Full definition
Tetrafluoroethylene-propylene copolymer (TFE/P) — a specialty fluoroelastomer developed by AGC Chemicals (formerly Asahi Glass) that provides excellent resistance to harsh chemicals where standard FKM (Viton) fails: strong bases (NaOH, KOH), amines, steam, hot water, brake fluid, and oilfield drilling fluids (H₂S/CO₂/brine). Temperature range: -5 to +200°C continuous (limited at low temperatures compared to FKM). Properties: hardness 65-90 Shore A, tensile 10-17 MPa, excellent compression set at high temperature. ASTM D2000 classification: varies by formulation. Aflas fills the gap between FKM (which fails with bases and amines) and FFKM (which resists everything but costs 10-50x more). Key applications: oilfield downhole seals (drilling, completion, production), chemical processing (caustic environments), automotive EGR systems, and steam service. Cost: 2-5x standard FKM. Competitor materials: Viton Extreme (DuPont ETP), Dai-el FEPM (Daikin).