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What Is IIR Rubber?

Butyl and Halobutyl Rubber


  • Copolymer of isobutylene with isoprene
  • Chlorinated and brominated butyl have greater crosslinking flexibility and compatibility with other elastomers like NR and SBR
  • As with other elastomers the different grades available differ by molecular weight (Mooney Viscosity)
  • The chemical inertness of butyl allows high temperature mixing to alter the properties of the Heat treatment gives more flexible vulcasnizates

what is IIR Rubber Typically used For

  • Tire Curing bladder                         
  • Tire innerliner                  
  • Tire sidewall
  • Sporting balls bladder                   
  • Gas masks and chemical agent protection
  • Pharmaceutical stoppers             
  • Chewing gum                    
  • Bridge bearing pads
  • Conveyor belt                                   
  • Engine mounts                
  • Hoses
  • Sealant tapes                                   
  • Seals                                     
  • Tank linin

What are the KEY Properties of IIR

  • Excellent impermeability to gas
  • Good flex properties – high damping behavior
  • Great ozone resistance and weathering resistance
  • Moisture resistance
  • Chemical resistance
  • Halogenated Butyl shows superior impermeability to air, gases, vibration damping and aging resistance

Rubber Application Matrix

HEXPOL’s rubber compounds can be used in a variety of different applications. Download our Application Matrix to see which compounds can fit your application.

Rubber Application Matrix

Contact our global experts

To learn more about how we can make a material difference in your business, contact our skilled staff representatives for more detailed information.