Full definition
The DuPont (now Chemours) trademark for FKM fluoroelastomer — the most widely specified high-performance sealing material for demanding chemical and temperature environments. Viton provides exceptional resistance to mineral oils, fuels, hydraulic fluids, aromatic solvents, concentrated acids, and many other aggressive chemicals. Temperature range: -20 to +200°C continuous (specialty grades to +230°C). Properties: hardness 60-90 Shore A, tensile 10-17 MPa, excellent compression set at high temperature, very low gas permeability. ASTM D2000 classification: HK. Major Viton grades: A (standard, 66% fluorine — general chemical resistance), B (68% fluorine — better fuel resistance), F (highest fluorine — best chemical resistance), GLT/GFLT (improved low-temperature to -40°C), ETP/Extreme (base-resistant, competes with Aflas). Limitations: poor resistance to amines, ketones, esters, and hot water/steam; poor low-temperature flexibility (standard grade); high cost ($20-80/kg). Applications: O-rings and seals for oil/gas, chemical processing, automotive fuel systems, aerospace, and semiconductor. Competitors: Dai-el (Daikin), Tecnoflon (Solvay), Dyneon (3M).