Acrylic rubber, known by the chemical name alkyl acrylate copolymer (ACM) or the tradename HyTemp, is a type of rubber that has outstanding resistance to hot oil and oxidation.
It has a continuous working temperature of 150 °C (302 °F) and an intermittent limit of 180 °C (356 °F).
It is resistant to ozone and has low permeability to gases.
[1] Its disadvantage is its low resistance to moisture, acids, and bases.
[2] It is also used in shaft seals, adhesives, beltings, gaskets and O-rings.