1.PTFE Envelope, flexible materials insert. 2. High pressure 3.High temperature Specifications PTFE Envelope Gasket 1.PTFE Envelope, flexible materials insert. 2. High pressure 3.High temperature PTFE Envelope Gasket with core material of flexible materials (Asbestos, non-asbestos; rubber, etc.), which is wrapped by PTFE. Typical ApplicationsIt is mainly used as a gasket for tower, groove and all ...