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PM2.5 Air Monitoring Membrane, PTFE, 46.2 mm with support ring, sequentially numbered PM2.5 air monitoring membranes A highpurity, thin PTFE membrane in a sequentially numbered chemically resistant polypropylene support ring for PM 2.5 ambient air monitoring. Whatman PM 2.5 membranes have low tare mass for accurate gravimetric determinations. The thermally stable design eliminates curling, keeps the membrane flat, and makes the filter robotfriendly. The PM 2.5 PTFE membranes are manufactured under clean room conditions. These chemically resistant, low chemical background filters permit sensitive, interferencefree determinations. No glues or adhesives are used in making these 46.2 mm diameter products. PTFE Filters for EPA PM 2.5 Reference Method. Under the requirements of 40 CFR Part 50, Appendix L, shown below, the manufacturer must perform the following tests as listed. Any filter manufacturer or vendor who sells or offers to sell filters specifically identified for use with this PM 2.5 reference method shall certify that the required number of filters from each lot (0.1% or 10, whichever is greater) of filters offered for sale have been tested as specified for the following tests and meet 90% of each of the design and performance specifications: Loose, surface particle contamination. (drop test – weight loss stability) Temperature Stability. (temperature – weight loss stability). Statement of Conformance

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