聚四氟乙烯俗稱“塑料王”，使用溫度-180°C+250°C,具有優(yōu)異的耐腐蝕性能，即使在高溫下也能耐濃酸，濃 堿和強氧化劑，因而在腐蝕性工況介質中用得廣泛。但聚四氟乙烯導熱性差，如用它做成摩擦付材料，摩擦熱很難 導出，致使溫度升高，密封性能惡化，所以在純聚四氟乙烯中加入各種填充料來進行改性。

The polytetrafluoroethylene(PTFE), commonly called asi a plastics kingi, are used in temperature - 180 +250. It are widely used in medium of corrosion condition, as it has the excellent corrosion-resistant and resisting strong acid, strong alkali and oxidant in high temperature. If PTFE is made as the friction material, The heat is so difficult to conduct that the temperature get higher and the sealing performance become worse. So, the performance of PTFE are changed by infilling various of packing.