To get an instant quote for your custom parts, please select your currency and follow steps 1 to 4.
Butyl rubber (IIR) is a synthetic elastomer made by copolymerizing isobutylene with a small amount of isoprene. It is highly impermeable to gases and moisture, while offering good flexibility, chemical resistance, and durability in harsh conditions.
Typical Physical Properties
| Property | Test Method | Butyl Rubber |
|---|---|---|
| Specific Gravity | ASTM D297 | 1.20 ± 0.05 |
| Polymer Content | – | 100% |
| Temperature Range (°C) | – | -40 ~ +125 |
| Colour | – | Black |
Electrical and Mechanical Information
| Property | Test Method | Butyl Rubber |
|---|---|---|
| Hardness Shore A ±5 | ||
| Tensile Strength (Kg/Cm²) | ||
| Elongation at Break (%) MIN | ||
| Tear Resistance ANGULAR (kg/cm) MIN |
||
| Compression Set (70 °C/24 HRS/25% SET) (%) MAX |
||
| Heat Ageing (72 HRS @ 70 °C)<br>– Hardness (PTS)<br>– Tensile Strength (%)<br>– Elongation at Break (%) |
<br>ASTM D573 | <br>– + 3 (MAX)<br>– + 10 / – 10<br>– + 10 / – 10 |
| Chemical Resistance:<br>– Ozone<br>– Dilute Acids and Bases<br>– Concentrated Acids and Bases<br>– Oils<br>– Solvents | <br><br>ASTM D1149 | <br>Excellent<br>Excellent<br>Excellent<br>Fair<br>Not Recommended |
Materials Direct
Precision cut technical materials fast. We’re available to assist you for your next project
A division of Universal Science UK
www.universal-science.com
