Full definition
Ethylene-propylene-diene monomer terpolymer — one of the most versatile and widely used synthetic rubbers, offering exceptional resistance to ozone, UV radiation, weathering, hot water, steam (up to 150°C), and polar chemicals (dilute acids, alkalis, ketones, alcohols). The fully saturated ethylene-propylene backbone provides inherent oxidation stability without the need for special antiozonant protection. Temperature range: -50 to +150°C continuous. Properties: hardness 30-90 Shore A, tensile 7-21 MPa, elongation 200-600%, excellent electrical insulation, outstanding compression set resistance. ASTM D2000 classification: AA (standard), BA/CA/DA (higher grades). Cured with sulfur (requires the diene termonomer: ENB, DCPD, or HD) or peroxide (better heat and compression set). Limitations: poor resistance to mineral oils, greases, and hydrocarbon solvents (incompatible — swells and degrades). Applications: automotive door and window seals, roofing membranes (single-ply), radiator and heater hoses, steam hoses, washing machine gaskets, electrical cable insulation, industrial rubber sheet, and expansion joints. Global production: ~1.5 million tonnes/year. Manufacturers: Lanxess (Keltan), Dow (Nordel), Lion Copolymer, SK, Mitsui.