CSM - Chlorosulfonated Polythene Rubber
| Clwyd reference | CSM |
| ASTM classification | CSM |
| Typical applications |
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| Advantages |
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| Disadvantages | Poor fuel resistance |
| Available hardness range (Shore A) | 40 - 80 |
| Upper continuous service temp. | 125°C |
| Min. temp. for sealing applications | -25°C |
| Minimum non-brittle temp. | -40°C |
| Tensile strength (up to) | 23 MPa |
| Elongation at break (up to) | 350% |
| Price Bracket | Very low |
| ASTM 1 Oil | Excellent |
| ASTM 2 Oil | Good |
| ASTM 3 Oil | Good |
| Kerosene | Good |
| Liquid B | None |
| Liquid 101 | None |
| Phosphate ester | None |
| Ketone | None |
| Toluene | None |
| Iso-octane | None |
| Methanol | Excellent |
| Acid (weak) | Good |
| Acid (strong) | None |
| Base (weak) | Good |
| Base (strong) | None |
| Hydrogen sulphide | None |
| Steam | Average |
| Ozone | Excellent |
| Radiation | Good |