Whatman Filters Quartz Qm-A 47mm Circle 100 Piece Pack

High-purity quartz (SiO2) microfiber filters are used for air sampling in acidic gases, stacks, flues and aerosols, particularly at high temperatures up to 500°C and in PM-10 testing. Because of the low level of alkaline earth metals, 'artifact' products of sulfates and nitrates (from SO2 and NO2) are virtually eliminated. QM-A, sequentially numbered according to EPA standards, is suitable for most applications. Particle Retention in Liquid (µm): 2.2 Air Flow (s/100 mL/in²): 6.4 Typical Thickness (µm): 450 Basis Weight (g/m²): 85