Because the material such as rubber, glass, metal, alloy in terms of corrosion defects, it is hard to meet strict temperature, pressure and coexistence of chemical substances to the environment, the resulting loss is quite surprised. And "Korean PTFE plastic material with its excellent corrosion resistance, has become the main petroleum, chemical industry, textile and other industries of corrosion resistant material. Its concrete application include: transport corrosive gas duct, the exhaust pipe, steam pipe, steel mill high-pressure tubing, aircraft hydraulic system and cold pressing high school low pressure pipeline system, rectifying tower, heat exchanger, kettle, tower, trough, the lining of the valve and other chemical equipment. Seal performance depends on the efficiency of the whole machine equipment and performance has great influence. PTFE material has corrosion resistance, ageing resistance, low friction coefficient and viscosity, wide scope of heat-resistant, resilient characteristics makes it very suitable for application in manufacturing require high corrosion resistance, temperature higher than 100 ℃ the seals. Such as machine, heat exchangers, pressure vessel, large diameter container of channel flange seal, valve, pump, glass reaction pot, plane flange, large diameter flange seal, shaft, piston rod, valve rod, worm gear pump, rod seal, and so on. 2, low friction properties of polytetrafluoroethylene (PTFE) in friction load applications due to some equipment should not be part of the lubrication, such as in lubricating grease can be solvent dissolution and failure situations or paper, pharmaceutical, food, textile and other industrial products in the field of need to avoid oil contamination, make filling PTFE material mechanical equipment parts without oil lubrication (direct load) under the most ideal material. This is because the friction coefficient of the material is known among the lowest in the solid materials. The specific purpose including chemical equipment, paper making machinery, agricultural machinery bearings, used for piston rings, machine tool guideway, guide ring; In civil engineering is widely used as a bridge, tunnel, steel roof truss structure, bearing block of large chemical pipelines, storage tank, and used as bridge bearings and bridging the swivel.