Ptfe needle punched felt are produced from 100 ptfe fiber which has been punched in three dimentional structure. They have excellent features such as excellent flexibility, molding capability, high tensile strength, creep resistance, high and low temperature resistance, corrosion resistance and anti-aging. 100 ptfe filter material can meet requirements in hostile environments of temperature fluctuating and acid & alkali in all ph range. The lifespan of ptfe filter material will be guaranteed for over 4 years as long as the temperature is controlled under the maximum operating temperature.