per sex per group mg/kg-day LOAEL: 1000 mg/kg-day based on organ weight changes in parents • Test substance reported as CASRN 24800-44-0 • Purity > 98% • OECD Guideline 422 • GLP compliant day 3 of lactation Developmental Toxicity Source Exposure Route Species & Strain (if available) Duration Doses and replicate number Effect Study Details XXVIII ------- *** Proposal Draft - Do Not Cite, Quote or Release During the Review*** Table B.1: Human Health Hazard 4940450, 4440869, 4940388, 3041958 Oral (gavage) Pregnant Sprague- Dawley rats GD 6-15 Doses: 0, 800, 2000, and 5000 mg/kg-day Replicates: 20- 27 per dose NOAEL: 2000 mg/kg-day LOAEL: 5000 mg/kg-day based on decreased fetal body weight Methods: • Test substance reported as CASRN 25265-71-8 • Purity > 96% • NTP Guideline • GLP compliance 4440871, 4940459, 4940388 Oral (gavage) New Zealand White rabbit GD 6-19 Doses: 0, 200, 400, 800, and 1200 mg/kg-day Replicates: 24 per group NOAEL: 1200 mg/kg-day Methods: • Test substance reported as CASRN 25265-71-8 • Purity > 96% • NTP protocol NTP-90-CTER-126 • GLP compliant Cancer Source Exposure Route Species & Strain (if available) Duration Doses and replicate number Effect Study Details 4940448,, 4940384 Oral (drinking water) Fischer 344 rats 2 years Doses: Males: 0,115, 470 and 3,040 mg/kg-day Females: 0, 140, 530 and 2,330 mg/kg- day Replicates: 50 per sex per dose Negative Methods: • Test substance reported as CASRN 25265-71-8 • Purity: 99% • NTP Guideline • GLP compliant XXIX ------- *** Proposal Draft - Do Not Cite, Quote or Release During the Review*** Table B.1: Human Health Hazard 4940384, 4940448 Oral (drinking water) B6C3F1 mice 2 years Doses: Males: 735, 1220, and 2390 mg/kg-day; Females: 575, 1040, and 1950 mg/kg-day Replicates: 50 per sex per dose Negative Methods: • Test substance reported as CASRN 25265-71-8 • Purity: 99% • NTP Guideline • GLP compliant Genotoxicity Source Test Type & endpoint Species & strain (if available) Metabolic activation Doses and controls Results Study Details 4940446, 4940384 Gene mutation (in vitro) Salmonella typhimurium strains TA 97, TA98, TA100, TA 1535, TA 1538 With and without Doses: 0,100, 333, 1000, 3333 and 10000 |jg/plate Negative Methods: • Test substance reported as CASRN 25265-71-8 • Purity > 99% • NTP Guideline • GLP compliant 4940463 Gene mutation (in vitro) Mouse lymphoma L5178Y dells With and without Doses: 50, 100, 300, 500, 700, 1000, 2500 and 5000 [jg/mL Negative Methods: • Test substance reported as CASRN 25265-71-8 • Purity not reported • OECD Guideline 476 • GLP compliant 4940467 Gene mutation (in vitro) Salmonella typhimurium strains TA98, TA100, TA 1535, TA1537, TA 1538 With and without Doses: 0.100, 0.316,1.00, 3.16, 10.0,31.6 and 100 [jL/plate Negative Methods: • Test substance reported as CASRN 25265-71-8 • Purity: 99.9% • OECD Guideline 471 • GLP compliant XXX ------- *** Proposal Draft - Do Not Cite, Quote or Release During the Review*** Table B.1: Human Health Hazard 4940451, 4940388 Chromosomal Mouse N/A Doses: 0, 500, Negative Methods: aberrations (in 1000, and 2000 • Test substance reported as CASRN vivo) mg/kg 25265-71-8 Replicates: 6 • Purity: 99.9% per group • OECD Guideline 474 • GLP Compliant Sensitization Source Exposure Route Species & Strain (if Duration Doses and Effect Study Details available) replicate number 4940444,4946133 Dermal patch Human 2 day Study 1 Equivocal Methods: exposure, Doses: 1%, • Test substance reported as CASRN observed 7 2%, 5%, and 25265-71-8 days 10% in • Purity > 96% Replicates: 34 • GLP compliance not reported patients Results: • 1 person had positive reaction (only to Study 2 standard grade dipropylene glycol) Dose: 10% in • 488 subjects showed no reaction and Replicates: 13 subjects showed equivocal reaction 503 volunteers to standard grade substance 212 Males • 480 subjects showed no reaction and 291 Females 17 subjects showed equivocal reaction to cosmetic grade substance • Irritation was indicated in 2 analytical grade and 5 cosmetic grade volunteers XXXI ------- *** Proposal Draft - Do Not Cite, Quote or Release During the Review*** Table B.1: Human Health Hazard 4940460 Dermal Guinea pigs 6 hour exposure, induction repeated 3 times for 2 weeks Dose: 0.5 mL Replicates: 10 animals (7 Males 3 Females) Negative Methods: • Test substance reported as CASRN 25265-71-8 • Purity: 100% • EPA OPP 81-6 • GLP compliant Results: • 1 animal displayed slight patchy erythema 24 hours after 3118622 Dermal patch Humans 24 hour exposure, scored after 48 hours; repeated for 9 applications Dose: 0.4 mL Replicates: 42 volunteers Negative Methods: • Test substance reported as CASRN 25265-71-8 • Purity not reported • Modified Draize Method • GLP compliance not reported Irritation Source Exposure Route Species & Strain (if available) Duration Doses Effect Study Details 4940512 Dermal Rabbits 24 hours Dose: 0.01 mL of undiluted solution Replicates: 5 animals Minimally irritating Methods • Test substance reported as CASRN 24800-44-0 • Purity not reported • Pre-GLP compliance Results: • Mean irritation score was 2 out of 10 (with 1 = no irritation). Moderate capillary injection was observed on 4 rabbits XXXII ------- *** Proposal Draft - Do Not Cite, Quote or Release During the Review*** Table B.1: Human Health Hazard 4940527 Dermal patch Humans 24 hours Dose: 0.2 mL of 25% solution Replicates: 33 volunteers Negative Methods • Test substance reported as CASRN 24800-44-0 • Purity not reported • Non-GLP compliant Results: • 2 volunteers had mild erythema at 0.5 hours which resolved by 24 hours 4940526 Dermal patch Humans Daily for 14 days Dose: 0.2mL of 50% solution Replicates: 26 volunteers Negative Methods • Test substance reported as CASRN 24800-44-0 • Purity not reported • Non-GLP compliant • 1/26 subjects did not complete the due to reasons unrelated to exposure 4940447 Dermal Humans Daily for 14 days Doses: 0.2 mL of 50% and 100% of test substance Replicates: 26 skin-sensitive volunteers Negative Methods: • Test substance reported as CASRN 25265-71-8 • Purity not specified • GLP compliance not reported Results: • One volunteer had a mildly irritating response (erythema) to 100% substance before day 4 4940461 Dermal New Zealand White rabbit 4 hour exposure, observed for 72 hours Dose: 0.5 mL Replicates: 3 per sex Negative Methods: • Test substance reported as CASRN 25265-71-8 • Purity: 100% • EPA OPP 81-5 • GLP compliant Results: • Very slight erythema observed in 1/6 animals within 45 min, but all test areas were normal for the remaining observation periods XXXIII ------- *** Proposal Draft - Do Not Cite, Quote or Release During the Review*** Table B.1: Human Health Hazard 4940458 Dermal patch Human 24 hour exposure Dose: 0.2 mL of 25% Replicates: 33 subjects Mildly irritating Methods: • Test substance reported as CASRN 25265-71-8 • Purity not reported • GLP compliance not reported Results: • At the 24-hour scoring, 4/33 subjects displayed mild erythema 3118622 Dermal Albino rabbit 24 hour exposure, observed for 72 hour Dose: 0.5 mL Replicates: 3 rabbits per group Negative Methods: • Test substance reported as CASRN 25265-71-8 • Purity not reported • Draize Method • GLP compliance not reported 4940453 Dermal New Zealand White 24 hour Dose: 5010 Negative Methods: rabbit exposure, observed for 14 day mg/kg Replicates: 5 per sex • Test substance reported as CASRN 25265-71-8 • Purity: 100% • EPA OPP 81-2 • GLP compliant Results: • Very slight irritation was observed in 5/10 animals 45 minutes after removal of patch, but all effects were fully reversible by 48 hours XXXIV ------- *** Proposal Draft - Do Not Cite, Quote or Release During the Review*** Table B.1: Human Health Hazard 4940449 Ocular New Zealand White rabbit Single exposure, 72 hour exposure Dose: 0.1 mL Replicates: 3 per sex Negative Method: • Test substance reported as CASRN 25265-71-8 • Purity: 100% • EPA OPP 81-4 • GLP compliant Results: • 6/6 animals had conjunctival redness and 2/6 animals displayed chemosis after 1 hour, but these results were fully reversible by 24 hours 3118622 Ocular Rabbits Single exposure, observed for 7 days Dose: 0.1 mL Replicates: 3 rabbits per group Negative Method: • Test substance reported as CASRN 25265-71-8 • Purity not reported • Draize Method • GLP compliance not reported Results: • Eye irritation did not differ between vehicle control and test material 4940520 Ocular Rabbits Single exposure, observed over 24 hours Dose: 0.5 mL of undiluted solution Replicates: 5 rabbits Negative Methods • Test substance reported as CASRN 24800-44-0 • Purity not reported • Pre-GLP compliance Results: • The overall irritation score was 1 (trace or no injury) and was fully reversible. The test material was considered non- irritating XXXV ------- *** Proposal Draft - Do Not Cite, Quote or Release During the Review*** Table B.1: Human Health Hazard 4940518 Ocular New Zealand White Single Dose: 0.1 mL Negative Methods rabbits exposure, observed over 72 hours of undiluted solution Replicates: 2 animals • Test substance reported as CASRN 24800-44-0 • Purity=99.6% • OECD Guideline 405 • GLP compliant Results: • 2/2 animals had mild conjunctival redness, chemosis, and conjunctival discharge at the 1-hour scoring • All effects were reversible by 24 hours 4940513 Ocular SkinEthic Human Corneal Epithelium Model (in vitro) 10 minutes Dose: 30 pL of undiluted solution Replicates: 3 replicates