Group R Compounds

CIIR: chlorobutyl
Commercial name: Esso Butyl (Esso).
Chlorobutyl rubber is obtained by the addition of chlorine to the compound for butyl rubber (IIR). The result obtained is a rubber that presents the characteristics of butyl rubbers, but with a better elastic behaviour: there is an increase in the Compression Set value especially at low temperatures.

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: ME15XX/YY.
Elastic compound for O-rings