Full definition
Hydrogenated Nitrile Butadiene Rubber — a premium grade of NBR in which the polymer backbone is catalytically hydrogenated (saturating the C=C double bonds), dramatically improving heat resistance, ozone resistance, and aging stability while retaining the excellent oil and fuel resistance of standard NBR. Continuous temperature: -30 to +150°C (vs -30 to +100°C for NBR). Ozone resistance: excellent (vs poor for NBR). Tensile strength: 20-30 MPa (among the highest of all elastomers). Abrasion resistance: outstanding. ACN content: 17-50% (same trade-off as NBR — higher ACN = better oil resistance, lower flexibility). Per ASTM D2000 classification: DH. Primary applications: automotive timing belt tooth compound (the dominant application), serpentine belt backing, high-performance shaft seals, hydraulic seals for high-temperature service, and downhole oilfield seals. Cost: 3-5x standard NBR, justified by 2-3x service life and superior performance. Brands: Zeon (Zetpol), Lanxess (Therban).