Negative Methods • Test substance reported as CASRN 24800-44-0 • Purity: 99.6% • GLP compliant Other Source Exposure Route Species & Strain (if available) Duration Doses Effect Study Details 4088550 Cell viability Human embryonic stem NA Doses: 0.0001 NOAEL: Methods: cells (hESCs) and M to 0.1 M 0.00745M for • Test substance reported as CASRN human adult pulmonary fibroblasts (hPF) hESCs; IC50: 0.04 M for hESCs and hPF 25265-71-8 • Purity not reported • GLP compliance not reported Results: • In hESCs the estimated NOAEL was 0.00745M and the IC50 was 0.045M, only the highest concentration tested was significantly different from (vehicle) controls • The IC50 in hPF cells was identical (0.04M), but a reliable NOAEL could not be determined XXXVI ------- *** Proposal Draft - Do Not Cite, Quote or Release During the Review*** Table B.2: Environmental Hazard Aquatic Toxicity: Experimental Source Species & strain (if available) Duration Doses and replicate number Effect Study Details 4940438 Daphnia magna 48 hours Dose: 100 mg/L ECso > 100 mg/L Methods: • Test substance reported as CAS RN 25265-71 -8 • Purity: 100% • EPA 540/9-82-024, EPA-540/9-85-005 and ASTM Standards E729-88a • GLP compliant 4940439 Daphnia 48 hours Doses: 0, 12.5, 25, 50, ECso > 100 Methods: magna and 100 mg/L mg/L • Test substance reported as CAS RN 25265-71 -8 • Purity: 99.6% • OECD Guideline 202 • GLP compliant 4940389, 4940442 Oryzias 96 hours Doses: 5 concentrations LCso > Methods: latipes between 95-1000 mg/L (nominal) Replicates: 10 per group 1000 mg/L • Test substance reported as CASRN 24800-44-0 • Purity: 97% • OECD Guideline 203 • Not GLP compliant 4940389, 4940433 Daphnia 24 hours Doses: 5 concentrations EC50 > Methods: magna between 10-1000 mg/L Replicates: 4 replicates per concentration, 5 organisms per replicates 1000 mg/L • Test substance reported as CASRN 24800-44-0 • Purity: 97% • OECD Guideline 202 • Not GLP compliant 4940389 Selenastrum 72 hours Doses: 5 nominal EC50 > Methods: capricornutum concentrations 95-1000 mg/L 1000 mg/L • Test substance reported as CASRN 24800-44-0 • Purity: 97% • OECD Guideline 201 • Not GLP compliant Aquatic Toxicity: Estimated Model Duration Species Predicted Effect Level Notes ECOSAR v2.0 96 hours Freshwater fish 18000 mg/L Physical properties used for estimation Log K0w -0.46 (exp); water solubility 1000 (Class: Neutral mg/L; melting point -40°C SMILES: 0(CC(0)C)CC(0)C Organics) XXXVII ------- *** Proposal Draft - Do Not Cite, Quote or Release During the Review*** ECOSAR v2.0 (Class: Neutral 48 hours Daphnia magna 8100 mg/L Physical properties used for estimation Log K0w -0.46 (exp); water solubility 1000 mg/L; melting point-40°C SMILES: 0(CC(0)C)CC(0)C Organics) ECOSAR v2.0 (Class: Neutral 72 hours Green algae 2400 mg/L Physical properties used for estimation Log K0w -0.46 (exp); water solubility 1000 mg/L; melting point -40°C SMILES: 0(CC(0)C)CC(0)C Organics) ECOSAR v2.0 (Class: Neutral ChV Freshwater fish 1300 mg/L Physical properties used for estimation Log K0w -0.46 (exp); water solubility 1000 mg/L; melting point -40°C SMILES: 0(CC(0)C)CC(0)C Organics) ECOSAR v2.0 (Class: Neutral ChV Daphnia magna 420 mg/L Physical properties used for estimation Log K0w -0.46 (exp); water solubility 1000 mg/L; melting point -40°C SMILES: 0(CC(0)C)CC(0)C Organics) ECOSAR v2.0 (Class: Neutral ChV Green algae 370 mg/L Physical properties used for estimation Log K0w -0.46 (exp); water solubility 1000 mg/L; melting point -40°C SMILES: 0(CC(0)C)CC(0)C Organics) Table B.3: Fate Environmental Fate: Experimental Source Endpoint Duration Doses and number of replicates Results Study Details 4940389 BOD 28 days Dose: 100 mg/L Not readily biodegradable Method: • Test substance reported as CASRN 24800-44-0 • Purity not reported • OECD Guideline 301C • GLP compliant Results: • 0% degradation by TOC and 0-3% by GC after 28 days • 1 -2% BOD degradation after 28 days 4940425 CO2 evolution 28 days NA Not readily biodegradable Method: • Test substance reported as CASRN 24800-44-0 • Purity: 95% • OECD Guideline 301B • GLP compliant Results: XXXVIII ------- *** Proposal Draft - Do Not Cite, Quote or Release During the Review*** • 0% degradation by DOC after 28 days 4-5% degradation by CO2 evolution after 28 days 4940426 O2 consumption 28 days NA 69% degradation after 28 days Method: • Test substance reported as CASRN 24800-44-0 • Purity: 99.43% • OECD Guideline 301D • GLP compliant Results: • 59% in 11 days 69% degradation after 28 days 4940432 O2 consumption, CO2 consumption, DOC removal 28 days Dose: 100 mg/L Readily biodegradable Method: • Test substance reported as CASRN 24800-44-0 • Purity: 99.9% • OECD Guideline 301F • GLP compliant Results: • 81.9% O2 consumption, 61% CO2 consumption, 91.7% DOC removal after 28 days • 55.3% biodegradation within 10-day window 4940431 O2 consumption 28 days NA Not readily biodegradable Method: • Test substance reported as CASRN 24800-44-0 • Purity: 99.43% • OECD Guideline 301D • GLP compliant Results: • 0% degradation by O2 consumption after 28day (below detection limit of <2.5% ThOD) 4940428 Aerobic seawater 64 days Dose: 51.2 mg/L • 46.1% DOC removal after 64 days • 33.5% CO2 evolution after 62 days Method: • Test substance reported as CASRN 24800-44-0 • Purity 99.4% • OECD Guideline 306 • GLP compliant XXXIX ------- *** Proposal Draft - Do Not Cite, Quote or Release During the Review*** 4946320 Sediment/Water 20 days Doses: 5 and 10 mg/L Inherently Biodegradable Method: • Test substance reported as CASRN 24800-44-0 • Purity not reported • OECD Guideline 301E • GLP compliant Endpoint: • <10% after 20 days with 10 mg/L dose • 100% biodegradation by day 16 with 5 mg/L • Authors suggest that oxidation products may be toxic to inoculum and TPG is inherently biodegradable 4940427 O2 consumption, CO2 evolution, DOC removal 28 days Dose: 100 mg/L Readily biodegradable Methods: • Test substance reported as CAS RN 25265-71 -8 • Purity: 99.9% • OECD Guideline 301F • GLP compliant Endpoints: • O2 consumption: 58.7% after 10 days, 84.4% after 28 days. • CO2 evolution: 64.5% after 28 days. DOC removal: 93.4% after 28 days. 1763085 BOD Doses: 14- 6816 mg/L Insufficient O2 consumption Methods: • Test substance reported as CAS RN 25265-71 -8 • Purity not reported • Standard methods (APHA195) • GLP compliance not reported Endpoints: • BOD < 0.001 g/g using microbial seed from supernatant of settled raw sewage. • Insufficient O2 consumption 4940429 DOC removal using activated sludge inoculum 6 weeks Dose: 18.5 mg/L DOC removal 83.6% after 6 weeks Methods: • Test substance reported as CAS RN 25265-71 -8 • Purity > 99.9% • OECD Guideline 301F or OECD Guideline 302A • GLP compliant Endpoints: • DOC removal 83.6% after 6 weeks • Biodegradation from days 10-42 of 82.5-84.7% XL ------- *** Proposal Draft - Do Not Cite, Quote or Release During the Review*** 4940424 CO2 evolution and BOD 64 days Dose: 50.3 DOC removal Methods: removal mg/L showed 23.6+/-0.3% degradation after 64 days CO2 evolution showed 17.3+/-2.6% degradation after 62 days • Test substance reported as CAS RN 25265-71 -8 • Purity: 99.4% • OECD Guideline 306 • GLP compliance not reported 4940437 Toxicity to 3 hours Doses: 10, 32, NOEC: 1000 Methods: microorganisms 100, 320 and 1000 mg/L mg/L • Test substance reported as CASRN 24800-44-0 • Purity: 99.9% • OECD Guideline 209 • GLP compliant Results: • EC50 >1000 mg/L (nominal) 4940441 Toxicity to 18 hours Doses: EC10 > 1000 Methods: microorganisms Range Finding: 0.1,1,100, and 1000 mg/L Main study: 1.95, 3.91, mg/L • Test substance reported as CAS RN 25265-71 -8 • Purity: 99.9% • GLP compliant 7.81, 15.63, 31.25, 62.5, 125, 250, 500, and 1000 mg/L Environmental Fate: Modelled Model Data Type Endpoint Predicted Endpoint Notes EPISuite v.4.11 Estimated BAF 0.9 EPISuite v.4.11 Estimated BCF 3.16 EPISuite v.4.11 (BIOWIN 7) Estimated Anaerobic biodegradation Not predicted to biodegrade quickly Probability of 0.4055. Fragment representation is valid. Fast degradation is defined as predicted probability >0.5. under anaerobic conditions XLI ------- *** Proposal Draft - Do Not Cite, Quote or Release During the Review*** B.1 References: Bates. HK; Price. CJ; Marr. MC; Myers. CB; Heindel. JJ; Schwetz. BA. (1992a). Final report on the developmental toxicity of dipropylene glycol (CAS #25265-71-8) in New Zealand white rabbits. (NTP Study No. TER-90-14). Research Triangle Park, NC: National Toxicology Program. Bates. HK; Price. CJ; Marr. MC; Myers. CB; Heindel. JJ; Schwetz. BA. (1992b). Final report on the developmental toxicity of dipropylene glycol (CAS No. 25265-71-8) in Sprague-Dawley (CD (trade name)) rats. Research Triangle Park, NC: National Toxicology Program. BUA (GDCh Advisory Committee on Existing Chemicals). (1996). Dipropylene glycol. In GD BUA (Ed.). Stuttgart, Germany: S. Hirzel. Dow Chemical (Dow Chemical Company). (1994). Determination of the acute oral toxicity of dipropylene glycol in rats with cover letter dated 03/28/94 (sanitized). EC HA (European Chemicals Agency). (1974a). [(methylethylene)bis(oxy)]dipropanol: acute toxicity: dermal. Helsinki, Finland. https://echa.europa.eu/registration-dossier/-/registered- dossier/14788/7/3/4 EC HA (European Chemicals Agency). (1974b). [(methylethylene)bis(oxy)]dipropanol: acute toxicity: inhalation: 001 key | experimental result. Helsinki, Finland, https://ccha.curopa.cu/rcgistration- dossicr/-/rcgistcrcd-dossicr/14788/7/3/3/'.)documcntUUID=b3324441 -49d4-432b-b4fc- 72047a3b05d2 EC HA (European Chemicals Agency). (1974c). [(methylethylene)bis(oxy)]dipropanol: eye irritation: 003 supporting | experimental result. Helsinki, Finland, https://echa.europa.eu/registration-dossier/- /registered-dossier/14788/7/4/3/?documentUUID=93b85621-2813-4cb3-be0f-c81034a5c6ee EC HA (European Chemicals Agency). (1974d). [(methylethylene)bis(oxy)]dipropanol: skin irritation/corrosion. Helsinki, Finland. https://echa.europa.eu/registration-dossier/-/registered- dossier/14788/7/4/2 EC HA (European Chemicals Agency). (1988). Oxydipropanol: genetic toxicity: in vitro: 002 key | experimental result. Helsinki, Finland. https://echa.europa.eu/registration-dossier/-/registered- dossier/16016/7/7/2/?documentUUID=389098d4-4996-4c60-a762-d2b60df89dcc EC HA (European Chemicals Agency). (1990a). Oxydipropanol: developmental toxicity/teratogencity: 002 key | experimental result. Helsinki, Finland, https://echa.europa.eu/registration-dossier/- /registered-dossier/16016/7/9/3/?documentUUID=996f3dc0-f578-45ab-9a89-b92637f28c00 EC HA (European Chemicals Agency). (1990b). Oxydipropanol: developmental toxicity/teratogenicity: 001 key | experimental result. Helsinki, Finland, https://echa.europa.eu/registration-dossier/- /registered-dossier/16016/7/9/3 EC HA (European Chemicals Agency). (1991a). [(methylethylene)bis(oxy)]dipropanol: biodegradation in water: screening tests: 004 supporting | experimental result, https://echa.europa.eu/registration- dossier/-/registered-dossier/14788/5/3/2/?documentUUID=caad96d0-3b36-4255-9bd2- 0e2da25ee91e XLII ------- *** Proposal Draft - Do Not Cite, Quote or Release During the Review*** EC HA (European Chemicals Agency). (1991b). [(methylethylene)bis(oxy)]dipropanol: biodegradation in water: screening tests: 005 supporting | experimental result. Helsinki, Finland. https://echa.europa.eu/registration-dossier/-/registered- dossier/14788/5/3/2/?documentUUID=00f8fa90-fc45-491e-b488-434e42981995 EC HA (European Chemicals Agency). (1992a). Oxydipropanol: genetic toxicity: in vitro: 003 supporting | experimental result. Helsinki, Finland. https://ccha.ciiropa.cu/rcgistration-dossicr/-/registered- dossier/16016/7/7/2/'MocumcntUUID=9d24f 12c-Ibffl-4481-8ac5-c7640975c049 EC HA (European Chemicals Agency). (1992b). Oxydipropanol: toxicity to microorganisms. Helsinki, Finland. https://echa.europa.eu/registration-dossier/-/registered-dossier/16016/6/2/8 EC HA (European Chemicals Agency). (1993a). [(methylethylene)bis(oxy)]dipropanol: biodegradation in water: screening tests: 003 supporting | experimental result. Helsinki, Finland. https://echa.europa.eu/registration-dossier/-/registered- dossier/14788/5/3/2/?documentUUID=10b66ef0-9fbb-4f6e-8371-693280a318dl EC HA (European Chemicals Agency). (1993b). [(methylethylene)bis(oxy)]dipropanol: repeated dose toxicity: oral: 002 key | experimental result. Helsinki, Finland, https://echa.europa.eu/registration- dossier/-/registered-dossier/14788/7/6/2/?documentUUID=814b4a8c-4620-4c5c-bf90- b3f8622b63f6 EC HA (European Chemicals Agency). (1994a). [(methylethylene)bis(oxy)]dipropanol: short-term toxicity to aquatic invertebrates: 001 key | experimental result, https://echa.europa.eu/registration- dossier/-/registered-dossier/14788/6/2/4/?documentUUID=e7896c57-46b4-445a-ac8b- 2c4107d544fa ECHA (European Chemicals Agency). (1994b). [(methylethylene)bis(oxy)]dipropanol: short-term toxicity to fish: 001 key | experimental result. Helsinki, Finland. https://echa.europa.eu/registration-dossier/-/registered- dossier/14788/6/2/2/?documentUUID=dd8cb796-a0f9-4d90-8fb2-57a6fe859ffa ECHA (European Chemicals Agency). (1994c). Oxydipropanol: biodegradation in water: screening tests: 003 supporting | experimental result. Helsinki, Finland, https://echa.europa.eu/registration- dossier/-/registered-dossier/16016/5/3/2/?documentUUID=4dl6933c-e52a-4975-8416- 9c9534d5eal9 ECHA (European Chemicals Agency). (1995a). [(methylethylene)bis(oxy)]dipropanol: basic toxicokinetics: in vivo. Helsinki, Finland. https://echa.europa.eu/registration-dossier/-/registered- dossier/14788/7/2/2 ECHA (European Chemicals Agency). (1995b). [(methylethylene)bis(oxy)]dipropanol: exposure related observations in humans: other data: 001 key | experimental result. Helsinki, Finland. https://echa.europa.eu/registration-dossier/-/registered-dossier/14788/7/ll/6 ECHA (European Chemicals Agency). (1995c). Oxydipropanol: acute toxicity: dermal. Helsinki, Finland. https://echa.europa.eu/registration-dossier/-/registered-dossier/16016/7/3/4 ECHA (European Chemicals Agency). (1995d). Oxydipropanol: acute toxicity: inhalation. Helsinki, Finland. https://echa.europa.eu/registration-dossier/-/registered-dossier/16016/7/3/3 XLIII ------- *** Proposal Draft - Do Not Cite, Quote or Release During the Review*** EC HA (European Chemicals Agency). (1995e). Oxydipropanol: acute toxicity: oral: 001 key | experimental result. Helsinki, Finland. https://echa.europa.eu/registration-dossier/-/registered- dossier/16016/7/3/2/?documentUUID=c8ac713 6-023 8-420c-bdcb-5 7a927cc6023 EC HA (European Chemicals Agency). (1995f). Oxydipropanol: exposure related observation in humans: other data: 001 key | experimental result. Helsinki, Finland, https://ccha.curopa.cu/rcgistration- dossier/-/registered-dossier/16016/7/11/6 EC HA (European Chemicals Agency). (1995g). Oxydipropanol: eye irritation: in vivo. https://echa.europa.eu/registration-dossier/-/registered-dossier/16016/7/4/3 EC HA (European Chemicals Agency). (1995h). Oxydipropanol: sensitisation data (human). Helsinki, Finland. https://echa.europa.eu/registration-dossier/-/registered-dossier/16016/7/11/5 EC HA (European Chemicals Agency). (1995i). Oxydipropanol: short-term toxicity to aquatic invertebrates: 002 supporting | experimental result, https://echa.europa.eu/registration-dossier/- /registered-dossier/16016/6/2/4/?documentUUID=22a63c82-fala-4621-9cf5-2fb6efdfc6a3 EC HA (European Chemicals Agency). (1995j). Oxydipropanol: skin irritation/corrosion: in vivo. Helsinki, Finland. https://echa.europa.eu/registration-dossier/-/registered-dossier/16016/7/4/2 EC HA (European Chemicals Agency). (1995k). Oxydipropanol: skin sensitisation: in vivo (non-LLNA). https://echa.europa.eu/registration-dossier/-/registered-dossier/16016/7/5/2 EC HA (European Chemicals Agency). (1997). [(methylethylene)bis(oxy)]dipropanol: exposure related observations in humans: other data: 002 key | experimental result. https://echa.europa.eu/registration-dossier/-/registered- dossier/14788/7/1 l/6/?documentUUID=ca6dcade-09d9-479c-b79c-dccdc9d4493 7 EC HA (European Chemicals Agency). (1999). Oxydipropanol: genetic toxicity: in vivo. https://echa.europa.eu/registration-dossier/-/registered-dossier/16016/7/7/3 EC HA (European Chemicals Agency). (2002). Oxydipropanol: short-term toxicity to aquatic invertebrates: 001 key | experimental result, https://echa.europa.eu/registration-dossier/- /registered-dossier/16016/6/2/4 EC HA (European Chemicals Agency). (2004a). Oxydipropanol: carcinogenicity: oral. Helsinki, Finland. https://echa.europa.eu/registration-dossier/-/registered- dossier/16016/7/8/? documentUUID=22067ce9-4d3f-474a-a0eb-e0466eaa8a37 EC HA (European Chemicals Agency). (2004b). Oxydipropanol: carcinogenicity: oral: 001 key | experimental result. https://echa.europa.eu/registration-dossier/-/registered-dossier/l6016/7/8 EC HA (European Chemicals Agency). (2004c). Oxydipropanol: genetic toxicity: in vitro: 001 key | experimental result. Helsinki, Finland. https://echa.europa.eu/registration-dossier/-/registered- dossier/16016/7/7/2/?documentUUID=74e59391-4529-4883-958e-083dla25594e XLIV ------- *** Proposal Draft - Do Not Cite, Quote or Release During the Review*** EC HA (European Chemicals Agency). (2004d). Oxydipropanol: repeated dose toxicity: oral: 001 key | experimental result. Helsinki, Finland. https://echa.europa.eu/registration-dossier/-/registered- dossier/16016/7/6/2 EC HA (European Chemicals Agency). (2004e). Oxydipropanol: repeated dose toxicity: oral: 002 supporting | experimental result. Helsinki, Finland, https://echa.europa.eu/registration-dossier/- /registered-dossier/16016/7/6/2/?documentUUID=9b888e96-d05d-4451-9709-64fabae21fbc EC HA (European Chemicals Agency). (2004f). Oxydipropanol: repeated dose toxicity: oral: 003 supporting | experimental result. https://echa.europa.eu/registration-dossier/-/registered- dossier/16016/7/6/2/?documentUUID=9796c071 -d03 9-468a-b2f1 -0493 5 82fdc5 0 EC HA (European Chemicals Agency). (2004g). Oxydipropanol: repeated dose toxicity: oral: 004 supporting | experimental result. https://echa.europa.eu/registration-dossier/-/registered- dossier/16016/7/6/2/?documentUUID=aeb50875-5f7d-41e6-802b-de9b618599ec EC HA (European Chemicals Agency). (2007a). [(methylethylene)bis(oxy)]dipropanol: biodegradation in water: screening tests: 001 key | experimental result. Helsinki, Finland. https://echa.europa.eu/registration-dossier/-/registered- dossier/14788/5/3/2/?documentUUID=bf8b2f2f-7880-495b-adle-7a003f2c96c7 EC HA (European Chemicals Agency). (2007b). [(methylethylene)bis(oxy)]dipropanol: dermal absorption in vitro/ex vivo. https://echa.europa.eu/registration-dossier/-/registered-dossier/14788/7/2/3 EC HA (European Chemicals Agency). (2007c). Oxydipropanol: biodegradation in water: screening tests: 001 key | experimental