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TE-WILBUR OPERATIONS MANUAL REV 002.22 4/27/2017
Tisch Environmental 1-TSP-AND-PM10 sales@tisch-env.com www.tisch-env.com Page 34 of 185
4.6 Filter and Filter Cassette
The filter specifications for PM2.5 and PM10 sampling are detailed in EPA QA
Guidance Document 2.12 Monitoring PM2.5 in Ambient Air Using Designated
Reference for Class I Equivalent Methods and are as follows:
o Material PTFE Teflon with integral support ring.
o Size- circular 46.2mm diameter +/- 0.25mm (with support ring).
o Support ring Polymethylpentene (PMP) or equivalent inert material,
0.38 ± 0.04mm thickness, outer diameter 46.2 ± 0.25mm, and width of
3.68mm.
o Pore size 2µm as measured by ASTM F 316-94.
o Thickness 30-50µm.
o Maximum pressure drop of a clean filter is 30cm of water column at
16.67 L/min clean air flow.
o Maximum moisture pickup no more than 10µg weight increase after
24 hour exposure to air at 40% RH, relative to the weight after a 24 hour
exposure to air at 35% RH.
o Collection efficiency greater than 99.7% as measured by the dioctyl
phthalate (DOP) test (ASTM 1995c) with 0.3µ m particles at the
sampler’s operating face velocity.
o Filter weight stability (including test for loose, surface-particle
contamination and test for temperature stability) - filter weight loss ≤
20µg in either test, measured as specified in 40CFR Part 50, App. L,
section 6.9.
o Alkalinity less than 25 micro-equivalents/g of filter, as measured in a
procedure based on Appendix A of EPA QA Guidance Document 2.12
Monitoring PM2.5 in Ambient Air Using Designated Reference ro
Class I Equivalent Methods.
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