Our stainless steel reinforced pipe flange gaskets are a proprietary molded PTFE gasket featuring a 304 stainless steel perforated reinforcement core. PTFE SS Core gaskets were initially developed for sealing difficult chemical applications requiring superior cold flow and blowout resistance. The combination of corrosion resistance of void-free PTFE fluorocarbon resins with the structural strength of grade 304 perforated stainless steel provides improved operational safety by markedly reducing the need for repeated re-torquing to maintain a leak-free seal.