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Polytetrafluoroethylene [PTFE] is one of the best corrosion resistance materials in the world today, so it has the reputation of "plastic king". It can be used in any kind of chemical medium for a long time, and its production has solved many problems in China's chemical industry, petroleum, pharmaceutical and other fields. Ptfe seals, gaskets, gaskets. Polytetrafluoroethylene seals, gaskets, sealing gaskets are made of suspended polymer polytetrafluoroethylene resin molding. Compared with other plastics, polytetrafluoroethylene has excellent chemical corrosion resistance and temperature resistance, and it has been widely used as sealing materials and filling materials. It has a high degree of chemical stability and excellent chemical corrosion resistance, such as resistance to strong acid, strong alkali, strong oxidant, outstanding heat resistance, cold resistance and wear resistance, long-term use temperature range of -200-+250℃, and excellent electrical insulation, and is not affected by temperature and frequency. In addition, it has the characteristics of non-adhesion, non-absorption, non-burning, etc. The suspended resin is generally molded and sintered, and the rod, plate or other profiles produced can be further processed by machining methods such as car planing, drilling and milling. The bar can be made into oriented film by turning and drawing.