Chlorobutyl Rubbers

Properties and Applications

Chlorobutyl (CIIR) is a copolymer of chlorinated isobutylene and small amounts of isoprene which provides unsaturated sites for vulcanization. This elastomer has many of the attributes of butyl rubber, including low gas and moisture permeability, good vibration damping, low glass transition temperature, excellent resistance to ageing and weathering. Compared to butyl rubber, the chlorinated sites are more reactive, providing faster cure with lower amount of curatives and better adhesion to unsaturated rubbers and metals.

Because of its excellent weather and ozone resistance, and improved chemical resistance, chlorobutyl is an excellent choice for rubber articles needing good resistance to chemicals, weathering and ozone such as tank linings, special purpose conveyor belts and protective clothing. It is also a good choice for tire innerliners, seals and membranes. Furthermore, chlorinated butyl is often the material of choice for pharmaceutical closures due to its cleanliness and good resealing properties.

Manufacturers & Distributors

• Exxon Mobile
• Arlanxeo

Brand Names

• Exxon Chlorobutyl Rubber
• Chlorinated X_Butyl

¹ARLANXEO is a complete joint venture of LANXESS and Saudi Aramco