Full definition
Acrylic rubber — a polyacrylate elastomer providing good resistance to hot engine oils, automatic transmission fluid (ATF), and lubricating greases at continuous temperatures up to 150-175°C. ASTM D2000/SAE J200 classification: DF (standard), DH (higher heat). Superior to nitrile (NBR) in heat and oxidation resistance; more economical than fluoroelastomers (FKM). Properties: hardness 40-90 Shore A, tensile 7-14 MPa, elongation 100-350%, compression set moderate. Temperature range: -15 to +175°C (poor low-temperature flexibility is its main limitation). Chemical resistance: excellent to mineral oils, hydraulic fluids, and ozone; poor to water, glycol coolants, and steam. Primary applications: automotive shaft seals, transmission seals, O-rings, gaskets, and valve cover gaskets exposed to hot engine oils. Often used in direct contact with transmission fluids where NBR cannot survive the temperature. Brands/suppliers: Zeon (HyTemp), Unimatec.