Polyacrylate (ACM, PA)

Polyacrylates or simply acrylate rubbers are copolymers having two major components: the backbone ( monomeric acid ester of alkyl or alkoxy) and the reactive curesite. ACMs have good resistance to high heat and oil which is better than NBRs. It also well resists oxygen and ozone even at high temperature, but is with poorer water and low temperature flexibility compared to NBRs. Special ACM can improve low temperature flexibility to -40°C (TR10 value) without reducing oil and heat resistance.

Cure system

Amine based & metal soaps Cured

Standard ACM compounds are Amine based and metal soaps combined to vulcanize.

Other Common Variations

  • Polyacrylates usually are applied in automatic industry, especially in automatic transmission and steering fluids.

General Information

ASTM D 1418 Designation
Standard Color(s)
ISO/DIN 1629 Designation
Hardness Range
45-80 Shore A
ASTM D2000 / SAE J 200 Codes
Relative Cost
Medium – High

Service Temperatures

Standard Low Temperature
-15°C / -5°F
Special Compound Low Temperature
-40C / -40°F
Standard High Temperature
150°C / 302°F
Special Compound High Temperature
175°C / 345°F

Performs Well In...

  • Mineral oils (transmission and steering fluids)
  • Ozone, weather and hot air.

Doesn’t Perform Well In...

  • Alcohol
  • Aromatics and chlorinated hydrocaebons
  • Hot water and steam
  • Acids, alkalis and amines
  • Brake fluids