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Halobutyl is a variety of synthetic rubber or elastomer and refers to halogenated butyl.

The halobutyl rubber is the copolymer of isobutylene (98%) and a small amount of isoprene (2%).

The abbreviation IIR is commonly used to describe butyl or halobutyl rubber as it stands for Isobutylene Isoprene rubber.

The halobuty rubber is odorless and tasteless, though it may exhibit a slight characteristic odor.


The primary attributes of halobutyl rubber are excellent impermeability/air retention and good flex properties, resulting from low levels of unsaturation between long polyisobutylene segments.

Tire innertubes were the first major use of halobutyl rubber, and this continues to be a significant market today.

The quality of these tire innertubes is essential for the air retention and the lifespan of the tires by better resistance to heat, ozone and flex fatigue.

Tire innerliners are by far the largest application for halobutyl rubber today.

The halobutyl rubber provides higher curing rates and enabling co-vulcanization with general purpose rubbers such as natural rubber and styrene-butadiene rubber (SBR).

The halobutyl rubber are available in two forms, the chlorinated (chlorobutyl) and brominated (bromobutyl).

In addition to tire applications, the halobutyl rubbers are also used for vibration dampening, and stability, for pharmaceutical stoppers, construction sealants, hoses, and mechanical goods, because of their:

 – Good impermeability

 – Weathering resistance

 – Ozone resistance

 – High temperature resistance

 – Greater heat stability compared to other synthetic rubber

 – High damping properties

 – Wide latitude in cure and cocure with a variety of rubbers

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1 Comment to “Halobutyl”

  1. Interesting and creative information
    in this article Bromo Butyl
    Thank you for sharing this

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