IIR O-rings 70 Shore A

Product		Dimensions	Material	Hardness (Shore A)	Certification	Stock
	O-ring Black	517 mm  x 6 mm	IIR Butyl	70 Shore A	Nee
	O-ring Black	91 mm  x 1.5 mm	IIR Butyl	70 Shore A	Nee
	O-ring Black	2.9 mm  x 1.78 mm	IIR Butyl	70 Shore A	Nee
	O-ring Black	120.26 mm  x 3.53 mm	IIR Butyl	70 Shore A	Nee
	O-ring Black	56.75 mm  x 3.53 mm	IIR Butyl	70 Shore A	Nee
	O-ring Black	51 mm  x 2.5 mm	IIR Butyl	70 Shore A	Nee
	O-ring Black	54 mm  x 2 mm	IIR Butyl	70 Shore A	Nee
	O-ring Black	148 mm  x 6 mm	IIR Butyl	70 Shore A	Nee
	O-ring Black	104.38 mm  x 3.53 mm	IIR Butyl	70 Shore A	Nee
	O-ring Black	4 mm  x 1 mm	IIR Butyl	70 Shore A	Nee
	O-ring Black	13 mm  x 2 mm	IIR Butyl	70 Shore A	Nee
	O-ring Black	100 mm  x 5 mm	IIR Butyl	70 Shore A	Nee
	O-ring Black	183.53 mm  x 6.99 mm	IIR Butyl	70 Shore A	Nee
	O-ring Black	354 mm  x 8 mm	IIR Butyl	70 Shore A	Nee
	O-ring Black	649 mm  x 6 mm	IIR Butyl	70 Shore A	Nee
	O-ring Black	254 mm  x 3 mm	IIR Butyl	70 Shore A	Nee
	O-ring Black	50 mm  x 4 mm	IIR Butyl	70 Shore A	Nee
	O-ring Black	275 mm  x 2 mm	IIR Butyl	70 Shore A	Nee
	O-ring Black	5.28 mm  x 1.78 mm	IIR Butyl	70 Shore A	Nee
	O-ring Black	15 mm  x 1.5 mm	IIR Butyl	70 Shore A	Nee
	O-ring Black	44.05 mm  x 3.53 mm	IIR Butyl	70 Shore A	Nee
	O-ring Black	190 mm  x 5.5 mm	IIR Butyl	70 Shore A	Nee
	O-ring Black	231 mm  x 10 mm	IIR Butyl	70 Shore A	Nee
	O-ring Black	145.73 mm  x 2.62 mm	IIR Butyl	70 Shore A	Nee

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.