| http://www.w3.org/ns/prov#value | - thick, most preferably 10 to 40 ??m thick. [0155] Other separator-forming materials which can be used as a substitute for the gel-like polymer include one or more polyolefins such as polyethylene and polypropylene (when more than one is used, a laminate of two or more layers of film is contemplated), polyesters such as polyethylene terephthalate, thermoplastic fluoro-resins such as ethylene-tetra
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