RFSEAL (Fire Safe) insulating gasket includes a PTFE spring-energized primary sealing element and a Mica secondary sealing element. It adds fire service capability to the standard MCG design through the use of a secondary sealing element of high temperature resistant Mica, which can maintain a sealing performance while subject to a fire of 1500°F (815°C). Under this design, the PTFE spring-energized primary sealing element and Mica secondary sealing element are both seated in the retainer of insulating laminate bonded to a stainless steel core, creating a fireproof insulating gasket.
Both seals of RFSEAL gasket have very good spring back, they require low bolt stress for the sealing. Second seal will be a backup seal under the normal environment, and it will work once the first seal failure during the fire.