result. Helsinki, Finland, https://echa.europa.eu/registration-dossier/- /registered-dossier/16016/5/3/2 EC HA (European Chemicals Agency). (2007d). Oxydipropanol: biodegradation in water: screening tests: 002 key | experimental result. https://echa.europa.eu/registration-dossier/-/registered- dossier/16016/5/3/2/?documentUUID=625 02e63 -7f7b-4797-aaba-87666cb5 7def EC HA (European Chemicals Agency). (2010a). [(methylethylene)bis(oxy)]dipropanol: eye irritation: 001 key | experimental result. Helsinki, Finland, https://echa.europa.eu/registration-dossier/- /registered-dossier/1478 8/7/4/3 EC HA (European Chemicals Agency). (2010b). [(methylethylene)bis(oxy)]dipropanol: eye irritation: 002 key | experimental result. https://echa.europa.eu/registration-dossier/-/registered- dossier/14788/7/4/3/?documentUUID=6112967b-d401-4691-92fc-cl090a4e63c5 EC HA (European Chemicals Agency). (2010c). [(methylethylene)bis(oxy)]dipropanol: toxicity to microorganisms: 001 key | experimental result. Helsinki, Finland. https://echa.europa.eu/registration-dossier/-/registered- dossier/14788/6/2/8/?documentUUID=95e7699a-lff8-4acc-a8f6-fba87bb72c52 Fasano. WJ. (2007). Dipropylene glycol: in vitro dermal absorption rate testing [TSCA Submission], Fasano, WJ. https://chemview.epa.gov/chemview/proxv?filename=2008-l-8EHQ-08- 16930B 8ehq 0108 16930b.pdf XLV ------- *** Proposal Draft - Do Not Cite, Quote or Release During the Review*** Fasano. WJ; ten Bcrgc. W; Banton. MI; Heneweer. M; Moore. NP. (2011). Dermal penetration of propylene glycols: Measured absorption across human abdominal skin in vitro and comparison with a QSAR model. Toxicol In Vitro 25: 1664-1670. http://dx.doi.Org/10.1016/i.tiv.2011.07.003 Johansen. JD; Jemec. GBE; Rastogi. SC. (1995). Contact sensitization to dipropylene glycol in an eczema population [Abstract]. Contact Derm 33: 211-212. http://dx.doi.org/10.1111/i.1600- 0536.1995 ,tb00560.x Leberco Labs (Leberco Laboratories). (1994). Letter from [] to usepa submitting irritation toxicity studies of 2-propanol, l,l'-oxybis- in the rabbit dated 03/24/94 (sanitized). (86940000234S). NTP (National Toxicology Program). (2004). NTP technical report on the toxicology and carcinogenesis studies of dipropylene glycol (CAS NO. 25265-71-8) in F344/N rats and B6C3F1 mice (pp. 6- 260). Research Triangle Park, NC: U.S Department of Health and Human Services. Public Health Service. National Institutes of Health, https://ntp.niehs.nih.gov/ntp/htdocs/lt rpts/tr511 .pdf OECD (Organisation for Economic Co-operation and Development). (1994). SIDS Initial Assessment Report for SIAM 2 (Paris, 4-6 July 1994)Tripropylene glycol: CAS No: 24800-440. https://hpvchemicals.oecd.org/UI/handler.axd?id=00205ec6-f694-448b-bbb2-be4121e9a7fe OECD (Organisation for Economic Co-operation and Development). (2001). Dipropylene glycol (mixed isomers and dominant isomer Cas No: 25265-71-8 and 110-98-5). http://www.inchem.org/documents/sids/sids/25265-71-8.pdf Union Carbide (Union Carbide Corporation). (1994). Letter from union carbide corp to usepa regarding toxicity studies of various chemicals referenced in 40 cfr part 716, 58 fed reg 68311-68322 (12/27/93) w/attchmts dated 04/26/94. (TSCATS/442947 OTS0557477). XLVI ------- *** Proposal Draft - Do Not Cite, Quote or Release During the Review*** Appendix C: Literature Search Outcomes C.1 Literature Search and Review This section briefly describes the literature search and review process, search terms, and search outcomes for the hazard and fate screening of l,r-dimethyldiethylene glycol. Search outcomes and reference details are provided on the candidate's HERO34 project page. EPA created a fit-for-purpose process to transparently document the literature search and review35 of available hazard and fate information for low-priority substance (LPS) candidates. References from peer- reviewed primary sources, grey sources,36 and other sources were identified, screened at the title/abstract and full-text level, and evaluated for data quality based on discipline-specific criteria. An overview of the literature search and review process is illustrated in Figure C1. Figure C.l: Overview of the Literature Search and Review Process References available at title/abstract screening References available at data quality evaluation References included in LPS screening reviews References available at full text screening References excluded at full text screening References excluded at data quality evaluation References excluded at title/abstract screening References available from grey literature and other sources References available from primary peer- reviewed sources C.1.1 Search for Analog Data To supplement the information on the candidate chemical, l,r-dimethyldiethylene glycol, the following LPS candidates were used as analogs for read-across: tripropylene glycol (CASRN 24800-44-0) and dipropylene glycol (CASRN 25265-71-8). For more details and justification on analogs, see section 6.1.1. Analogs were used to fill data gaps on endpoints for which l,r-dimethyldiethylene glycol lacked quality data, such as repeated dose and developmental toxicity, and to add to the weight of the scientific evidence. Analog references were searched, screened and evaluated using the same process as references 34 The HERO low-priority substance candidate project pages are accessible to the public at https://hero.epa. go v/hero/. 35 Discussed in the document "Approach Document for Screening Hazard Information for Low-Priority Substances Under TSCA." 30 Grey literature and additional sources are the broad category of studies not found in standard, peer-reviewed literature database searches. This includes U.S. and international government agency websites, non-government organization (NGO) websites, and data sources that are difficult to find, or are not included, in the peer-reviewed databases, such as white papers, conference proceedings, technical reports, reference books, dissertations, and information on various stakeholder websites. XLVII ------- *** Proposal Draft - Do Not Cite, Quote or Release During the Review*** on l,r-dimethyldiethylene glycol described above.35 l,r-Dimethyldiethylene glycol and the two analogs mentioned above fall under the glycol cluster in HERO. C.1.2 Search Terms and Results EPA began the literature review process for the hazard screening of l,r-dimethyldiethylene glycol by developing search terms. To gather publicly available information, specific search terms were applied for each discipline and across databases and grey literature sources. Table C.l lists the search terms used in the database search of peer -reviewed literature for the glycol cluster including l,r-dimethyldiethylene glycol. For grey literature and other secondary sources, Table C.2 lists the search terms used for the glycols cluster. XLVIII ------- *** Proposal Draft - Do Not Cite, Quote or Release During the Review*** Table C.1: Search Terms Used in Peer-Reviewed Databases Discipline Database Search terms Human Health PubMed 25265-71-8[rn] OR 110-98-5[rn] OR 24800-44-0[rn] OR "((1 -methyl-1,2-ethanediyl)bis(oxy))bispropanol"[tw] OR "((Methylethylene)bis(oxy))dipropanol"[tw] OR "1,1 '-Dimethyldiethylene glycol"[tw] OR "1,1'-Oxybis(2-propanol)"[tw] OR "1,1- Oxybis-2-propanol"[tw] OR "1,1'-Oxydi-2-propanol"[tw] OR "1,1'-Oxydipropan-2-ol"[tw] OR "2,2'-Dihydroxydipropyl ether"[tw] OR "2-(2-(2-Hydroxypropoxy)propoxy)-1-propanol"[tw] OR "2-Propanol, 1,1'-oxybis-"[tw] OR "2-Propanol, 1,1'-oxydi-"[tw] OR"4-Oxa- 2,6-heptandiol"[tw] OR "4-Oxaheptane-2,6-diol"[tw] OR "ADK DPG-RF"[tw] OR "Bis(2-hydroxypropyl) ether"[tw] OR "Bis(3- hydroxypropyl)ether"[tw] OR "Diisopropylene glycol"[tw] OR "Dipropylene glycol"[tw] OR "DIPROPYLENEGLYCOL"[tw] OR "DIPROPYLENGLYKOL"[tw] OR "Dowanol DPG"[tw] OR "DPG-FC"[tw] OR "DPG-RF"[tw] OR "NIAX catalyst D-19"[tw] OR "oxidipropanol"[tw] OR "Oxybispropanol"[tw] OR "Oxydipropanol"[tw] OR "Propanol, ((1-methyl-1,2-ethanediyl)bis(oxy))bis-"[tw] OR "Propanol, oxybis-"[tw] OR "Tripropylene glycol"[tw] Toxline (25265-71-8[rn] OR 110-98-5[rn] OR 24800-44-0[rn] OR "((1-methyl-1,2-ethanediyl)bis(oxy))bispropanol" OR "((Methylethylene)bis(oxy))dipropanol" OR "1,1 '-Dimethyldiethylene glycol" OR "1,1'-Oxybis(2-propanol)" OR "1,1 '-Oxybis-2- propanol" OR "1,1'-Oxydi-2-propanol" OR "1,1'-Oxydipropan-2-ol" OR "2,2-Dihydroxydipropyl ether" OR "2-(2-(2- Hydroxypropoxy)propoxy)-1-propanol" OR "2-Propanol, 1,1-oxybis-" OR "2-Propanol, 1,1-oxydi-" OR "4-Oxa-2,6-heptandiol" OR "4-Oxaheptane-2,6-diol" OR "ADK DPG-RF" OR "Bis(2-hydroxypropyl) ether" OR "Bis(3-hydroxypropyl)ether" OR "Diisopropylene glycol" OR "Dipropylene glycol" OR "DIPROPYLENEGLYCOL" OR "DIPROPYLENGLYKOL" OR "Dowanol DPG" OR "DPG-FC" OR "DPG-RF" OR "NIAX catalyst D-19" OR "oxidipropanol" OR "Oxybispropanol" OR "Oxydipropanol" OR "Propanol, ((1-methyl-1,2-ethanediyl)bis(oxy))bis-" OR "Propanol, oxybis-" OR "Tripropylene glycol") AND (ANEUPL [org] OR BIOSIS [org] OR CIS [org] OR DART [org] OR EMIC [org] OR EPIDEM [org] OR FEDRIP [org] OR HEEP [org] OR HMTC [org] OR I PA [org] OR RISKLINE [org] OR MTGABS [org] OR NIOSH [org] OR NTIS [org] OR PESTAB [org] OR PPBIB [org]) AND NOT PubMed [org] AND NOT pubdart [org] TSCATS1 (25265-71-8 [rn] OR 110-98-5 [rn] OR 24800-44-0 [rn]) AND (TSCATS [org]) AND NOT PubMed [org] AND NOT pubdart [org] WOS TS=("25265-71-8" OR "110-98-5" OR "24800-44-0" OR "((1-methyl-1,2-ethanediyl)bis(oxy))bispropanol" OR "((Methylethylene)bis(oxy))dipropanol" OR "1,1 '-Dimethyldiethylene glycol" OR "1,1'-Oxybis(2-propanol)" OR "1,1 '-Oxybis-2- propanol" OR "1,1 '-Oxydi-2-propanol" OR "1,1 '-Oxydipropan-2-ol" OR "2,2- Di hydroxydipropyl ether" OR "2-(2-(2- Hydroxypropoxy)propoxy)-1-propanol" OR "2-Propanol, 1,1-oxybis-" OR "2-Propanol, 1,1 -oxydi-" OR "4-Oxa-2,6-heptandiol" OR "4-Oxaheptane-2,6-diol" OR "ADK DPG-RF" OR "Bis(2-hydroxypropyl) ether" OR "Bis(3-hydroxypropyl)ether" OR "Diisopropylene glycol" OR "Dipropylene glycol" OR "DIPROPYLENEGLYCOL" OR "DIPROPYLENGLYKOL" OR "Dowanol DPG" OR "DPG-FC" OR "DPG-RF" OR "NIAX catalyst D-19" OR "oxidipropanol" OR "Oxybispropanol" OR "Oxydipropanol" OR "Propanol, ((1 - methyl-1,2-ethanediy l)bis(oxy) )bi s-" OR "Propanol, oxybis-" OR "Tripropylene glycol") lndexes=SCI-EXPANDED, CPCI-S, CPCI-SSH, BKCI-S, BKCI-SSH, CCR-EXPANDED, IC Timespan=AII years XLIX ------- *** Proposal Draft - Do Not Cite, Quote or Release During the Review*** Table C.1: Search Terms Used in Peer-Reviewed Databases Environmental Hazard WOS Same as human health strategy synonyms only Toxline Same as human health strategy synonyms only TSCATS1 Same as human health strategy CASRN only Proquest TITLE=("25265-71-8" OR "1,1'-Oxybis 2-propanol" OR "1,1 '-Oxybis-2-propanol" OR "1,1 '-Oxydi-2-propanol" OR "1,1'- Oxydipropan-2-ol" OR "2-Propanol, 1,1-oxybis-" OR "Bis 2-hydroxypropyl ether" OR "Dipropylene glycol" OR "DIPROPYLENEGLYCOL" OR "Propanol, oxybis-" OR "Tripropylene glycol") ABSTRACT=("25265-71 -8" OR "1,1'-Oxybis 2-propanol" OR "1,1 '-Oxybis-2-propanol" OR "1,1 '-Oxydi-2-propanol" OR "1,1'- Oxydipropan-2-ol" OR "2-Propanol, 1,1-oxybis-" OR "Bis 2-hydroxypropyl ether" OR "Dipropylene glycol" OR "DIPROPYLENEGLYCOL" OR "Propanol, oxybis-" OR "Tripropylene glycol") SUBJECT=("25265-71 -8" OR "1,1'-Oxybis 2-propanol" OR "1,1 '-Oxybis-2-propanol" OR "1,1 '-Oxydi-2-propanol" OR "1,1'- Oxydipropan-2-ol" OR "2-Propanol, 1,1-oxybis-" OR "Bis 2-hydroxypropyl ether" OR "Dipropylene glycol" OR "DIPROPYLENEGLYCOL" OR "Propanol, oxybis-" OR "Tripropylene glycol") ("110-98-5" OR "24800-44-0" OR" 1 -methyl-1,2-ethanediyl bis oxy bispropanol" OR "Methylethylene bis oxy dipropanol" OR "1,1'- Dimethyldiethylene glycol" OR "2,2'-Dihydroxydipropyl ether" OR "2- 2- 2-Hydroxypropoxy propoxy -1-propanol" OR "2-Propanol, 1,1 '-oxydi-" OR "4-Oxa-2,6-heptandiol" OR "4-Oxaheptane-2,6-diol" OR "ADK DPG-RF" OR "Bis 3-hydroxypropyl ether" OR "Diisopropylene glycol" OR "DIPROPYLENGLYKOL" OR "Dowanol DPG" OR "DPG-FC" OR "DPG-RF" OR "NIAX catalyst D-19" OR "oxidipropanol" OR "Oxybispropanol" OR "Oxydipropanol" OR "Propanol, 1 -methyl-1,2-ethanediyl bis oxy bis-") Fate WOS Same as human health strategy synonyms only Table C.2: Search Terms Used in Grey Literature and Additional Sources Chemical Search terms Glycol cluster (1,1'- Dimethyldiethylene glycol; dipropylene glycol, tripropylene glycol) Searched asastring or individually depending on resource: "25265-71-8" OR "110-98-5" OR "24800-44-0" OR "Dipropylene glycol" OR "Dipropyleneglycol" OR "Propanol, oxybis-" OR "Tripropylene glycol" After the search terms were applied, more than 620 references returned by all search efforts across peer-reviewed databases and grey literature sources. The total number of references include database results, additional strategies, and analog searches. All references from the search efforts were screened and evaluated through the LPS literature search and review process.35 Of these, 71 references were included for data evaluation and L ------- *** Proposal Draft - Do Not Cite, Quote or Release During the Review*** used to support the designation of l,r-dimethyldiethylene glycol as LPS. The included hazard and fate references are listed in the bibliography of Appendix B. C.2 Excluded Studies and Rationale This section lists the excluded references, by HERO ID, found to be off-topic or unacceptable for use in the hazard screening of 1.1 dimethyldiethylene glycol. The excluded references are organized by discipline (human health hazard, environmental hazard, and fate), presented along with a rationale based on exclusion criteria. The criteria35 was used to determine off-topic references in the title/abstract or full-text screening and to determine unacceptable references in the data quality evaluation are provided in the form of questions. C.2.1 Human Health Hazard Excluded References For the screening review of 1,1"-dimethyldiethylene glycol, EPA excluded a total of 539 references when assessing human health hazard. Off- topic references (e.g., studies that did not contain information relevant to human health) were excluded at either title/abstract screening (see Table C.3), or full-text screening (see Table C.4). Unacceptable references (e.g., studies that did not meet data quality metrics) were excluded at full-text screening (see Tables C.5 and C.6). Off-topic and unacceptable references are displayed next to the corresponding exclusion criteria. Table C.3: Off-Topic References Excluded at Title/Abstract Screening for Human Health Hazard Reference excluded (HERO ID) because the reference did NOT contain information needs37 relevant to human health hazard 33975 4949055 4948960 4947155 4705492 1201178 4949084 4948984 4948886 4946188 44187 4949056 4948961 4947156 4706833 1204953 4949085 4948985 4948887 4946189 404898 4949058 4948962 4947159 4738360 1249186 4949086 4948986 4948890 4946190 628230 4949060 4948963 4947160 4738993 1254062 4949087 4948988 4948891 4946193 628727 4949061 4948964 4947161 4742957 1314113 4949089 4948989 4948892 4946194 635083 4949063 4948965 4947175 4828940 1316100 4949090 4948990 4948893 4946210 744085 4949064 4948966 4947177 4828943 1321888 4949092 4948991 4948894 4946247 789593 4949065 4948967 4947178 4847997 1458307 4949094 4948992 4948895 4946257 37 The information needs for human health hazard includes a list of study characteristics pertaining to the study population/test organism, types of exposures and routes, use of controls, type and level of effects. A complete list of the information needs is provided in Table A1 of the "Approach Document for Screening Hazard Information for Low- Priority Substances Under TSCA." These information needs helped guide the development of questions for title/abstract and full-text screening. LI ------- *** Proposal Draft - Do Not Cite, Quote or Release During the Review*** Table C.3: Off-Topic References Excluded at Title/Abstract Screening for Human Health Hazard 789651 4949066 4948968 4947179 4853443 1496934 4949095 4948993 4948896 4946258 926985 4949067 4948969 4947182 4909646 1549118 4949096 4948994 4948898 4946259 992939 4949068 4948970 4947185 4940595 1580047 4949098 4948995 4948899 4946263 1058389 4949070 4948971 4947187 4940694 1611582 4949099 4948996 4948900 4946320 1058433 4949071 4948972 4947189 4940855 1612753 4949100 4948997 4948902 4946322 1112905 4949072 4948974 4947194 4941419 1615034 4949102 4948998 4948904 4946324 1124442 4949074 4948975 4947200 4945941 1689217 4949103 4948999 4948905 4946329 1124901 4949075 4948977 4947201 4946008 1763085 4949104 4949000 4948906 4946359 1142139 4949076 4948978 4947202 4946061 1763087 4949105 4949001 4948909 4946360 1153582 4949078 4948979 4947203 4946132 1763125 4949106 4949002 4948911 4946361 1156301 4949080 4948980 4947204 4946147 1763137 4949108 4949003 4948912 4946374 1167387 4949081 4948981 4947223 4946178 1763157 4949109 4949004 4948913 4946375 1201159 4949082 4948982 4947224 4946179 1781960 4949110 4949005 4948914 4946376 1201176 4949083 4948983 4948885 4946180 1808388 4949111 4949006 4948915 4946380 3036899 4949156 4949040 4948950 4947131 1808755 4949112 4949007 4948916 4946387 3037885 4949157 4949042 4948951 4947132 1865871 4949113 4949009 4948918 4946408 3038973 4949158 4949044 4948952 4947135 1955931 4949116 4949010 4948919 4946410 3039406 4949159 4949045 4948953 4947136 1967450 4949117 4949011 4948920 4946411 3039791 4951048 4949046 4948954 4947137 1970619 4949118 4949012 4948921 4946419 3041527 4951050 4949047 4948955 4947138 2231679 4949119 4949013 4948922 4946423 3041622 4951055 4949049 4948956 4947140 2232056 4949120 4949015 4948923 4946506 3041638 4951170 4949051 4948958 4947141 2232422 4949121 4949016 4948925 4946513 3041935 4951176 4949052 4948959 4947154 2232425 4949122 4949017 4948926 4946538 3047394 4951181 4949053 4339757 4576534 2232427 4949123 4949018 4948927 4946547 Lll ------- *** Proposal Draft - Do Not Cite, Quote or Release During the Review*** Table C.3: Off-Topic References Excluded at Title/Abstract Screening for Human Health Hazard 3051635 4951206 4949054 4376725 4579583 2232444 4949126 4949020 4948928 4946614 3051709 4951208 3753956 4388064 4583202 2232562 4949128 4949021 4948930 4946615 3103598 4951228 3823035 4391261 4656492 2273142 4949129 4949022 4948931 4946617 3114932 4428638 3830342 4395587 4660346 2292715 4949130 4949023 4948932 4946619 3115961 4428838 3830898 4398518 4704876 2302957 4949131 4949024 4948933 4946620 3119596 4433785 3846566 4399866 3577212 2530089 4949132 4949026 4948934 4946621 3225794 4436364 3847436 4400649 3577235 2563138 4949134 4949027 4948935 4946623 3374286 4436864 3874693 4404349 3590105 2692340 4949135 4949028 4948936 4947105 3402924 4438060 4146480 4408404 3619406 2745927 4949138 4949029 4948938 4947106 3445046 4438415 4148076 4420372 3625221 2824290 4949140 4949030 4948940 4947107 3476490 4425601 4148079 4420932 4275583 2875983 4949141 4949031 4948942 4947108 3477473 4426820 4168926 4420947 4276472 2883990 4949142 4949032 4948943 4947109 3491334 3559324 4173202 4421954 4423539 2887419 4949149 4949033 4948944 4947110 3539276 3562800 4222683 4948949 4947130 2892020 4949150 4949034 4948946 4947111 3009070 4949153 4949037 4948948 4947115 2978028 4949152 4949035 4948947 4947113 3036268 4949154 4949039 Reference excluded (HERO ID) because the reference primarily contained in silico data N/A. Table C.4: Screening Questions and Off-Topic References Excluded at Full-text Screening for Human Health Hazard Question Off-topic if answer is: References excluded (HERO ID) Does the reference contain information pertaining No 1322754 to a low- priority substance candidate? 