THE ENVIRONMENTAL TECHNOLOGY VERIFICATION
PROGRAM jO
ERTI
U.S. Environmental Protection Agency INTERNATIONAL
ETV Joint Verification Statement
TECHNOLOGY TYPE: BAGHOUSE FILTRATION PRODUCTS
APPLICATION: CONTROL OF PM2.5 EMISSIONS BY BAGHOUSE
FILTRATION PRODUCTS
TECHNOLOGY NAME: L3650
COMPANY: W. L. Gore & Associates, Inc.
ADDRESS: 101 Lewisville Road PHONE: (410)392-3300
P.O. ox 1100 FAX: (410) 398-6624
Elkton,MD 21022
WEB SITE: http://www.gore.com
E-MAIL: cpolizzi@wlgore.com
The U.S. Environmental Protection Agency (EPA) has created the Environmental Technology
Verification (ETV) Program to facilitate the deployment of innovative or improved environmental
technologies through performance verification and dissemination of information. The goal of the ETV
Program is to further environmental protection by accelerating the acceptance and use of improved and
cost-effective technologies. ETV seeks to achieve this goal by providing high-quality, peer-reviewed data
on technology performance to those involved in the design, distribution, financing, permitting, purchase,
and use of environmental technologies.
ETV works in partnership with recognized standards and testing organizations; stakeholder groups, which
consist of buyers, vendor organizations, permitters, and other interested parties; and with the full
participation of individual technology developers. The program evaluates the performance of innovative
technologies by developing test plans that are responsive to the needs of stakeholders, conducting field or
laboratory tests (as appropriate), collecting and analyzing data, and preparing peer-reviewed reports. All
evaluations are conducted in accordance with rigorous quality assurance protocols to ensure that data of
known and adequate quality are generated and that the results are defensible.
The Air Pollution Control Technology (APCT) Verification Center is operated by RTI International
(RTI), in cooperation with EPA's National Risk Management Research Laboratory. The APCT
Verification Center evaluates the performance of baghouse filtration products (BFPs) used primarily to
control PM2 5 emissions (particles 2.5 um and smaller in aerodynamic diameter). This verification
statement summarizes the test results for W. L. Gore & Associates, Inc.'s filter fabric L3650.
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W. L. Gore & Associates, Inc.L3650
VERIFICATION TEST DESCRIPTION
All tests were performed in accordance with the APCT Generic Verification Protocol for Baghouse
Filtration Products, available at http://etv.rti.org/apct/pdf/baghouseprotocol.pdf. The protocol is based on
and describes modifications to the equipment and procedures described in Verein Deutscher Ingenieure
(VDI 3926, Part 2), Testing of Filter Media for Cleanable Filters under Operational Conditions,
December 1994. The VDI document is available from Beuth Verlag GmbH, 10772 Berlin, Germany.
The protocol also includes requirements for quality management, quality assurance, procedures for
product selection, auditing of the test laboratories, and test reporting format.
Outlet particle concentrations from a test fabric were measured with an impactor equipped with
appropriate substrates to filter and measure PM2 5 within the dust flow. Outlet particle concentrations
were determined by weighing the mass increase of dust collected in each impactor filter stage and
dividing by the gas volumetric flow through the impactor.
Particle size was measured while injecting the test dust into the air upstream of the baghouse filter
sample. The test dust was dispersed into the flow using a brush-type dust feeder. The particle size
distributions in the air were determined both upstream and downstream of the test filter fabric to provide
accurate results for penetration through the test filter of PM2 5. All tests were performed using a constant
18.4 ± 3.6 g/dscm (8.0 ± 1.6 gr/dscf) loading rate, a 120 ± 6.0 m/h (6.6 ± 0.3 fpm) filtration velocity
[identical to gas-to-cloth ratio (G/C*)], and aluminum oxide test dust with a measured mass mean
aerodynamic diameter maximum of 1.5 urn (average of three impactor runs). All baghouse filtration
products are tested in their initial (i.e., clean) condition.
Each of the three test runs consisted of the following segments:
• Conditioning period - 10,000 rapid-pulse cleaning cycles,
• Recovery period - 30 normal-pulse cleaning cycles,
• Performance test period - 6-hour filter fabric test period with impactor.
VERIFIED TECHNOLOGY DESCRIPTION
The W. L. Gore & Associates, Inc. company provided the following information about their product. The
L3650 is a membrane/fiberglass fabric laminate with a weight of 22 oz/yd2 (746/ g/m2) and used in both
GORE® Filtration Products and PRISTYNE® Filter Media Type 6250**. Figure 1 is a photograph of the
fabric. Sample material was received as nine 46 x 91 cm (18x36 in.) swatches marked with the
manufacturer's model number, year, and month of manufacture, and cake side. Three of the swatches
were selected at random for preparing three test specimens 150 mm (5.9 in.) in diameter.
