IIR O-rings 70 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 70 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 70 Shore A made from IIR, please send us a Direct Enquiry. Together we can discuss the specifications and find the right product for you.

64 products
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ProductDimensionsMaterialHardness (Shore A)CertificationStock
O-Ring 104.37 X 3.53 IIR70 Black O-ring Black104.37 X 3.53IIR Butyl70 Shore ANee58 icon
O-Ring 189.87 X 5.33 IIR70 Black O-ring Black189.87 X 5.33IIR Butyl70 Shore ANee57 icon
O-Ring 54 X 4 IIR70 Black O-ring Black54 X 4IIR Butyl70 Shore ANee53 icon
O-Ring 72.62 X 3.53 IIR70 Black O-ring Black72.62 X 3.53IIR Butyl70 Shore ANee59 icon
O-Ring 750 X 7 IIR70 Black O-ring Black750 X 7IIR Butyl70 Shore ANee50 icon
O-Ring 62 X 4 IIR70 Black O-ring Black62 X 4IIR Butyl70 Shore ANee58 icon
O-Ring 8.5 X 3 IIR70 Black O-ring Black8.5 X 3IIR Butyl70 Shore ANee56 icon
O-Ring 40.95x2.62 IIR - 70 Shore A - Black - ses-304796 O-ring Black40.95 X 2.62IIR Butyl70 Shore ANee51 icon
O-Ring 516 X 6 IIR70 Black O-ring Black516 X 6IIR Butyl70 Shore ANee53 icon
O-Ring 9 X 1.5 IIR70 Black O-ring Black9 X 1.4IIR Butyl70 Shore ANee55 icon
O-Ring 2.9x1.78 IIR - 70 Shore A - Black - ses-320273 O-ring Black2.9 X 1.78IIR Butyl70 Shore ANee60 icon
O-Ring 120.25 X 3.53 IIR70 Black O-ring Black120.25 X 3.53IIR Butyl70 Shore ANee52 icon
O-Ring 56.74x3.53 IIR - 70 Shore A - Black - ses-330518 O-ring Black56.74 X 3.53IIR Butyl70 Shore ANee52 icon
O-Ring 51 X 2.5 IIR70 Black O-ring Black51 X 2.4IIR Butyl70 Shore ANee53 icon
O-Ring 54 X 2 IIR70 Black O-ring Black54 X 2IIR Butyl70 Shore ANee51 icon
O-Ring 148 X 6 IIR70 Black O-ring Black148 X 6IIR Butyl70 Shore ANee55 icon
O-Ring 209.14 X 3.53 IIR70 Black O-ring Black209.14 X 3.53IIR Butyl70 Shore ANee53 icon
O-Ring 4 X 1 IIR70 Black O-ring Black4 X 1IIR Butyl70 Shore ANee58 icon
O-Ring 13 X 2 IIR70 Black O-ring Black13 X 2IIR Butyl70 Shore ANee53 icon
O-Ring 100 X 5 IIR70 Black O-ring Black100 X 5IIR Butyl70 Shore ANee55 icon
O-Ring 183.52 X 6.99 IIR70 Black O-ring Black183.52 X 6.99IIR Butyl70 Shore ANee54 icon
O-Ring 354 X 8 IIR70 Black O-ring Black354 X 8IIR Butyl70 Shore ANee60 icon
O-Ring 648 X 6 IIR70 Black O-ring Black648 X 6IIR Butyl70 Shore ANee57 icon
O-Ring 254 X 3 IIR70 Black O-ring Black254 X 3IIR Butyl70 Shore ANee50 icon
O-Ring 50 X 4 IIR70 Black O-ring Black50 X 4IIR Butyl70 Shore ANee53 icon
O-Ring 274 X 2 IIR70 Black O-ring Black274 X 1IIR Butyl70 Shore ANee55 icon
O-Ring 5.28x1.78 IIR - 70 Shore A - Black - ses-304795 O-ring Black5.28 X 1.78IIR Butyl70 Shore ANee55 icon
O-Ring 15 X 1.5 IIR70 Black O-ring Black15 X 1.4IIR Butyl70 Shore ANee60 icon
O-Ring 44.04x3.53 IIR - 70 Shore A - Black - ses-327571 O-ring Black44.04 X 3.53IIR Butyl70 Shore ANee53 icon
O-Ring 190 X 5.5 IIR70 Black O-ring Black190 X 5.4IIR Butyl70 Shore ANee54 icon
O-Ring 230 X 10 IIR70 Black O-ring Black230 X 10IIR Butyl70 Shore ANee52 icon
O-Ring 145.72 X 2.62 IIR70 Black O-ring Black145.72 X 2.62IIR Butyl70 Shore ANee53 icon
O-Ring 270 X 6 IIR70 Black O-ring Black270 X 6IIR Butyl70 Shore ANee55 icon
O-Ring 270 X 5 IIR70 Black O-ring Black270 X 5IIR Butyl70 Shore ANee60 icon
O-Ring 42 X 5 IIR70 Black O-ring Black42 X 5IIR Butyl70 Shore ANee57 icon
O-Ring 18.72x2.62 IIR - 70 Shore A - Black - ses-1824 O-ring Black18.72 X 2.62IIR Butyl70 Shore ANee60 icon
O-Ring 355 X 4 IIR70 Black O-ring Black355 X 4IIR Butyl70 Shore ANee55 icon
O-Ring 208 X 4 IIR70 Black O-ring Black208 X 4IIR Butyl70 Shore ANee58 icon
O-Ring 285 X 4 IIR70 Black O-ring Black285 X 4IIR Butyl70 Shore ANee59 icon
O-Ring 14 X 1.78 IIR70 Black O-ring Black14 X 1.78IIR Butyl70 Shore ANee54 icon