| http://www.w3.org/ns/prov#value | - oethylene copolymer (hereinafter referred to as ETFE) is most preferred. [0019] ETFE may preferably be one having tetrafluoroethylene and ethylene copolymerized in a ratio of from 70/30 to 30/70 (molar ratio) or one having such monomers copolymerized with at least another copolymerizable monomer other than ethylene, such as a fluoroolefin or propylene.
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