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Product Information

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 along with heat stability.

Inner tubes for tires

Tire curing bladders

Inner tube valve

Pharmaceutical closures

Sports ball bladders

Parameter IIR-1 IIR-2 IIR-3 Test Method
Mooney viscosity ML 1+8 (125°С) 35-47 46-56 35-65 ASTM D 1646-06
Unsaturation, % mol. 1.4-1.8 1.4-1.8 0.7-2.3 Manufacturer Testing Method
Drying loss, %, max. 0.5 0.5 0.5 ASTM D 5668
Mass fraction of an antioxidant Irganox 1010 %: 0.02– 0.08 0.02– 0.08 - Manufacturer Testing Method
Mass fraction of ash, %, max. 0.35 0.4 - ASTM D 5667
Mass fraction of calcium stearate, %, max. 1.2 1.2 - Manufacturer Testing Method

* Grade names are temporary