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

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

  Very low outgassing
  Excellent computer sealing and vibration dampening compounds
  Low extractibles, possible medical applications

Compounds 359CY, 359DQ, 501C, 359DN

  Good acid and base resistance
  Weather and high temperature resistant