Sterilizing Grade Filter Polyethersulfone Cartridges are 100% integrity tested. They are constructed with a double-layer hydrophilic asymmetric polyethersulfone membrane, offering broad chemical compatibility, high flow rates at low pressure drops, and low extractable levels. Polyethersulfone is particularly well-suited for the filtration of products containing substances that tend to adsorb to the filter media. Its low binding characteristics make it an excellent choice for filtering valuable protein solutions, such as vaccines and biological products.