Provided is a copolymer which contains tetrafluoroethylene units and perfluoro(propyl vinyl ether) units. The content of perfluoro(propyl vinyl ether) units is 3.8-4.3 mass percent relative to all monomer units. The copolymer has a melt flow rate of 6.0-9.0 g/10 min at 372 degrees centigrade The number of functional groups is 50 or less per 106 main chain carbon atoms.
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