ACM elastomers are composed of polar acrylic acids, which provide good resistance to high-additive lubricating oils due to their polar nature. The saturated¹ main chain of ACM grants the material excellent resistance to ozone, weather, and heated air. Additionally, petroleum-based oils and fluids used in engines, transmissions, and automatic transmissions do not damage ACM.
However, ACM has moderate strength and low elasticity, and its performance in cold conditions is limited. The material is unstable in hot water, steam, fuels, polar solvents (e.g., acetone, MEK), aromatic hydrocarbons (benzene, xylene, toluene), chlorinated hydrocarbons, glycol-based brake fluids, acids, lyes, amines, and certain hydraulic fluids (HFA, HFD, HFC, HFD).
ACM is a cost-effective alternative to HNBR and FKM when used in high volumes, with a good high-temperature tolerance up to 160 °C. It is primarily used in automotive transmissions, including components such as Simmerrings, O-rings, housing covers, and oil pan seals.
¹ A polymer with no reactive double bonds is described as saturated.
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