Butyl rubber is a synthetic polymer, a copolymer of isobutylene with isoprene. The key advantages butyl rubber offers is superlative air-barrier performance with superior flex properties. Butyl Rubber abbreviated as IIR (Isobutylene-isoprene copolymer) is extensively used to manufacture tire’s Inner Tube. It offers matchless ozone & weather resistance and heat stability.
| Parameter | Butyl Rubber | Test Method |
|---|---|---|
| Mooney Viscosity ML1+8 @ 125 Deg C | 46-56 | |
| Unsaturation Level. Mole % | 1.4-1.8 | Internal Method |
| Calcium stearate content , % Max | 1.2 | Internal Method |
| Volatile Content, % Max | 0.3 | ASTM D 5668 |
| Non-standing Antioxidant content, % | 0.02-0.08 | Internal Method |
| Ash Content, % Max | 0.4 | ASTM D 5667 |