Butyl Rubber (IIR)

- Sep 01, 2017-

General Information

  • ASTM D2000                  AA, BA

  • SAE J 200 Codes 

  • Relative Cost                  Low


Primary Uses

  • Automotive vibration control

  • Pharmaceutical industry: Closures for containers

  • Vacuum applications

Performs Well in…

  • Polar solvents, e.g. alcohols, ketones, esters

  •  Salt solutions

  • Dilute acids and Alkalis

  • Silicone oils & greases

  • Water and Steam

  • Phosphate ester based hydraulic

  • Fluids – Skydrol®

  • Ozone, aging & weathering

Doesn’t Perform Well in…

  • Petroleum based oils & greases

  • Aliphatic & aromatic hydrocarbons

  • Halogenated solvents


Butyl is a common term used for the isobutylene isoprene elastomer. As the name implies, butyl is comprised of isobutylene with a small amount of isoprene. With outstanding low permeability to gases, Butyl is especially effective in vacuum sealing applications. Butyl is capable of providing high-energy absorption (dampening) and good tear strength. Butyl is like EPDM possessing excellent resistant to chemical and polar fluids, outstanding electrical insulation and good ozone resistance.

Application Advantages

  •  Low gas permeability

  • Good ozone and weather resistance

  • Good vibration damper


  • Because it is a petroleum product, Butyl has poor resistance to hydrocarbonsolvents and oils, and diester-based lubricants.

  • Butyl has an inferior high temperature limit when compared to EPDM andhas been largely replaced by Ethylene Propylene (EPDM).

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