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Polytetrafluoroethylene (PTFE), commonly known as "Plastic King", is a polymer compound formed by polymerization of tetrafluoroethylene. It has excellent chemical stability, corrosion resistance, airtightness, high lubrication, non-stickiness, and electrical insulation. And good anti-aging endurance. Used as engineering plastics, it can be made into PTFE tubes, rods, belts, plates, films, etc. Generally used in corrosion-resistant pipelines, containers, pumps, valves, radar, high-frequency communication equipment, and radio equipment with high performance requirements.
The excellent characteristic of PTFE in terms of mechanical properties is the small friction coefficient, between 0.01 and 0.10, which is the smallest friction coefficient (0.04) in plastics and even in all engineering materials. Its friction coefficient is only polyethylene This is also an important feature of perfluorocarbon surface. The friction factor of PTFE increases with the increase of the sliding speed, and tends to be stable when the linear velocity reaches 0.5-1. 0m/s or more; and the static friction factor is less than the dynamic friction factor. This feature can be used in bearing manufacturing. Reduce its starting resistance and make it very stable from starting to running.
(2) Electrical insulation
Because the fluorine atoms in the molecular chain of PTFE are symmetrical and evenly distributed, there is no inherent dipole moment, and the change is small in the range of 109HZ of power frequency. Its insulation resistance is very high, even if it is immersed in water for a long time, it does not change significantly, and it does not change much with temperature. The breakdown field strength is very high. The breakdown field strength of a very thin PTFE film can reach 200KV/mm As the thickness increases, the breakdown field strength gradually decreases.
(3) Corrosion resistance
In the petroleum, petrochemical and natural gas industry, most of the media are a variety of liquids and gases with different corrosive properties. Therefore, the gaskets used are required to have extremely high chemical corrosion resistance. Polytetrafluoroethylene gaskets are used in concentrated sulfuric acid, nitric acid, hydrochloric acid, and even When boiled in aqua regia, its weight and performance are unchanged, and it is almost insoluble in most solvents, which fully meets the requirements of corrosion resistance.