Ethylene / Acrylic elastomer (AEM, Vamac®)
Ethylene / acrylic elastomer is a copolymer of ethylene and methyl acrylate plus a small
amount of a curesite 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. 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.
Cure system – Amine-Cured
compounds are Amine based vulcanization system.
Other Common Variations
• AEM has good
flexibility and good tear resistance, abrasion and compression set, and it
usually is used in shaft lip seals especially in automatic transmission fluids.
• Special VAMAC compounds can improve oil resistance but will sacrifice some low temperature properties
ASTM D 1418 Designation: AEM
ISO/DIN 1629 Designation: AEM
ASTM D2000 / SAE J 200 Codes: EE
Standard Color(s): Black
Hardness Range: 40 to 85 Shore A
Relative Cost: Medium- High
Standard High Temperature: 150°C / 302°F
Special Compound Low Temperature: -40°C / -40°F
Special Compound High Temperature: 175°C / 347°
Performs Well In...
Doesn't Perform Well In...
Vamac® is a registered trademark of DuPont Performance Polymers.