Teflon(PTFE)has a popular name of"king of plastic",it has perfect chemical stability,resistance to corrosion,leak tightness,high lubrication and no viscidity,electric insulativity,and good anti-aged endurance.It can be a long work in temperature between-180℃ and +260℃,kinds of Teflon(PTFE) products play an important role in national economy of chemical industry,machinery,electric industry,electric appliance,apparatus,aerospace industry,environment protection and bridge work,etc.