Polytetrafluoroethylene is called "plastic king". Roy Planct, the father of fluororesin, began to study freon substitutes in DuPont Company in the United States in 1936. They collected some tetrafluoroethylene and stored it in steel cylinders for the next experiment. However, when the pressure reducing valve of the steel cylinder was opened the next day, no gas overflowed. They thought it was air leakage, but when the steel cylinder was weighed, they found that the steel cylinder did not lose weight. They sawed through the cylinder and found a large amount of white powder, which was Teflon.

The study found that the properties are excellent and can be used for anti-melting sealing gaskets for atomic bombs, artillery shells, etc., so the US military kept the technology secret during World War II. It was not until the end of World War II that it was declassified and industrialized production of PTFE was achieved in 1946.

Chinese trade name "Teflon" (teflon), "Teflon", "Teflon", "Teflon" and so on. It is a polymer compound formed by polymerization of tetrafluoroethylene. Its structural formula is simple. It has excellent chemical stability and corrosion resistance. It is one of the best materials in the world in terms of corrosion resistance. It can withstand all other chemicals except molten alkali metal, chlorine trifluoride, chlorine pentafluoride and liquid fluorine. It cannot change when boiled in aqua regia. It is widely used in various occasions requiring acid and alkali resistance and organic solvents. Sealing, high lubrication non-stick, electrical insulation and good anti-aging ability, excellent temperature resistance (can be in the positive 250 ℃ to negative 180 ℃ temperature for a long time). Teflon itself is not toxic to humans. The use temperature is -190~250 ℃, allowing quenching and quenching, or alternating hot and cold operation. Pressure -0.1~6.4Mpa.

It has solved many problems in chemical, petroleum, pharmaceutical and other fields. PTFE seals, gaskets, gaskets. PTFE seals, gaskets, sealing gaskets are made of suspension polymerization PTFE resin molding. Compared with other plastics, PTFE has the characteristics of chemical resistance, it has been widely used as a sealing material and filling material. The dispersion can be used as an insulating immersion liquid for various materials and as an anti-corrosion coating on the surface of metal, glass and pottery. All kinds of PTFE ring, PTFE gasket, PTFE packing, etc. are widely used in all kinds of anti-corrosion pipeline flange sealing. In addition, it can also be used for drawing silk, polytetrafluoroethylene fiber-fluoron (foreign trade name is Teflon).

Nowadays, all kinds of plastic king products have played a pivotal role in the national economy such as chemical industry, machinery, electronics, electrical appliances, military industry, aerospace, environmental protection and bridges. The use conditions of polytetrafluoroethylene (PTFE) industry chemical, petrochemical, oil refining, chlor-alkali, acid, phosphate fertilizer, pharmaceutical, pesticide, chemical fiber, dyeing, coking, gas, organic synthesis, non-ferrous smelting, iron and steel, atomic energy and polymer filtration materials, high-purity product production (such as ion membrane electrolysis), viscous material transportation and operation, food, beverage and other processing and production departments with highly strict hygiene requirements.