PTFE envelope gasket

Envelope gasket is designed to deliver superior sealing performance by enclosing a resilient filler material within a protective PTFE envelope. This construction allows the gasket to withstand highly corrosive fluids while maintaining the flexibility and strength required for stable flange sealing. The PTFE outer layer remains chemically inert, offering full resistance to acids, alkalis, solvents, and aggressive process chemicals, while safeguarding the internal gasket material from direct exposure. This combination makes the PTFE envelope gasket a reliable option for systems where standard gaskets fail due to chemical attack or contamination concerns.

The gasket envelope ensures a smooth, non-stick sealing surface that adapts easily to flange irregularities, achieving tight compression even at moderate bolt loads. Because the PTFE surface does not absorb moisture or degrade with age, the gasket delivers consistent performance over long service periods, especially in applications where product purity and cleanliness are critical. Inside the envelope, fillers such as rubber, compressed fiber, or soft PTFE provide structural support, helping the gasket maintain thickness, compressibility, and resistance to creep. This layered design blends chemical inertness with mechanical stability, extending service life in systems exposed to fluctuating temperatures and pressures.

A gasket envelope is particularly valuable in industries requiring sanitary or contamination-free operation. The PTFE covering prevents process fluids from reaching the filler, ensuring no fiber shedding, leaching, or cross-contamination occurs. This makes PTFE envelope gaskets suitable for food and beverage pipelines, pharmaceutical processing lines, biotechnology vessels, and equipment handling highly pure or sensitive chemicals. They also perform well in chemical production, wastewater systems, and oil and gas environments where corrosion resistance is essential.

By combining the durability of a filler material with the protective barrier of a PTFE envelope, these gaskets provide dependable sealing on glass-lined flanges, ceramic flanges, stainless steel connections, and other surfaces prone to chemical attack. Their resistance to sticking and cold flow further supports safe removal and reinstallation during maintenance. As a versatile and clean sealing solution, the PTFE envelope gasket offers long-term reliability for any process that depends on chemical stability, leak prevention, and material purity.