THE ENVIRONMENTAL TECHNOLOGY VERIFICATION
                                 PROGRAM
                              ET/
SEPA
U. S. Er.i,-in>r±i3Lt3l Protection Assicy
                               HRTI
                               INTERNATIONAL
                    ETV JOINT VERIFICATION STATEMENT
    TECHNOLOGY TYPE:

    APPLICATION:


    TECHNOLOGY NAME:

    COMPANY:

    ADDRESS:

    WEB SITE:
    E-MAIL:
BAGHOUSE FILTRATION PRODUCTS

CONTROL OF PM2 5 EMISSIONS BY BAGHOUSE
FILTRATION PRODUCTS

5117 High Durability PPS Laminate Filtration Media

W. L. Gore & Associates, Inc.
101 Lewisville Rd.
Elkton, MD 21922
http: //www. gore. com
stims@wlgore .com
PHONE: 410-506-3348
FAX: 410-398-6624
The U.S. Environmental Protection Agency (EPA) 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. The ETV Program 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.

The ETV Program 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 (QA)
protocols to ensure that data of known and adequate quality are generated and that the results are
defensible.

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The Air Pollution Control Technology Center (APCT Center) is operated by RTI International* (RTI), in
cooperation with EPA's National Risk Management Research Laboratory (NRMRL). The APCT Center
evaluates the  performance of baghouse  filtration  products  (BFPs) used  primarily to control  PM25
emissions (i.e., particles  2.5  um and smaller in  aerodynamic diameter).  This  verification statement
summarizes the test results for W. L. Gore & Associates, Inc.'s 5117 High Durability PPS Laminate
filtration media.

VERIFICATION TEST DESCRIPTION
All tests were performed in accordance  with  the  APCT Center Generic  Verification  Protocol for
Baghouse Filtration Products, available at http://www.epa.gov/etv/pubs/05_vp_bfp.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 and QA, procedures for
product selection, auditing of the test laboratories, and the 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 of PM2 5 through  the test filter. 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 um (average of three impactor runs). All BFPs 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

Baghouses  are air pollution control devices used to control particulate emissions from stationary sources
and are among the technologies evaluated by the APCT Center. Baghouses and their accompanying filter
media have long been one of the  leading particulate control techniques for industrial sources. Increasing
emphasis on higher removal efficiencies has  helped the baghouse to be continually more competitive
when compared to the  other generic PM  control devices  to the point  where the baghouse is now the
control option of choice for most industrial applications. The  development of new and improved filter
media has further enhanced baghouse capability to control  fine PM over an expanded range of industrial
applications.
* RTI International is a trade name of Research Triangle Institute.
"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.

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W. L. Gore & Associates, Inc. provided the following information about their filter media product. The
W. L. Gore & Associates, Inc.  5117 High Durability PPS Laminate is a 16 ounces per square yard
(oz/yd2)  polyphenylene  sulfide  (PPS)   felt  laminated  with   GORE™  Membrane  (expanded
polytetrafluoroethylene, ePTFE). Figure 1 is a photograph of the fabric. Sample material was received as
nine 46 x 91 cm (18 x 36 in.) swatches marked with the manufacturer's model number, year and month of
manufacture, and cake side (the upstream side of the fabric, which is exposed to the particle-laden air on
which the filter cake builds up). Three of the swatches were selected at random for preparing three
circular test specimens 150 mm (5.9 in.) in diameter.
                      W.L.  Gore
                       PC#5117
                       ePTFE  Membrane PPS Felt
       Figure 1.  Photograph of W. L. Gore & Associates, Inc.'s 5117 High Durability
                              PPS Laminate filtration media

VERIFICATION OF PERFORMANCE

Verification testing of the W. L. Gore & Associates, Inc.'s 5117 High Durability PPS Laminate filtration
media was performed during the period of March 28 - April 4, 2012, for standard test conditions at the
test facility of ETS Incorporated, 1401 Municipal Road NW, Roanoke, VA 24012. Test conditions are
listed in  Table 1. The overall  test  results summarized  in Table 2  represent the averages of three
individual tests.

The APCT Center quality manager has reviewed the test results and the quality control (QC) 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  PM2s
concentration, filter outlet total mass concentration,  pressure drop, 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.

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                Table 1. Test Conditions for Baghouse Filtration Products
            Brand/Model: W. L. Gore & Associates, Inc.'s 5117 High Durability
                              PPS Laminate Filtration Media
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 cleaning cycles
• During conditioning period
• During recovery period
Performance test duration
Value
18.4 ± 3.6 g/dscm (8.0 ± 1 .6 gr/dscf)
120±6m/h(6.6±0.3fpm)
1, 000 ±12 Pa (4 ±0.05 in. w.g.)
0.5 ± 0.03 MPa (75 ± 5 psi)
50 ± 5 ms
25 ± 2 °C (77 ± 4 °F)
50 ± 1 0%
5.8 ± 0.3 m3/h (3.4 ± 0.2 cfm)
1.13 ± 0.06 m3/h (0.67 ± 0.03 cfm)
—
10,000 cycles
30 cycles
6h±1 s
Beginning of table description. Table 1 is titled Test Conditions for Baghouse Filtration Products; the
Brand/Model is listed as W. L. Gore & Associates, Inc.'s 5117 High Durability PPS Laminate Filtration
Media. The table describes the test conditions that are specified in the QA/QC requirements for the test;
all conditions were achieved  for this test. The table lists the test parameters in one column and their
values in the next column. The test parameters include such items as the dust concentration, filtration
velocity, flow rates, air temperature and humidity, and the number of cleaning cycles during the test. End
of table description.

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          Table 2.  Baghouse Filtration Product Three-Run Average Test Results
  forW. L. Gore & Associates, Inc.'s 5117 High Durability  PPS Laminate Filtration Media
Verification Parameter
Outlet particle concentration at standard conditions3
PM2 5, g/dscm
(gr/dscf)
Total mass, g/dscmb
(gr/dscf)
Average residual pressure drop (A P), cm w.g. (in. w.g.)
Initial residual A P, cm w.g. (in. w.g.)
Residual A P 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)
<0.0000167C
(<0.0000073)
2.09 (0.82)
2.06 (0.81)
0.07 (0.03)
255
0.13(1.95)
84
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.
c The measured value was determined to be below the detection limit of 0.0000167 grams per cubic meter. The
detection limit is for a 6-hour test and based on VDI 3926.

Beginning of table  description.  Table 2 is titled Baghouse Filtration Product Three-Run Average Test
Results  for W. L. Gore & Associates, Inc.'s 5117 High Durability PPS Laminate Filtration Media. The
table lists the  verified test results for this product. The table lists  the verification parameters in one
column  and their values at the verification test conditions in the next column. The verification parameters
listed include the outlet particle  concentration, the pressure drop characteristics, the filtration cycle time,
the mass gain of the test sample, and number of cycles during the test.  End of table description.

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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.
signed by Cynthia Sonich-Mullin
                                     V27/2012   sisned by Jason Hill
                                     Date
Cynthia Sonich-Mullin
Director
National Risk Management Research Laboratory
Office of Research and Development
United States Environmental Protection Agency
6/27/2012
Date
Jason Hill
Director
Air Pollution Control Technology Center
RTI International
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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