IIR O-rings 75 Shore A

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Hardness (Shore A) expand_more

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 75 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 75 Shore A made from IIR, please send us a Direct Enquiry. Together we can discuss the specifications and find the right product for you.

26 products
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ProductDimensionsMaterialHardness (Shore A)CertificationStock
O-Ring 414 X 5 IIR75 Black O-ring Black414 x 5IIR Butyl75 Shore ANee53 icon
O-Ring 200 X 5.7 IIR75 Black O-ring Black200 x 5.7IIR Butyl75 Shore ANee52 icon
O-Ring 160 X 6 IIR75 Black O-ring Black160 x 6IIR Butyl75 Shore ANee55 icon
O-Ring 46 X 3 IIR75 Black O-ring Black46 x 3IIR Butyl75 Shore ANee50 icon
O-Ring 94.8 X 3.53 IIR75 Black O-ring Black94.8 x 3.53IIR Butyl75 Shore ANee51 icon
O-Ring 37.82 X 1.78 IIR75 Black O-ring Black37.82 x 1.78IIR Butyl75 Shore ANee60 icon
O-Ring 145 X 6 IIR75 Black O-ring Black145 x 6IIR Butyl75 Shore ANee56 icon
O-Ring 190 X 4 IIR75 Black O-ring Black190 x 4IIR Butyl75 Shore ANee58 icon
O-Ring 14 X 2.7 IIR75 Black O-ring Black14 x 2.7IIR Butyl75 Shore ANee57 icon
O-Ring 129.5 X 3 IIR75 Black O-ring Black129.5 x 3IIR Butyl75 Shore ANee53 icon
O-Ring 44 X 3 IIR75 Black O-ring Black44 x 3IIR Butyl75 Shore ANee60 icon
O-Ring 450 X 8 IIR75 Black O-ring Black450 x 8IIR Butyl75 Shore ANee53 icon
O-Ring 265 X 4 IIR75 Black O-ring Black265 x 4IIR Butyl75 Shore ANee51 icon
O-Ring 36 X 5 IIR75 Black O-ring Black36 x 5IIR Butyl75 Shore ANee54 icon
O-Ring 40 X 6 IIR75 Black O-ring Black40 x 6IIR Butyl75 Shore ANee51 icon
O-Ring 55 X 3.5 IIR75 Black O-ring Black55 x 3.5IIR Butyl75 Shore ANee58 icon
O-Ring 30 X 2 IIR75 Black O-ring Black30 x 2IIR Butyl75 Shore ANee52 icon
O-Ring 45 X 4.5 IIR75 Black O-ring Black45 x 4.5IIR Butyl75 Shore ANee52 icon
O-Ring 190 X 5 IIR75 Black O-ring Black190 x 5IIR Butyl75 Shore ANee60 icon
O-Ring 355.19 X 3.53 IIR75 Black O-ring Black355.19 x 3.53IIR Butyl75 Shore ANee54 icon
O-Ring 68 X 4 IIR75 Black O-ring Black68 x 4IIR Butyl75 Shore ANee50 icon
O-Ring 140 X 3.5 IIR75 Black O-ring Black140 x 3.5IIR Butyl75 Shore ANee58 icon
O-Ring 40 X 2.5 IIR75 Black O-ring Black40 x 2.5IIR Butyl75 Shore ANee55 icon
O-Ring 202.6 X 7 IIR75 Black O-ring Black202.6 x 7IIR Butyl75 Shore ANee60 icon
O-Ring 130 X 4 IIR75 Black O-ring Black130 x 4IIR Butyl75 Shore ANee54 icon
O-Ring 28 X 5 IIR75 Black O-ring Black28 x 5IIR Butyl75 Shore ANee57 icon