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Butyl Rubber (IIR)

Butyl Rubber (IIR) is a copolymer of isobutylene and a small amount of isoprene.

Features:

– Butyl rubber is impermeable to most common gasses and has a good resistance to the effects of sunlight and ozone. Butyl rubber has a very low resilience, which makes it ideal for vibration damping and shock absorption applications but offer a moderate resistance to abrasion and compression set.

– It is not recommended to use Butyl Rubber with petroleum solvent, coal tar or aromatic hydrocarbons.

– Blending is not recommended for Butyl rubber since the rate of cure of other elastomer in the blend is often much faster than the rate of cure of the Butyl rubber.

Application:

  • Inner tubes for tires
  • Dampers/bridge bearing pads
  • Construction sealants
  • Hoses
Properties IIR (Butyl)
Hardness Range 40 – 90
Heat Resistance Very Good
Ozone & Weathering Good
Oil Resistance Poor
Mechanical Strength Excellent
Compression Set Fair to Good
Tear & Abrasion Resistance Good
Flame Resistance Good
Water Resistance Excellent