The present invention provides a copolymer containing a tetrafluoroethylene unit and a perfluoro(propyl vinyl ether) unit, wherein the perfluoro(propyl vinyl ether) unit content is 5.6 to 6.3 mass percent relative to the total monomer units, the melt flow rate at 372 degrees centigrade is 17.1 to 23.0 g/10 min, and the number of functional groups is 50 or less per 106 main-chain carbon atoms.
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