IIR – Butyl Rubber

Butyl rubber, also known as Isobutylene-isoprene (IIR), is a synthetic rubber developed in the 1940’s.

  • It has exceptionally low gas permeability making it ideal for inner tubes and high pressure/vacuum sealing applications.
  • Very low resilience makes it suitable for shock and vibration damping.
  • Its chemical unsaturation gives it excellent resistance to heat, ozone, and weathering, and also to dilute acids and alkalis.
  • Not suitable for use in mineral or petroleum based fluids.
  • Typical applications include diaphragms, gaskets, inner tubes, liners, O-rings, seals, speaker surrounds and bottle closures.
  • Typical working temperature range: -50°C to +100°C