This Whatman Polydisc AS (Aqueous Solution) 50mm filter device is sterile and has a 0.2µm pore size. It features a high throughput polyethersulfone membrane, which has low protein binding and no surfactants. It was developed for use in the pharmaceutical industry. A glass microfiber prefilter extends the life of the membrane and effectively filters heavily contaminated samples. Each Polydisc AS device has a sterility cap on the outlet and is sealed in its own medical grade clear blister pack, irradiation sterilized, and secured in a protective shelf pack. It has no EtO residuals. The barbed hose connections fit multiple tubing sizes. It is lightweight (11.5 grams) and avoids the collapsing of tubing which can be caused by heavy filter devices. Size: 50mm. Pore Size: 0.2µm. 10/Pack. Whatman #: 6724-5002.