IIR O-rings 55 Shore A

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ProductDimensionsMaterialHardness (Shore A)CertificationStock
O-Ring 13.94 X 2.62 IIR55 Black O-ring Black13.95 mm  x 2.62 mm IIR Butyl55 Shore A Neeicon-bekijk icon
O-Ring 42.2 X 3 IIR55 Black O-ring Black42.3 mm  x 3 mm IIR Butyl55 Shore A Neeicon-bekijk icon
O-Ring 117 X 4 IIR55 Black O-ring Black117 mm  x 4 mm IIR Butyl55 Shore A Neeicon-bekijk icon
O-Ring 54 X 3 IIR55 Black O-ring Black54 mm  x 3 mm IIR Butyl55 Shore A Neeicon-bekijk icon
O-Ring 215 X 5 IIR55 Black O-ring Black215 mm  x 5 mm IIR Butyl55 Shore A Neeicon-bekijk icon
O-Ring 265 X 5 IIR55 Black O-ring Black266 mm  x 5 mm IIR Butyl55 Shore A Neeicon-bekijk icon

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 55 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 55 Shore A made from IIR, please send us a Direct Enquiry. Together we can discuss the specifications and find the right product for you.