... ,no defects of air bulbs, crevices layers separation and machinery damages.Used for Machinable production liner, complex ... piece, three-, four-way, elbow and other pipe fittings, wide turning plate, chemical container ... known plastics, PTFE has the best chemical corrosion resistance and dielectric properties, non-aging, non-stick, in ... match the customer's special design. PTFE O-ring gasket