ACM – Polyacrylate Rubber
| Clwyd reference | ACM |
| ASTM classification | ACM |
| Copolymer of ethyl and butyl acrylate | |
| Typical applications | Automotive sealing applications, including seals for transmission and power steering systems |
| Advantages | Excellent resistance to petroleum fuel and oil Good heat resistance Good ozone resistance Resists flex cracking |
| Disadvantages | Moderate water resistance |
| Available hardness range (Shore A) | 45 – 90 |
| Upper continuous service temp. (°C) | 175 |
| Min. temp. for sealing applications (°C) | -60 |
| Minimum non-brittle temp. (°C) | -60 |
| Tensile strength (up to) | 20 MPa |
| Elongation at break (up to) | 400% |