1629162 1776453 1875316 2301122 2301139 LIN ------- *** Proposal Draft - Do Not Cite, Quote or Release During the Review*** Table C.4: Screening Questions and Off-Topic References Excluded at Full-text Screening for Human Health Hazard Question Off-topic if answer is: References excluded (HERO ID) 3041082 4219489 4862648 4940454 4941418 4946053 4947114 4951209 61412 824457 1744616 1744618 3039593 4441664 4442235 4862648 4940287 4940288 4940320 4940383 4940385 4940387 4940395 4940392 4946053 4948456 4949088 4951173 4951178 What type of source is this reference? Review article or book chapter that contains only 1004739 citations to primary literature sources 3038211 4940386 4946377 628176 LIV ------- *** Proposal Draft - Do Not Cite, Quote or Release During the Review*** Table C.4: Screening Questions and Off-Topic References Excluded at Full-text Screening for Human Health Hazard Question Off-topic if answer is: References excluded (HERO ID) 3036785 What kind of evidence does this reference primarily contain? In silico studies that DO NOT contain experimental verification N/A. The following question apply to HUMAN evidence only Does the reference report an exposure route that is or is presumed to be by an inhalation, oral, or dermal route? No N/A. Does the reference report both test substance exposure(s) AND related health outcome(s)? No N/A. If the reference reports an exposure to a chemical mixture, are measures of the test substance or related metabolite(s) reported independently of other chemicals? Note: If the paper does not pertain to mixtures, choose "Not Applicable". No 4951213 The following question apply to ANIMAL evidence only Does the reference report an exposure route that is by inhalation, oral, or dermal route? No N/A. Does the reference report both test substance- related exposure(s) AND related health outcome(s)? No N/A. Does the reference report the duration of exposure? No N/A. Does the reference report an exposure to the test substance only (i.e. no mixtures with the exception of aqueous solutions and reasonable impurities and byproducts)? No 4951261 4951218 4951185 1230541 Does the paper report a negative control that is a vehicle control or no treatment control? No38 4951261 38 Except for acute mammalian toxicity and skin and eye irritation studies, where the use of a negative control may not be required (e.g., OECD 403 Acute Inhalation Toxicity Guidelines). LV ------- *** Proposal Draft - Do Not Cite, Quote or Release During the Review*** Table C.4: Screening Questions and Off-Topic References Excluded at Full-text Screening for Human Health Hazard Question Off-topic if answer is: References excluded (HERO ID) The following questions apply to MECHANISTIC/ALTERNATIVE TEST METHODS evidence only Does the reference report a negative control that is a vehicle control or no treatment control? No 3036587 Does the reference report an exposure to the test substance only (i.e. no mixtures with the exception of aqueous solutions and reasonable impurities and byproducts)? No N/A. For genotoxicity studies only: Does the study use a positive control? No 3036587 Table C.5: Data Quality Metrics and Unacceptable References Excluded at Data Quality Evaluation for Human Health Hazard - Animal Data Quality Metric Unacceptable if: References excluded (HERO ID) Metric 1: Test substance identity • The test substance identity cannot be determined from the information provided (e.g., nomenclature was unclear and CASRN or structure were not reported). OR • For mixtures, the components and ratios were not characterized or did not include information that could result in a reasonable approximation of components. N/A. Metric 2: Negative and vehicle controls A concurrent negative control group was not included or reported. OR The reported negative control group was not appropriate (e.g., age/weight of animals differed between control and treated groups). N/A. Metric 3: Positive controls When applicable, an appropriate concurrent positive control (i.e., inducing a positive response) was not used. N/A. LVI ------- *** Proposal Draft - Do Not Cite, Quote or Release During the Review*** Metric 4: Reporting of doses/concentrations Doses/concentrations were not reported and could not be calculated using default or reported estimates of body weight and diet/water intake (e.g., default intake values are not available for pregnant animals). 1763148 3041958 4940388 4940524 4940510 Metric 5: Exposure duration The duration of exposure was not reported. OR The reported exposure duration was not suited to the study type and/or outcome(s) of interest (e.g., <28 days for repeat dose). 4940388 4940389 4941420 4946133 Metric 6: Test animal characteristics The test animal species was not reported. OR The test animal (species, strain, sex, life-stage, source) was not appropriate for the evaluation of the specific outcome(s) of interest (e.g., genetically modified animals, strain was uniquely susceptible or resistant to one or more outcome of interest). 4941420 1763148 4940389 4940388 3041958 4946133 Metric 7: Number of animals per group The number of animals per study group was not reported. OR The number of animals per study group was insufficient to characterize toxicological effects (e.g., 1-2 animals in each group). N/A. Metric 8: Outcome assessment methodology The outcome assessment methodology was not sensitive for the outcome(s) of interest (e.g., evaluation of endpoints outside the critical window of development, a systemic toxicity study that evaluated only grossly observable endpoints, such as clinical signs and mortality, etc.). 1763148 2282271 4940388 4940389 4941420 4946133 Metric 9: Reporting of data Data presentation was inadequate (e.g., the report does not differentiate among findings in multiple exposure groups). OR Major inconsistencies were present in reporting of 4940388 4940524 4941420 2282271 LVII ------- *** Proposal Draft - Do Not Cite, Quote or Release During the Review*** results. 4442235 4940303 4940394 4946044 4940452 Table C.6: Data Quality Metrics and Unacceptable References Excluded at Data Quality Evaluation for Human Health Hazard - In Vitro Data Quality Metric Unacceptable if: References excluded (HERO ID) Metric 1: Test Substance identity The test substance identity or description cannot be determined from the information provided (e.g., nomenclature was unclear and CASRN or structure were not reported). OR For mixtures, the components and ratios were not characterized or did not include information that could result in a reasonable approximation of components. 3039551 Metric 2: Negative controls A concurrent negative control group was not included or reported. OR The reported negative control group was not appropriate (e.g., different cell lines used for controls and test substance exposure). N/A. Metric 3: Positive controls A concurrent positive control or proficiency group was not used. N/A. Metric 4: Assay type The assay type was not reported. OR The assay type was not appropriate for the study type or outcome of interest (e.g., in vitro skin corrosion protocol used for in vitro skin irritation assay). N/A. Metric 5: Reporting of concentration The exposure doses/concentrations or amounts of test substance were not reported. N/A. Metric 6: Exposure duration No information on exposure duration(s) was reported. 4940521 4940522 LVIII ------- *** Proposal Draft - Do Not Cite, Quote or Release During the Review*** OR The exposure duration was not appropriate for the study type and/or outcome of interest (e.g., 24 hours exposure for bacterial reverse mutation test). 4940389 2282271 Metric 7: Metabolic activation No information on the characterization and use of a metabolic activation system was reported. OR The exposure duration was not appropriate for the study type and/or outcome of interest (e.g., 24 hours exposure for bacterial reverse mutation test). N/A. Metric 8: Test model The test model was not reported OR The test model was not routinely used for evaluation of the specific outcome of interest. N/A. Metric 9: Outcome assessment methodology The outcome assessment methodology was not reported. OR The assessment methodology was not appropriate for the outcome(s) of interest (e.g., cells were evaluated for chromosomal aberrations immediately after exposure to the test substance instead of after post-exposure incubation period). 