Poly Tetra Flouro Ethylene Seal / Gasket is corrosion resistant, non - contaminating gasket that can be used up to a temperature range of +250 ° C. Aflon Engineering Corporation supplies Poly Tetra Flouro Ethylene Seal / Gasket. Aflon Engineering Corporation manufactures a wide range of PTFE, TEFLON, HIFLON products for various industrial applications. The Seal / Gasket is available in various specifications and comes with rubber or asbestos rings sandwiched between PTFE flaps.