IIR O-rings 90 Shore A

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Butyl rubber, sometimes referred to simply as butyl, is a synthetic rubber, a copolymer of isobutylene and isoprene. The abbreviation IIR stands for isobutylene isoprene rubber.

Polyisobutene, also known as PIB or polyisobutene, is the homopolymer of isobutylene, or 2-methyl-1-propene, on which butyl rubber is based.

Butyl rubber is produced by polymerization of approximately 98% isobutylene with approximately 2% isoprene. Polyisobutylene is structurally similar to polypropylene, but it has two methyl groups that are substituted on each other carbon atom instead of one. Polyisobutylene is a colorless to slightly yellow visco-elastic material. It is generally odorless and tasteless, although it may have a slight characteristic odor.

After isobutylene and polyisobutylene were already discovered, it was later developed into butyl rubber in 1937 by researchers William J Sparks and Robert M Thomas in the Standard Oil of New Jersey laboratory in Linden, NJ. Today, most of the worldwide supply of butyl rubber is produced by two companies. Exxonmobil and Polymer Corporation.

In the 1950s and 1960s, halogenated butyl rubber (halobutyl) was developed, in the chlorinated (chlorobutyl) and brominated (bromobutyl) variants, with considerably higher curing speeds and covulcanization with other rubbers such as natural rubber and styrene-butadiene rubber. Halobutyl is today the most important material for the inner linings of tubeless tires.

Benefits IIR:
• Excellent low gas permeability
• Good flexibility
• Good electrical properties
• Good chemical resistance
• Good moisture resistance
• Good wear resistance
• It can function for a longer time at -50 degrees to +120 degrees
• It has good ozone and aging resistance
• Excellent air impermeability
• Good flex properties
• Is known for its high degree of gas tightness
• Good weather resistance
• Resistant to acids and alkalis oxidation sunlight

Downsides of IIR:
 - Cannot be used with mineral oils

On this page we offer our range of 90 Shore A O-Rings. Search for your specific O ring by using the filters on the left of the page or take your time and browse our wide range of our products. When you can not find the product you are looking for in our 90 Shore A made from IIR, please send us a Direct Enquiry. Together we can discuss the specifications and find the right product for you.

16 products
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ProductDimensionsMaterialHardness (Shore A)CertificationStock
O-Ring 174 X 3 IIR95 Black O-ring Black174 x 3IIR Butyl95 Shore ANee57 icon
O-Ring 105 X 4 IIR90 Black O-ring Black105 x 4IIR Butyl90 Shore ANee52 icon
O-Ring 215 X 4 IIR90 Black O-ring Black215 x 4IIR Butyl90 Shore ANee55 icon
O-Ring 365 X 6 IIR90 Black O-ring Black365 x 6IIR Butyl90 Shore ANee59 icon
O-Ring 75.57 X 5.33 IIR90 Black O-ring Black75.57 x 5.33IIR Butyl90 Shore ANee50 icon
O-Ring 78 X 3 IIR90 Black O-ring Black78 x 3IIR Butyl90 Shore ANee52 icon
O-Ring 34 X 3 IIR95 Black O-ring Black34 x 3IIR Butyl95 Shore ANee57 icon
O-Ring 715 X 8.4 IIR90 Black O-ring Black715 x 8.4IIR Butyl90 Shore ANee56 icon
O-Ring 240 X 4 IIR95 Black O-ring Black240 x 4IIR Butyl95 Shore ANee58 icon
O-Ring 530 X 6 IIR95 Black O-ring Black530 x 6IIR Butyl95 Shore ANee53 icon
O-Ring 185 X 4 IIR90 Black O-ring Black185 x 4IIR Butyl90 Shore ANee55 icon
O-Ring 65 X 5.5 IIR90 Black O-ring Black65 x 5.5IIR Butyl90 Shore ANee54 icon
O-Ring 24.2 X 3 IIR90 Black O-ring Black24.2 x 3IIR Butyl90 Shore ANee57 icon
O-Ring 86 X 3.5 IIR95 Black O-ring Black86 x 3.5IIR Butyl95 Shore ANee54 icon
O-Ring 32.92 X 3.53 IIR95 Black O-ring Black32.92 x 3.53IIR Butyl95 Shore ANee54 icon
O-Ring 20.29 X 2.62 IIR90 Black O-ring Black20.29 x 2.62IIR Butyl90 Shore ANee50 icon