Air monitoring cassettes are conductive and non-static cassettes used to monitor breathable constituents, such as fibers, silica, metal, and dust. Cassettes are leak-proof and tamper-proof. Durable synthetic housing prevents adherence of particles to cassette walls to ensure more accurate analyses. Cassette filters are available in a variety of formulations including asbestos PCM and TEM, PTFE, PVC, quartz, and PC. All cassettes and filters are assembled and preloaded under stringent quality assurance standards with only the finest quality membrane and support pads.