4940451 4940388 C.2.2 Environmental Hazard For the screening review of LPS candidate l,r-dimethyldiethylene glycol, EPA excluded a total of 547 references when assessing environmental hazard. Off-topic environmental hazard references excluded at title/abstract screening are listed in Table C.7, and those excluded at full-text screening are listed in Table C.8. References in Table C.9 represent unacceptable studies based on specific data quality metrics for environmental hazard. Off-topic and unacceptable references are displayed next to the corresponding exclusion criteria. LIX ------- *** Proposal Draft - Do Not Cite, Quote or Release During the Review*** Table C.7: Off-Topic References Excluded at Title/Abstract Screening for Environmental Hazard Reference excluded (HERO ID) because the reference did NOT contain information needs39 relevant to environmental hazard 44187 4440871 4949112 4948988 4946374 2892020 4738993 1744618 4949052 4948891 404898 4441664 4949113 4948989 4946375 2978028 4742957 1763125 4949053 4948892 635083 4442235 4949116 4948990 4946376 3009070 4828940 1763137 4949054 4948893 744085 4940392 4949117 4948991 4946377 3036268 4828943 1763148 4949055 4948894 789593 4940395 4949118 4948992 4946380 3036587 4847997 1763157 4949056 4948895 789651 4941420 4949119 4948993 4946387 3036785 4853443 1776453 4949058 4948896 824457 4944882 4949120 4948994 4946408 3036899 4862648 1808755 4949060 4948898 926985 4946008 4949121 4948995 4946419 3037885 4909646 2112816 4949061 4948899 1058389 4946016 4949122 4948996 4946513 3038211 4940595 2301122 4949063 4948900 1058433 4946044 4949123 4948997 4946538 3038973 4940694 2301139 4949064 4948902 1112905 4946053 4949126 4948998 4946547 3039406 4940855 2745927 4949065 4948904 1124442 4946054 4949128 4948999 4946614 3039551 4941418 3041082 4949066 4948905 1124901 4946055 4949129 4949001 4946615 3039791 4941419 3041527 4949067 4948906 1142139 4946135 4949130 4949002 4946617 3041935 4945941 3041622 4949068 4948909 1153582 4946142 4949132 4949003 4946619 3114932 4946061 3041638 4949070 4948911 1156301 4946194 4949134 4949004 4946620 3115961 4946132 3103598 4949071 4948912 1167387 4946244 4949135 4949005 4946623 3225794 4946133 3118622 4949072 4948913 1201159 4946247 4949138 4949006 4947105 3374286 4946147 4222683 4949074 4948914 1201176 4946261 4949140 4949007 4947107 3402924 4946178 4259576 4949075 4948915 1201178 4946314 4949141 4949009 4947108 3445046 4946179 4440869 4949076 4948916 1204953 4946316 4949142 4949010 4947109 3476490 4946180 4948954 4949078 4948918 1249186 4946333 4949149 4949011 4947110 3477473 4946188 4948955 4949080 4948919 1321888 4946334 4949150 4949012 4947111 3491334 4946189 4948956 4949081 4948920 1458307 4946361 4949152 4949013 4947113 3539276 4946190 4948958 4949082 4948921 1496934 4946362 4949153 4949015 4947114 3559324 4946191 4948959 4949083 4948922 39 The information needs for environmental hazard includes a list of study characteristics pertaining to the test organism/species, type and level of effects, and use of controls. A complete list of the information needs is provided in Table A2 of the "Approach Document for Screening Hazard Information for Low-Priority Substances Under TSCA." These information needs helped guide the development of questions for title/abstract and full-text screening. LX ------- *** Proposal Draft - Do Not Cite, Quote or Release During the Review*** 1549118 4946363 4949154 4949016 4947115 3562800 4946193 4948960 4949084 4948923 1611582 4946410 4949156 4949017 4947130 3577212 4946210 4948961 4949085 4948925 1612753 4946411 4949157 4949018 4947131 3577235 4946257 4948962 4949086 4948926 1615034 4946412 4949158 4949020 4947132 3590105 4946258 4948963 4949087 4948927 1689217 4946414 4949159 4949021 4947135 3619406 4946259 4948964 4949088 4948928 1781960 4946416 4951181 4949022 4947136 3625221 4946263 4948965 4949089 4948930 1808388 4946420 1763085 4949023 4947137 3753956 4946322 4948966 4949090 4948931 1865871 4946423 1763087 4949024 4947138 3830342 4946324 4948967 4949092 4948932 1875316 4946424 4946320 4949026 4947140 3830898 4946329 4948968 4949094 4948933 1955931 4946506 4949131 4949027 4947141 3846566 4946359 4948969 4949095 4948934 1967450 4946511 992939 4949028 4947155 3847436 4946360 4948970 4949096 4948935 1970619 4946541 3051635 4949029 4947156 3874693 4420932 4948971 4949098 4948936 2231679 4946621 3051709 4949030 4947159 4088550 4420947 4948972 4949099 4948938 2232056 4947224 4951048 4949031 4947160 4146480 4421954 4948974 4949100 4948940 2232422 4948456 2282271 4949032 4947161 4148076 4423539 4948975 4949102 4948942 2232425 4949000 33975 4949033 4947175 4148079 4425601 4948977 4949103 4948943 2232427 4951050 61412 4949034 4947177 4168926 4426820 4948978 4949104 4948944 2232444 4951055 628176 4949035 4947182 4173202 4428638 4948979 4949105 4948946 2232562 4951170 628230 4949037 4947185 4275583 4428838 4948980 4949106 4948947 2273142 4951173 628727 4949039 4947189 4276472 4433785 4948981 4949108 4948948 2292715 4951176 1004739 4949040 4947201 4339757 4436364 4948982 4949109 4948949 2302957 4951185 1230541 4949042 4947202 4376725 4436864 4948983 4949110 4948950 2563138 4951207 1254062 4949044 4947203 4388064 4438060 4948984 4949111 4948951 2692340 4951209 1314113 4949045 4947204 4391261 4438415 4948985 4579583 4948952 2824290 4951213 1316100 4949046 4948885 4395587 4576534 4948986 4583202 4948953 2875983 4951218 1322754 4949047 4948886 4398518 4404349 4705492 4660346 4420372 2883990 4951261 1580047 4949049 4948887 4399866 4408404 4706833 4704876 4400649 2887419 4738360 1629162 4949051 4948890 Reference excluded (HERO ID) because the reference c id NOT presenl quantitative environmental hazard data N/A. LXI ------- *** Proposal Draft - Do Not Cite, Quote or Release During the Review*** Table C.9: Screening Questions and Off-Topic References Excluded at Full-text Screening for Environmental Hazard Question Off-topic if answer is: References excluded (HERO ID) Does the reference contain information pertaining to a low- priority substance candidate? No 1580138 4731313 4851358 4951178 1744616 4940286 4951206 4951228 4940436 4947106 4951208 What type of source is this reference? Review article or book chapter that contains only citations to primary literature sources 4219489 Is quantitative environmental hazard data presented? No N/A. Is this primarily a modeling/simulation study? [Note: select "No" if experimental verification was included in the study] Yes N/A. Is environmental hazard data presented for standard or non-standard aquatic or terrestrial species (fish, invertebrates, microorganisms, non- mammalian terrestrial species)? No N/A. Is exposure measured for the target substance or is the test substance a mixture (except for reasonable impurities, byproducts, and aqueous solutions) or formulated product? Mixture N/A. Formulated Product N/A. Does the reference report a duration of exposure? No N/A. Does the reference report a negative control that is a vehicle control or no treatment control? No 7504 4940435 4940366 4940397 LXII ------- *** Proposal Draft - Do Not Cite, Quote or Release During the Review*** Table C.9: Screening Questions and Off-Topic References Excluded at Full-text Screening for Environmental Hazard Question Off-topic if answer is: References excluded (HERO ID) Does the reference include endpoints in the information needs? No N/A. Table C.9: Data Quality Metrics and Unacceptable References Excluded at Data Quality Evaluation for Environmental Hazard Question Unacceptable if: References excluded (HERO ID) Metric 1: Test Substance Identity The test substance identity or description cannot be determined from the information provided (e.g., nomenclature was unclear, CASRN or structure were not reported, substance name/ description does not match CASRN). OR For mixtures, the components and ratios were not characterized or did not include information that could result in a reasonable approximation of components. N/A. Metric 2: Negative Controls A concurrent negative control group was not included or reported. 4951174 4951208 Metric 3: Experimental System The experimental system (e.g., static, semi-static, or flow-through regime) was not described. 4940436 4940440 4951174 4940388 3041958 Metric 4: Reporting of Concentrations Test concentrations were not reported. 4951174 4951208 Metric 5: Exposure Duration The duration of exposure was not reported. OR The reported exposure duration was not suited to the study type and/or outcome(s) of interest (e.g., study intended to assess effects on reproduction did not expose organisms for an acceptable period of time prior to mating). 4951208 4951174 Metric 6: Test Organism Characteristics The test species was not reported. OR The test species, life stage, or age was not appropriate for the outcome(s) of interest. N/A. LXIII ------- *** Proposal Draft - Do Not Cite, Quote or Release During the Review*** Table C.9: Data Quality Metrics and Unacceptable References Excluded at Data Quality Evaluation for Environmental Hazard Question Unacceptable if: References excluded (HERO ID) Metric 7: Outcome Assessment Methodology The outcome assessment methodology was not reported. N/A. Metric 8: Reporting of Data Data presentation was inadequate. OR Major inconsistencies were present in reporting of results. 