ASTM D-2000 classification: CF, DF, DH, EH
Temperature Range:
Low Temp: -20°C (-5°F) Brittle -25°C (-13°F)
High Temp: 150°C (300°F) Intermittent 180°C (356°F)
Properties
Polyacrylate rubber (or ACM) is a specialty rubber with the primary advantage being its ability to withstand high heat while retaining oil resistance. It is often used for applications involving sulphur bearing lubricants, which are experiencing increased usage in automotive applications, particularly transmission seals.
From the standpoint of performance, ACM occupies an intermediate position between fluorocarbon and nitrile. Additionally, polyacrylates are not highly corrosive to steel, exhibit good damping characteristics and can be compounded to provide excellent flex life and some degree of flame resistance. However, this acrylic based elastomer has a few limitations. The poor low temperature flexibility lessens its usefulness, and its compression set is not as good as that of most other compounds. It is also not as good as many other elastomers in strength and water resistance.
Applications
ACM is mainly used for O-rings and shaft seals to seal heavy oils at high temperatures and in the automotive industry for transmission and power steering applications.
| EMI Reference | Specification | Hardness IRHD | SG | Tensile Strength (MPa) | Elongation at Break % | Colour |
|---|---|---|---|---|---|---|
| 311 - 40 | Good Commercial | 40° | 1.1 | 17 | 400 | Black |
| 311 - 50 | Good Commercial | 50° | 1.1 | 17 | 375 | Black |
| 311 - 60 | Good Commercial | 60° | 1.1 | 18 | 350 | Black |
| 311 - 70 | Good Commercial | 70° | 1.1 | 18 | 350 | Black |
| 311 - 80 | Good Commercial | 80° | 1.1 | 19 | 325 | Black |
| 311 - 90 | Good Commercial | 90° | 1.1 | 20 | 300 | Black |
