Whatman Quartz Microfibre Air Sampling Filters-CYTIVA 1851-865

High purity quartz (SiO2) microfibre filters are used for air sampling in acidic gases, stacks, flues and aerosols, particularly at high temperatures up to 500°C and in PM10 testing. Because of the low level of alkalin earth metals, "artifact" products of sulfates and nitrates (from SO2 and NO2) are virtually eliminated. 8 x 10 in. sheets of QM-A type filters are available sequentially numbered according to EPA standards, and are suitable for most applications; QM-B type filters are for use when double thickness and increased strength and retention is required. QM-B type filters are available only in 8 x 10 in. sheets. Circle filters come 100 Filters/Box. Plain 8 x 10 in. sheets come 25 Filters/Box. Pre-numbered 8 x 10 in. QM-A sheets come 100 Sheets/Box.