PTFE Gaskets (Teflon Flat & Envelope)

PTFE gaskets — sometimes called Teflon gaskets after the well-known Chemours trade name — are not rubber, but they are a critical part of the flat gasket family for aggressive chemical and high-temperature service. Virgin PTFE offers near-universal chemical resistance across pH 0–14, operates from −200°C to +260°C, and is naturally non-stick and low-friction. The material does not elastically recover, so PTFE gaskets require higher compression — typically 20–25% of thickness — and well-machined flanges to seal reliably. Virgin PTFE is soft and cold-flows under bolt load, which can cause loss of preload over time. For improved creep resistance, filled PTFE grades use glass, carbon, graphite or bronze fillers. PTFE envelope gaskets combine a thin PTFE shell with a soft elastomer or compressed-fiber insert: the PTFE faces provide chemical resistance while the insert provides conformability and recovery. PTFE gaskets are widely used in chemical processing, pharmaceutical reactors, semiconductor equipment, food processing and cryogenic systems. They are static-only and should not be used where significant flange movement or vibration is expected. We supply virgin PTFE, filled PTFE and PTFE envelope gaskets cut to drawing or standard flange dimensions. Specify filler type, thickness, flange class and media when requesting a quote.