Plastic center ring for 37mm air monitoring cassettes, 250/pk-PALL 87146

37 mm diameter meets NIOSH and other regulatory requirements for industrial hygiene sampling using vacuum filtration. 0.8 μm GN4 Metricel membrane has a low fiber background count. It is widely accepted for air monitoring of fibers, asbestos fibers, and metals. Choose from two or threepiece units. Disposable after a single use or may be reused. Ideally suited for particulate and air sampling analysis using vacuum filtration. For open or closedface monitoring methods. 37 mm air monitoring cassettes deliver consistent performance for industrial hygiene sampling.