Papers for ignition strength measurement

Whatman™ Grade 2 qualitative filter papers have a particle retention of 8 µm, slightly more retentive than Grade 1, and with an equivalent increase in filtration time. The filters are tested according to the procedure detailed in ASTM E 2187-09, Sections 9.3.1 and 9.3.2. The paper meets both the conditioned (26.1 ± 0.5 g, SD < 0.3 g) and dried (24.7 ± 0.5 g, SD < 0.3 g) weight requirements.