Whatman 1851-050 Quartz Microfiber Binder Free Filter, 2.2 Micron, 6.4 s/100mL Flow Rate, Grade QM-A, 5.0cm Diameter (Pack of 100)

Whatman 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 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. Diameter: 5.0cm. 100/Pack. Whatman #: 1851-050.