United States           oWa, of Pettieidei «nd To«Je Substances
                  Environmental Protection     Office of Pestiade Programs (TS-766CI
                  Agency              Washington, DC 20460
v°/EPA     Pesticide
                 Fact Sheet
                 Name of Chemical:  DANTOCHLOR
                 Reason for Issuance:
                 Date Issued:     ^ 12, 1984
                 Fact Sheet Number:	
                                    2pt.l2,  1984
   1.   Description of chemical

   Generic  Name:  Chlorinated Hydantoin Derivative
   Common name:  1,3-dichloro-5-ethyl-5-methylhydantoin
   Trade name:   Dantochlor
   EPA  Shaughnessy code: 1128826
   Chemical Abstracts Service (CAS) number-
   Year of  initial registration: 1984
   Pesticide  type: Disinfectant (Slimicide.  Algaecide, and
   Bactericide)
   Chemical family: Hydantoins
   U. S. and  foreign producers:  Glyco Inc.

   2.   Use  patterns and formulations

   Application sites: recirculating cooling  water  (Cooling Towers
   and  air  washers)
   Types of formulations: Tablets (Briquettes)
   Types and  Methods of application:  Manual
   Application rates: 0.1 to 0.125 Ib.  per  1000 gal per day=12.90 pprr.
   t'suaj carriers: usually marketed in  concentrated form with other
   reiaiec  chlorinated and brominated hydantoins

   '. .   Science Findings

   Chemical Characteristics:  solid,  white  powder, granules or
   briquettes, slight chlorine odor,  melting point 106-130°c,
   Strong oxidizing agent, corrosive to tissues, and metals,
   capable  of spontaneous reaction with water, organic contaminants.

   Toxicology characteristics:  Major routes of exposure in order
   of toxicological significance.

       Toxicity Category and values for each acute hazard: acute
       Oral-Category 3, Eye Irritation  Category 1, Acute Dermal-
       Category 3. Skin Irritation-Category  1.

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Chronic toxicology resuits
Mutaaenicity no adverse efect was
Cytogenicity shown in these studies
Skin Absorptf n Study for the proposed uses
Exposure Assesment to address risk
Physiological and Biochemical Behavioral Characteristics:
Foliar absorption: N/A
Transolocation? N/A
Mechanism of pesticidal action: Hydrolyses in water to
yield hypochlorous acid, (which is the disinfecting agent)
and hydantoin.
Metabolism and persistence in plants and animals. N/A
Envirora.iental Characteristics:
Absorption and leaching in basic soil types: N/A
Microbial breakdown. N/A
Loss from photodecoinposition and/or volatization: neglible
Bloaccurnulation: N/A
Resultant average persistance: N/A
Ecological Characteristics:
Hazards to fish and wildlife (avian oral and dietary LD 50 ,
fish LC 50 and aquatic invertebrate LC 50 ).
Potential problems related to endangered species: There are
potential risks associated with the use of this product
to aquatic organisms. NPDES permits are required and may
mitigate hazards.
Tolerance assessments: No crop applications
Problems which are known to have occurred with use of the
chemical (e.g., P.I.M.S. data). None
Summary ot Regulatory Position and Rationale:
Use Classification? General Use
formulation or geographical restrictions: not to be
registered for use in Spas, Hot Tubs, and swimming
pools until additional chronic studies are submitted
and accepted.
Unique warning statements required on labels: None

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Regulatory decisions in cases where risk assessments
were conducted, including consideration of benefits:
Benefits èxC eds risks for the use of the product in air
recirculation water washers and cooling towers.
Summary of major data gaps and dates when these major data gaps
are due to be filled: There are rio data gaps for the approved
uses.
Contact person at EPA (A. E. Castillo, 401 M St., SW: Washington.
DC. 20460 TS—767C, 703—557—3964.
DISCLAIMER: The information presented in this Chemical Information
Fact Sheet is for informational purposes only and may not be used
to fulfill data requirements for pesticide registration and re-
registration.

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