The Whatman® QM-A Quartz Filters manufactured by Whatman International Ltd. are ideal for air sampling in acidic gases, stacks, flues and aerosols. The low level of alkaline earth metals virtually eliminate "artifact" products of sulfates and nitrates.
Specification
Material: Quartz membrane Packaging: Pack of 25 W × L: 8 × 10 inches Pore size: 2.2 μm
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Whatman® Quartz Filter, Grade QM-H, Circles, Diam. 47 mm, Pack of 50, Whatman International Ltd. (CAT#: STEM-L-5447-LC)