AEM - Acrylic Ethylene Copolymer

Clwyd reference AEM
ASTM classification AEM

AEM elastomers are primarily used where combined resistance to ozone, heat and oils is required. They are sometimes a good alternative to more expensive heat resistant elastomers such as fluorocarbon polymers (FKM), silicones (VMQ) and fluorosilicones (FVMQ) for elevated temperature applications (< 150 °C). However, AEMs are not recommended for exposure to aromatic hydrocarbons, gasoline, brake fluids and phosphate esters.

Typical applications

Typical applications include automotive transmission / power steering seals and O-rings that have to be resistant to transmission fluids and many other common automotive lubricants and hydraulic fluids. Other applications include diaphragms, plumbing seals, boots, hoses, vibration mounts, pads, isolators and custom molded rubber goods and parts.

The typical continuous operating temperature range is -30°C to 150°C (up to 175°C for limited periods of time).

  • Excellent resistance to petroleum fuel and oil
  • Good heat resistance
  • Good ozone resistance
  • Resists flex cracking
  • Moderate water resistance
Available hardness range (Shore A) 45 - 90
Upper continuous service temp. 175°C
Min. temp. for sealing applications -40°C
Minimum non-brittle  temp.  -60°C
Tensile strength (up to) 20 MPa
Elongation at break (up to) 350%
Price Bracket Low
ASTM 1 Oil Excellent
ASTM 2 Oil Excellent
ASTM 3 Oil Excellent
Kerosene Excellent
Liquid B None
Liquid 101 None
Phosphate ester None
Ketone None
Toluene None
Iso-octane None
Methanol None
Acid (weak) Good
Acid (strong) None
Base (weak) None
Base (strong) None
Hydrogen sulphide None
Steam None
Ozone Excellent
Radiation Good