Group R Compounds

IIR: butyl
Commercial names: Polysar Butyl (Polymer Corp.), Enjay Butyl (Enjay Chem. Co.), Petro-Tex Butyl (Petro-Tex Chem. Co.), Bucar (Cities Service Co.), Exxon Butyl (Exxon Chem Co.).
Butyl based rubbers (isobutyl and isoprene) present a very dense molecular structure, which offers a lot or resistance to the passage of gas, therefore they are particularly suitable for vacuum seal and high pressure gas applications, also presenting a high resistance to breakage. They also have good electrical insulation characteristics.

Temperature table
Maximum temperature
Minimum temperature
Fluid compatibility table
No compatible
  • Mineral oils
  • Silicone oils and greases
  • Fluids for refrigeration
  • Aliphatic hydrocarbons
  • Oxygen, Ozone, Nitrogen
  • Aromatic and chlorinated hydrocarbons
  • Glycol based fluids
  • Polar solvents
The Elastotech code for this compound is: ME13XX/YY.
Elastic compound for O-rings