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Did you know?
Butyl is impermeable to air and it is normally used on the inside of basketballs to stop them from deflating!
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Butyl Isobutylene Isoprene Rubber (IIR)
Butyl rubber is a copolymer of isobutylene and isoprene that was first produced by William Sparks and Robert Thomas at the Standard Oil Company (now Exxon Corporation) in 1937.
It has excellent impermeability, and good flex properties. A colourless to light yellow material, it is generally odourless and tasteless, though it may exhibit a slight characteristic odour.
Used in linings and inner tubes, tyres, hoses & conveyor belts.
Advantages: Good ozone and weathering resistance; very low permeability to gasses; high energy absorption; high heat resistance.
Limitations: Only moderate abrasion and compression set; low tensile strength and resilience; readily combustible.
Very slow curing unless modified to chloro and bromo butyl (CIIR & BIIR).
Download Butyl Isobutylene Isoprene Rubber (IIR) Data Sheet