Tri-Clamp PTFE Envelope Gasket (PTFE with Viton Core)

The PTFE/Viton Envelope Gasket is a two-part composite gasket that combines the chemical inertness of PTFE (Teflon) with the elasticity of a Viton core. This results in a best-of-both-worlds sealing solution: the outer PTFE layer offers superior chemical resistance, while the inner Viton core provides resilience and compressibility for a tight seal under vacuum or imperfect clamp conditions. Envelope gaskets can handle cryogenic lows (below -100°F) up to about +400°F in continuous operation. They are FDA compliant, meet 3-A sanitary standards, and USP Class VI certified for pharmaceutical use. Unlike rigid solid PTFE gaskets, the Viton core design allows these gaskets to maintain a leak-proof seal without requiring excessive clamp force. Key Features: Dual Construction: PTFE outer shell + Viton inner core. Temperature Range: Cryogenic to +400°F continuous use. Chemical Resistance: PTFE is virtually inert to acids, bases, and solvents. Viton core adds sealing strength. Complianc