The difference between PTFE gasket and modified PTFE gasket.

Update:30 Jan 2019
Summary:

Teflon gaskets generally refer to ordinary PTFE gasket […]

Teflon gaskets generally refer to ordinary PTFE gasket with good sealing and corrosion resistance. However, due to the inherent poor creep resistance of the PTFE material itself, the polytetrafluoroethylene gasket may leak the seal due to the creep of the gasket during long-term use. In order to improve this shortcoming of ordinary polytetrafluoroethylene gaskets, some other materials such as graphite, glass fiber, etc. are added to the tetrafluorocarbon to improve the creep of the tetrafluoroethylene and improve the durability of the PTFE gasket.

A gasket that adds other materials to ordinary PTFE is called a modified PTFE gasket. There is also a Multitex expanded PTFE gasket, which is a structural modification. It does not add other materials to PTFE, so it has no effect on its corrosion resistance. It can also greatly improve the ordinary PTFE cold flow property. Used in chemical medicine and strong acid and alkali environment.