PTFE is generally used in the presence of aggressive chemicals. It can be supplied as a bore liner to shield pipe gaskets from chemical attack: these are supplied to fit specific bore sizes, and are known as PTFE envelopes. PTFE has the same co-efficient friction as ice on ice, so it is an exceptionally non-stick material. Other products you may also interested: 1. ptfe skived sheet 2.ptfe gasket 3.ptfe thread seal tape 4.pure ptfe sheet 5.ptfe plates