| http://www.w3.org/ns/prov#value | - Very useful membranes can be made of materials selected from polyamides, for example nylons and the like, cellulosic components, for example, cellulose acetate and other cellulosic polymers, glasses, fiber glasses, polyesters, polyurethanes, polyvinyl chloride, polyethylene vinyl acetate, polypropylene vinyl acetate, natural and synthetic rubbers, and the like, combinations thereof and mixtures th
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