4940388 3041958 C.3 Fate For the screening review of LPS candidate l,r-dimethyldiethylene glycol, EPA excluded a total of 453 references when assessing environmental fate. Off-topic fate references excluded at title/abstract screening are listed in Table C. 10, and those excluded at full-text screening are listed in Table C. 11. References in Table C. 12 represent unacceptable studies based on specific data quality metrics for fate. Off-topic and unacceptable references are displayed next to the corresponding exclusion criteria. Table C.10: Off-Topic References Excluded at Initial Screening for Fate Reference excluded (HERO ID' ) because the reference did NOT contain information needs40 relevant to environmental fate 44187 4949033 4948959 4946621 4146480 2232444 4949089 4949005 4948895 4847997 404898 4949034 4948960 4946623 4148076 2232562 4949090 4949006 4948896 4853443 635083 4949035 4948961 4947105 4148079 2273142 4949092 4949007 4948898 4862648 744085 4949037 4948962 4947107 4168926 2292715 4949094 4949009 4948899 4909646 789593 4949039 4948963 4947108 4173202 2302957 4949095 4949010 4948900 4940595 789651 4949040 4948964 4947109 4275583 2563138 4949096 4949011 4948902 4940694 824457 4949042 4948965 4947110 4276472 2692340 4949098 4949012 4948904 4940855 926985 4949044 4948966 4947111 4339757 2824290 4949099 4949013 4948905 4941418 992939 4949045 4948967 4947113 4376725 2875983 4949100 4949015 4948906 4941419 1058389 4949046 4948968 4947114 4388064 2883990 4949102 4949016 4948909 4941420 1058433 4949047 4948969 4947115 4391261 2887419 4949103 4949017 4948911 4945941 40 The information needs for fate includes a list of study characteristics pertaining to the associated media and exposure pathways, associated processes, and use of controls. A complete list of the information needs is provided in Table A3 of the "Approach Document for Screening Hazard Information for Low-Priority Substances Under TSCA." These information needs helped guide the development of questions for title/abstract and full-text screening. LXIV ------- *** Proposal Draft - Do Not Cite, Quote or Release During the Review*** Table C.10: Off-Topic References Excluded at Initial Screening for Fate 1112905 4949049 4948970 4947130 4395587 2892020 4949104 4949018 4948912 4946061 1124442 4949051 4948971 4947131 4398518 2978028 4949105 4949020 4948913 4946132 1124901 4949052 4948972 4947132 4399866 3009070 4949106 4949021 4948914 4946133 1142139 4949053 4948974 4947135 4400649 3036268 4949108 4949022 4948915 4946147 1153582 4949054 4948975 4947136 4404349 3036587 4949109 4949023 4948916 4946178 1156301 4949055 4948977 4947137 4408404 3036785 4949110 4949024 4948918 4946179 1167387 4949056 4948978 4947138 4420372 3036899 4949111 4949026 4948919 4946180 1201159 4949058 4948979 4947140 4420932 3037885 4949112 4949027 4948920 4946188 1201176 4949060 4948980 4947141 4420947 3038211 4949113 4949028 4948921 4946189 1201178 4949061 4948981 4947155 4421954 3038973 4949116 4949029 4948922 4946190 1204953 4949063 4948982 4947156 4423539 3039406 4949117 4949030 4948923 4946191 1249186 4949064 4948983 4947159 4425601 3039551 4949118 4949031 4948925 4946193 1321888 4949065 4948984 4947160 4426820 3039791 4949119 4949032 4948926 4946194 1458307 4949066 4948985 4947161 4428638 3041935 4949120 4946380 4948927 4946210 1496934 4949067 4948986 4947175 4428838 3114932 4949121 4946387 4948928 4946247 1549118 4949068 4948988 4947177 4433785 3115961 4949122 4946408 4948930 4946257 1611582 4949070 4948989 4947182 4436364 3225794 4949123 4946410 4948931 4946258 1612753 4949071 4948990 4947185 4436864 3374286 4949126 4946419 4948932 4946259 1615034 4949072 4948991 4947189 4438060 3402924 4949128 4946506 4948933 4946263 1689217 4949074 4948992 4947201 4438415 3445046 4949129 4946513 4948934 4946322 1781960 4949075 4948993 4947202 4576534 3476490 4949130 4946538 4948935 4946324 1808388 4949076 4948994 4947203 4579583 3477473 4949132 4946547 4948936 4946329 1865871 4949078 4948995 4947204 4583202 3491334 4949134 4946614 4948938 4946359 1875316 4949080 4948996 4947224 4660346 3539276 4949135 4946615 4948940 4946360 1955931 4949081 4948997 4948885 4704876 3559324 4949138 4946617 4948942 4946361 1967450 4949082 4948998 4948886 4705492 3562800 4949140 4946619 4948943 4946374 1970619 4949083 4948999 4948887 4706833 3577212 4949141 4946620 4948944 4946375 2231679 4949084 4949000 4948890 4738360 3577235 4949142 4948952 4948946 4946376 2232056 4949085 4949001 4948891 4738993 3590105 4949149 4948953 4948947 4946377 2232422 4949086 4949002 4948892 4742957 3619406 4949150 4948954 4948948 4949157 2232425 4949087 4949003 4948893 4828940 3625221 4949152 4948955 4948949 4949158 2232427 4949088 4949004 4948894 4828943 3753956 4949153 4948956 4948950 4949159 3830898 4949156 3847436 3874693 4088550 3830342 4949154 4948958 4948951 4951181 3846566 LXV ------- *** Proposal Draft - Do Not Cite, Quote or Release During the Review*** Table C.10: Off-Topic References Excluded at Initial Screening for Fate Reference excluded (HERO ID) because the reference did NOT present quantitative environmental fate data m. Table C.11: Screening Questions and Off-Topic References Excluded at Full-text Screening for Fate Question Off-topic if answer is: References excluded (HERO ID) Does the reference contain information pertaining to a low- priority substance candidate? No 4940397 4940399 4949131 1763087 4940401 What type of source is this reference? Review article or book chapter that contains only citations to primary literature sources N/A. Is quantitative fate data presented? No N/A. Is this primarily a modeling/simulation study? [Note: Select "Yes" only if there is no experimental verification] Yes N/A. Table C.12: Data Quality Metrics and Unacceptable References Excluded at Data Quality Evaluation for Fate Data quality metric Unacceptable if: References excluded (HERO ID) Metric 1: Test substance identity The test substance identity or description cannot be determined from the information provided (e.g., nomenclature was unclear and CASRN or structure were not reported). OR For mixtures, the components and ratios were not characterized or did not include information that could result in a reasonable approximation of components. N/A. Metric 2: Study controls The study did not include or report crucial control groups that consequently made the study unusable (e.g., no positive control for a biodegradation study reporting 0% removal). OR 4940366 4940402 4940404 LXVI ------- *** Proposal Draft - Do Not Cite, Quote or Release During the Review*** Table C.12: Data Quality Metrics and Unacceptable References Excluded at Data Quality Evaluation for Fate Data quality metric Unacceptable if: References excluded (HERO ID) The vehicle used in the study was likely to unduly influence the study results. Metric 3: Test substance stability There were problems with test substance stability, homogeneity, or preparation that had an impact on concentration or dose estimates and interfered with interpretation of study results. 4940404 4940430 Metric 4: Test method suitability The test method was not reported or not suitable for the test substance. OR The test concentrations were not reported. OR The reported test concentrations were not measured, and the nominal concentrations reported greatly exceeded the substances water solubility, which would greatly inhibit meaningful interpretation of the outcomes. 4940402 4940404 Metric 5: Testing conditions Testing conditions were not reported, and the omission would likely have a substantial impact on study results. OR Testing conditions were not appropriate for the method (e.g., a biodegradation study at temperatures that inhibit the microorganisms). 4940366 4940402 4940404 Metric 6: System type and design- partitioning Equilibrium was not established or reported, preventing meaningful interpretation of study results. OR The system type and design (e.g. static, semi-static, and flow-through; sealed, open) were not capable of appropriately maintaining substance concentrations, preventing meaningful interpretation of study results. N/A. LXVII ------- *** Proposal Draft - Do Not Cite, Quote or Release During the Review*** Table C.12: Data Quality Metrics and Unacceptable References Excluded at Data Quality Evaluation for Fate Data quality metric Unacceptable if: References excluded (HERO ID) Metric 7: Test organism-degradation The test organism, species, or inoculum source were not reported, preventing meaningful interpretation of the study results. 4940402 4940430 Metric 8: Test organism-partitioning The test organism information was not reported. OR The test organism is not routinely used and would likely prevent meaningful interpretation of the study results. N/A. Metric 9: Outcome assessment methodology The assessment methodology did not address or report the outcome(s) of interest. 1763085 4940402 4940404 4940388 4940389 Metric 10: Data reporting Insufficient data were reported to evaluate the outcome of interest or to reasonably infer an outcome of interest. OR The analytical method used was not suitable for detection or quantification of the test substance. OR Data indicate that disappearance or transformation of the parent compound was likely due to some other process. N/A. Metric 11: Confounding Variables There were sources of variability and uncertainty in the measurements and statistical techniques or between study groups. 4940402 4940404 4940430 Metric 12: Verification or plausibility of results Reported value was completely inconsistent with reference substance data, related physical chemical properties, or otherwise implausible, suggesting that a serious study deficiency exists (identified or not). 1763085 4940366 4940402 4940404 LXVIII ------- |