Ethylene/acrylic elastomer is a copolymer of ethylene and methyl acrylate, plus a small amount of a cure site monomer containing carboxylic acid groups. AEM is a tough, low-compression-set rubber with excellent resistance to high temperatures, hot mineral oil, fluids and weathering. The low temperature flexibility and mechanic properties are better than ACM, but it is not well resistant to low aniline oil (like ASTM No. 3 oil) and polar solvents.
For standard ACM the service temperature is -30°C to 150°C, shortened lifetime up to 175°C.
40 to 85 Shore A are available.
Black and orange colors are available.
AEM is typically chosen for applications requiring improved performance versus nitrile rubber, Neoprene or reduced cost versus higher-end elastomers such as HNBR, FKM. It also usually is applied in automatic industry.