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Butyl rubber is a synthetic rubber produced by polymerization of about 98% of isobutylene with about 2% of isoprene, which can be made from only via cationic addition polymerization. It is generally odorless and tasteless. Butyl rubber has excellent impermeability, and the long polyisobutylene segments of its polymer chains give it good flex properties.   A synthetic rubber, or elastomer, butyl rubber is impermeable to air and used in many applications requiring an airtight rubber. It is used in the manufacture of tyres, adhesives, ball bladders, caulks and sealants, O-rings, for rubber and polymer modification, for protecting and sealing certain equipment for use in areas where chemical weapons are present, and even in chewing gum. The first major application of butyl rubber was tire inner tubes. This remains an important segment of its market even today.

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