Perfluororubber is a copolymer of tetrafluoroethylene, perfluoromethyl vinyl ether, and a third monomer. All hydrogen atoms in the monomer are replaced by fluorine atoms, giving perfluororubber unique properties. The Samrez brand perfluororubber (FFKM) O-ring developed by Jiangsu Chongwei Material Technology Co., Ltd. CWC is widely used in the petroleum and petrochemical, semiconductor, food, pharmaceutical, and paper industries for its high cost-effectiveness. Its professional technology and services have received unanimous praise from customers.