Polytetrafluoroethylene, commonly known as "Plastic King". It is a polymer compound formed by polymerization of tetrafluoroethylene. It has excellent chemical stability, corrosion resistance, airtightness, high lubrication, non-stickiness, electrical insulation and good aging resistance. It can work for a long time at a temperature of +250℃ to -180℃. Except for molten sodium and liquid fluorine, it can withstand all other chemicals. It will not change when boiled in aqua regia. 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.