PTFE envelope gaskets are popular for sealing between flange faces in pipelines, distillation columns,

PTFE envelope gaskets are  popular  for sealing between flange faces in pipelines, distillation columns, reactor vessels, etc.A PTFE envelope gasket consist of compressible material, combining the chemical resistance of PTFE with the resilience of the selected insert. This combination provides a gasket that is capable of compensating for irregularities, which are often found in flanges, particularly those with a very large diameter.

PTFE Gasket