Acrylic elastomers

There are generally two forms of acrylic based elastomer available: Polyacrylates (ACM) and ethylene-acrylates (AEM, Vamac®).

Polyacrylates offer good resistance to lubricating oils and high temperatures, and are commonly used where the two are found in combination.

ACM elastomers show excellent resistance to engine oils (semi- and fully-synthetic), petroleum based lubricants, transmission fluids, aliphatic hydrocarbons, ozone and ultraviolet radiation.

Ethylene acrylic elastomers (AEM) are terpolymers of ethylene, acrylic and a cure-site monomer, supplied by DuPont™ under the tradename of Vamac®.

AEM elastomers exhibit mechanical properties similar to ACM, although they can operate over a wider temperature range than ACM and hydrogenated nitriles (HNBR).