Full definition
Acrylonitrile-butadiene copolymer — the standard elastomer for applications requiring resistance to mineral oils, fuels, greases, and hydraulic fluids, making it the most widely used sealing material in the world. The key variable is ACN (acrylonitrile) content (18-50%): higher ACN = better oil resistance but reduced low-temperature flexibility and resilience. Common grades: low ACN (18-24%, Tg = -40°C, flex-fuel hoses), medium ACN (28-36%, Tg = -25°C, general industrial — most common), high ACN (38-50%, Tg = -10°C, best oil resistance, refinery seals). ASTM D2000 classification: BF (low ACN), BG (medium), BK (high). Properties: hardness 40-90 Shore A, tensile 10-25 MPa, elongation 200-600%, good abrasion resistance. Temperature range: -40 to +100°C (standard), +120°C (short-term). Limitations: poor ozone and UV resistance (requires antiozonant protection or blending with PVC), not suitable for polar solvents (ketones, esters). Applications: O-rings, oil seals, fuel hoses, hydraulic seals, gaskets, gloves, and printing rollers. Most produced specialty rubber globally.