PTFE that is, polytetrafluonethylene, also known as Teflon (Teflon), PTFE fold needle felt is a filter material made of PTFE through three-dimensional acupuncture and its fold is greatly increased the filtration area. At 240℃ continuous operating temperature, instantaneous 260℃ temperature conditions, resistance to all PH range of acid and alkali erosion. Polytetrafluoroethylene synthetic fiber filter bag has excellent self-wetting, no moisture absorption and can withstand ultraviolet radiation. PTFE fiber is a macromolecular linear structure, so it has a strong temperature resistance, wear resistance, corrosion resistance, chemical stability, widely used in steel, power, garbage incineration and other bad flue gas filtration environment.