VERIFICATION OF PERFORMANCE
Verification testing of the W. L. Gore & Associates, Inc., L3650 filter fabric was performed during
October 18-25, 2005, for standard test conditions at the test facility of ETS, Incorporated, 1401
Municipal Road, Roanoke, VA 24012. Test conditions are listed in Table 1. The overall test results
summarized in Table 2 are the averages of three individual tests.
Filtration velocity and gas-to-cloth ratio are used interchangeably and are defined as the gas flow rate divided by
the surface area of the cloth.
"This verification statement was originally written for a GORE-TEX product name. GORE® is the new product
name for GORE-TEX and PRISTYNE® Filter Media Type 6250 was added as it uses the exact same L3650 fabric.
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W. L. Gore & Associates, Inc.L3650
W.L. Gore
PC# L3650
Gore-Tex/Fiberglass
Figure 1. Photograph of W. L. Gore & Associates, Inc.'s L3650 filter fabric
Table 1. Test Conditions for Baghouse Filtration Products Brand/Model:
W. L. Gore & Associates, Inc.'s L3650
Test parameter
Dust concentration
Filtration velocity (G/C)
Pressure loss before cleaning
Tank pressure
Valve opening time
Air temperature
Relative humidity
Total raw gas stream flow rate
Sample gas stream flow rate
Number of filtration cycles
• During conditioning period
During recovery period
Performance test duration
Value
18.4 ± 3.6 g/dscm (8.0 ± 1.6 gr/dscf)
120 ± 6 m/h (6.6 ± 0.3 fpm)
1,000 ± 12 Pa (4 ± 0.05 in. w.g.)
0.5 ± 0.03 MPa (75 + 5 psi)
50 ± 5 ms
25 + 2 °C (78 + 4 °F)
50 ± 10 %
5.8±0.3m3/h(3.4±0.2cfm)
1. 13 ± 0.06 m3/h (0.67 ± 0.03 cfm)
10,000 cycles
30 cycles
6h± Is
111
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W. L. Gore & Associates, Inc.L3650
Table 2. Baghouse Filtration Product Three-run Average Test
Results for W. L. Gore & Associates, Inc.'s Fabric L3650
Verification parameter
Outlet particle concentration at standard conditions3
PM2 5, g/dscm
(gr/dscf)
Total mass, g/dscmb
(gr/dscf)
Average residual pressure drop, cm w.g. (in. w.g.)
Initial residual pressure drop, cm w.g. (in. w.g.)
Residual pressure drop increase, cm w.g. (in. w.g.)
Filtration cycle time, s
Mass gain of test sample filter, g (gr)
Number of cleaning cycles
At verification test
conditions
<0.0000167C
(<0.0000073)
<0.0000167
(<0.0000073)
2.45 (0.96)
2.36(0.93)
0.18(0.07)
251
0.09(1.39)
87
NA = Not applicable - values shown are for three tests.
a Standard conditions: 101.3 kPa (14.7 psia) and 20 °C (68 °F). One or more of the impactor substrate weight
changes for these results were near the reproducibility of the balance.
b Total mass includes the mass of PM2 5 and larger particles that passed through the fabric.
0 The measured value was determined to be below the detection limit of 0.0000167 grams per cubic meter. The
detection limit is for a six-hour test and based on VDI 3926.
The APCT Verification Center quality assurance officer has reviewed the test results and the quality
control data and has concluded that the data quality objectives given in the generic verification protocol
and test/QA plan have been attained.
This verification statement addresses five aspects of filter fabric performance: filter outlet PM2 5
concentration, filter outlet total mass concentration, pressure drop (AP), filtration cycle time, and mass
gain on the filter fabric. Users may wish to consider other performance parameters such as temperature,
service life, and cost when selecting a filter fabric for their application.
In accordance with the generic verification protocol, this verification statement is applicable to filter
media manufactured between the signature date of the verification statement and 3 years thereafter.
IV
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W. L. Gore & Associates, Inc.L3650
signed by Sally Gutierrez 7/28/06 signed by Andrew R. Trenholm 7/20/06
Sally Gutierrez Date Andrew R. Trenholm Date
Director Director
National Risk Management Research Laboratory APCT Verification Center
Office of Research and Development RTI International
United States Environmental Protection Agency
NOTICE: ETV verifications are based on an evaluation of technology performance under specific, predetermined
criteria and the appropriate quality assurance procedures. EPA and RTI make no express or implied warranties as to
the performance of the technology and do not certify that a technology will always operate as verified. The end user
is solely responsible for complying with any and all applicable federal, state, and local requirements. Mention of
commercial product names does not imply endorsement.
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