PTFE (polytetrafluoroethylene) fiber is currently one of the fibers found worldwide with excellent chemical resistance. It is extracted from "fluorine" stone, and its fiber melting point is 327 ℃. Its temperature resistance can reach 270 ℃. PTFE fiber has good low friction, difficult to burn, and good insulation and insulation properties. It can withstand the oxidation and corrosion of various oxides and will not undergo hydrolysis reactions at all. It has good filtration efficiency and good ash cleaning performance. Even at high concentrations, only a small amount of dust adheres to the surface. Under the same working conditions, the service life of high-temperature filter bag filter materials will be increased by more than 1-3 times compared to other materials of filter materials. Has a high cost-effectiveness.