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Home  »  Types of Synthetic Rubber  »  Butyl Rubber (IIR)

Butyl Rubber (IIR)

Butyl Rubber (IIR) Butyl rubber (IIR), the chemical name of which is Isobutylene-isoprene copolymer is actually the copolymer of isobutylene and a small amount of isoprene. Also known as polyisobutylene, this rubber was first commercialized in 1943. Resulting from low levels of unsaturation between long polyisobutylene segments, the primary quialities of butyl rubber are excellent impermeability or air retention and good flexible properties. The first major use of butyl rubber was Tire innertubes, and this continues to be a significant market today.

Applications of Butyl Rubber

Check out our article Butyl Rubber Applications.

Processing and Vulcanization of Butyl Rubber

For most applications, butyl rubber must be compounded and vulcanized to yield useful, durable end use products. This is same for all other rubbers as well. Grades of Butyl are developed to meet specific processing and property needs, and hence a range of molecular weights, unsaturation, and cure rates are available commercially. Both the end use properties and the processing equipment are important in determining the right grade of Butyl to be used in a specific application. The selection and ratios of the proper fillers, stabilizers, processing aids and curatives play vital roles in both how the compound will process and how the end product will behave.
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Properties of Butyl Rubber

Other Types of Synthetic Rubber








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