Expanded PTFE gasket and seal materials consists of virgin PTFE with multidirectional fibrous and porous structure, which the extruded PTFE consists of a special manufacturing process provides the material with special chemical and physical properties. Expanded PTFE resists cold flow and creep while offering the widest range of sealability, chemical resistance, and temperature service of any material offered.

PTFE envelope and encapsulated gasket is mainly used in flat flanges and convex section steel pipe flanges connection.