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Rack of tires made with Chlorobutyl

Chlorobutyl rubber  

Exxon™ chlorobutyl rubber is an isobutylene-isoprene copolymer derived from reacting butyl rubber with chlorine in a continuous process. It is structurally similar to Exxon™ bromobutyl rubber and produced through the same halogenation process.

Our chlorobutyl gradeslate offers a range of polymer viscosities and cure responses through adjustments in functionality and additives content. Compared with regular butyl rubber, Exxon chlorobutyl rubber provides an improved compression set and better resistance to heat, ozone and flex fatigue.

Benefits

  • Low permeability to air, gases and moisture
  • Vibration damping
  • Low glass transition temperature, similar to regular butyl
  • Wide vulcanization versatility
  • Fast cure rates
  • Processing safety: no nitrosamines or nitrosamines precursors
  • Good adhesion and compatibility to other rubbers

Products

  • ExxonMobil Chemical Page

    Exxon™ chlorobutyl rubber

    Discover technical details and specifications for chlorobutyl rubber product grades.

    View data sheets
  • multiple blue ev cars

    How can air increase an Electric Vehicle’s range?

    Electric vehicles with underinflated tires lose battery range, so retaining air is key. Learn about an existing easy solution.

    Learn more
  • exxpro blue car arch

    Boost your tires for the new mobility

    Lower permeability than regular halobutyl polymers, making it perfect for tire innerliner applications to achieve better tire and vehicle performance.

    Learn more
  • Butyl Inner Tube Liner graphic

    Air retention matters!

    Learn more about ExxonMobil Chemical’s butyl rubber products and how tires with halobutyl innerliners maintain proper tire pressure, and better air retention brings better performance.

    Learn more

Industries and applications

Featured resources

View highlighted news, events, technical papers and case studies below. To see our full collection of resources, browse our Library.
  • ExxonMobil Chemical Library icon

    Gradeslate: 80 years of leadership in butyl technology

    Reference the list of ExxonMobil Chemical’s butyl rubber gradeslate, including grades and typical applications.

    Read more
  • ExxonMobil Chemical play button icon

    Video: Proper air retention can make all the difference

    It’s the everyday moments that can easily go from simple to complex, good to bad, or economical to expensive – simply due to tire inflation. ExxonMobil halobutyl tire innerliners help to keep the air in your tires.

    Watch the video
  • ExxonMobil Chemical play button icon

    Video: Air retention

    We keep the air in your tires and the good times rolling.

    Watch the video
  • ExxonMobil Chemical Library icon

    Airing a problem with tire safety and performance

    Jeffrey Valentage, Global Tire Market Development Manager at ExxonMobil Chemical, explores an often neglected element that ensures the long-term safety and performance of tires. This article is available in English only.

    Read more
  • ExxonMobil Chemical Library icon

    Sustained commitment: Supply, innovation, technology and quality

    An interview with Kurt Aerts, Vice President, Global Specialty Elastomers and Butyl, ExxonMobil.

    Read more
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