IIR - Butyl rubber (IIR)
| Clwyd reference | IIR |
| ASTM classification | IIR |
| Typical applications |
|
| Advantages | Its impermeable to water and air (acts as barrier). It has good flex properties and good physical strength. |
| Disadvantages |
|
| Available hardness range (Shore A) | 35 - 85 |
| Upper continuous service temp. | 130°C |
| Min. temp. for sealing applications | -50°C |
| Minimum non-brittle temp. | -70°C |
| Tensile strength (up to) | 18 MPa |
| Elongation at break (up to) | >700% |
| Price Bracket | Very low |
| ASTM 1 Oil | None |
| ASTM 2 Oil | None |
| ASTM 3 Oil | None |
| Kerosene | None |
| Liquid B | None |
| Liquid 101 | None |
| Phosphate ester | Good |
| Ketone | None |
| Toluene | None |
| Iso-octane | None |
| Methanol | Excellent |
| Acid (weak) | Good |
| Acid (strong) | None |
| Base (weak) | Excellent |
| Base (strong) | Good |
| Hydrogen sulphide | Excellent |
| Steam | Good |
| Ozone | Good |
| Radiation | Good |