A wide range of filter membranes, Supports for air quality testing purposes. They offer both preloaded cassettes and individual sampling filter membranes. Their range includes materials such as mixed cellulose ester (MCE), polyvinyl chloride (PVC), polycarbonate track-etch (PCTE), PTFE, silver, glass fiber, and quartz filters. The diameter of the filters ranges from 25 mm to 90 mm, and they also offer 8-by-10-inch sheets. The filters are suitable for various air quality testing purposes such as gravimetric analysis, collecting samples for testing airborne metals, dust, mold, or asbestos, or filters suitable for NIOSH analytical methods. Also provides pre-weighed PVC filters, eliminating the inconvenience of customers having to weigh filters before use.