APPENDIX L. FILTER HANDLING AND WEIGHING
Note: The following guidelines are based on the regulations developed for sampling PM2.5.
It is recommended that these guidelines be followed for PM
10
sampling using the PQ100.
Filter Specifications
For exact compliance with EPA procedures for PM2.5, refer to 40 CFR Part 50,
Appendix L, and Section 2.12 of EPA=s Quality Assurance Handbook.
In brief, the filter should have the following characteristics:
Size: Circular, 46.2 mm diameter ∀ 0.25 mm. Medium. Polytetrafluoroethylene
(PTFE Teflon), with integral support ring.
Support ring: Polymethylpentene (PMP) or equivalent inert material,
0.38 ∀ 0.04 mm thick, outer diameter 46.2 mm ∀ 0.25 mm, and a width of
3.68 mm (+0.00 mm, -0.51mm).
Pore size: 2μm as measured by ASTM F316.94.
Filter thickness: 30 to 50 μm.
Maximum pressure drop (clean filter): 30 cm H
2
O column @ 16.67 Lpm clean air
flow.
Maximum moisture pickup: Not more than 10 μg weight increase after 24-hour
exposure to air of 40 percent relative humidity, relative to weight after 24-hour
exposure to air of 35 percent relative humidity.
Collection efficiency: Greater than 99.7 percent, as measured by the DOP test
(ASTM D 2986-91) with 0.3 μm particles at the sampler=s operating face velocity.
Alkalinity: Less than 25 microequivalents/gram of filter, as measured by the guidance
given in reference 2 in section 13.0 of this appendix.
One current source of these filters is Pallflex Products Corp. Of Putnam, CT, USA;
Type TK15-S3M.
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