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Isobutylene Isoprene Rubber

Isobutylene Isoprene Rubber (IIR)

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. It is known for its excellent resistance to water, steam, alkalis, and oxygenated solvents. Another outstanding characteristic is low gas permeation. Butyl is capable of providing high-energy absorption (dampening) and good hot tear strength.

Good resistance to heat, abrasion, oxygen, ozone and sunlight are dependent upon the butyl polymer saturation level. Butyl however, displays poor resistance to petroleum oil, gasoline and hydrocarbon solvents.

Compounds 487KC, 487KD, 487KE, 487KF

  • Very low outgassing
  • Excellent vibration dampening compounds
  • Low extractables

Compounds 359DQ, 501C, 359DN

  • Good acid and base resistance
  • Weather and high temperature resistant
CompoundHardness Shore ATensile MPaTensile psiElongation (%)
359DQ608.31200400
501C7013.82000320
359DN808.31200370
487KC409.01300850
487KD509.01300650
487KE609.71400420
487KF708.31200300

Chemical and Physical Tables

Click below to view the Elastomers/Materials: Chemical and Physical Tables PDF