Make air sampling fast and simple with preassembled, preloaded filter cassettes. Cassettes come preloaded with PCTE membranes that are transparent and nonstaining. They feature a smooth surface and well-controlled pore size and shape, making them ideal for asbestos testing and scanning electron microscopy applications. Select PCTE membranes with porous plastic pad when sampling chemicals that are not compatible with cellulose. Cassettes are preloaded in an ISO 9001:2015-certified facility ensuring high quality control standards.