A fire safe PTFE spiral wound gasket
The only PTFE gasket that can be used in fire safe services. The InpHerno™ benefits from being an anti-buckling spiral wound with an inner winding that is coated in PTFE, which provides chemical compatibility. This anti-buckling nature gives the gasket the ability to seal in situations where high tightness is required, but only moderate bolt loads are achievable. Meanwhile the flexible graphite from the spiral wound gives the gasket it's fire-tested seal.