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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.

Inner tubes for tires

Tire curing bladders

Sports ball bladders

Pharmaceutical closures

Inner tubes for tires

Tire curing bladders

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