TOP SEALING PTFE FILLER for spiral wound gasket is made by special process of pure PTFE materials. It has good flexibility, compression resilience, creep resistance, high temperature resistance and excellent corrosion resistance, aging resistance, self-lubrication. Sealing performance is outstanding, easy install and use, it is the best ideal sealing material for chemical, pharmaceutical, petrochemical, food and beverage, electronics, electric power, metallurgy, shipbuilding and other industries.