Making use of the nitrogen content nucleophilic characteristic chemical compound of a certain kind, the tetrafluoroethylene, perfluoro (vinyl ether), and the perfluoro elastomer composition which includes perfluoro elastomer it possesses the copolymerization unit of nitrile content hardening region monomer is hardened. In addition, nucleophilic characteristic chemical compound operates in the perfluoro elastomer composition which includes the other cement as a double cement.
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