| http://www.w3.org/ns/prov#value | - As indicated above, the membrane is a multilayered structure including layers formed of materials such as polyethylene, polyvinyl chloride, tetrafluoroethylene, polypropylene, cellophane, polyacrylamide, cellulose acetate, polymethyl methacrylate, silicone polymers, polycarbonate, cuprophane, collagen and block copolymers thereof.
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