Provided is a copolymer that contains tetrafluoroethylene units and perfluoro(propyl vinyl ether) units, the perfluoro(propyl vinyl ether) unit content being 3.9–4.9 mass percent relative to the total monomer units, the melt flow rate of the copolymer at 372 degrees centigrade being 4.0–9.0 g/10 min, and the copolymer having no more than 40 functional groups per 106 main chain carbons.

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