| http://www.w3.org/ns/prov#value | - Alternatively, a copolymer may be used such as one made of two or more materials selected from the group consisting of tetrafluoro-ethylene, hexafluoro-ethylene,hexafluoro-propylene, perfluoro-alkyl vinyl ether, vinylidene fluoride, chloro-trifluoro ethylene, ethylene, propylene,
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