PTFE E nvelope gasket consists of asbestos,non-asbestos,rubber etc.cushion material having exposed surface covered with PTFE envelope.Depends on excellent corrosion resistance and compession resilient. it"s widely used in strong alkalis,cryogenic fluids,oxygen,chlorine gas and disallowable polluted medium etc. 6600V--V Type PTFE slit in center from out side

6600L--Square Type PTFE sheet machine cut to envelope form

6600U--U Type PTFE tape heat sealed at one joint