Unsaturated copolymer of Isobutylene and Isoprene butyl.
Good damping and shock absorption characteristics. Extremely low gas permeability. Good resistance to ozone, UV light, moisture and mineral acids, polar liquids such as oxygenated solvents, ester type plasticizers, vegetable oils and synthetic hydraulic fluids, MEK, Phosphate ester type hydraulic fluids (e.g. Skydrol®, Fyrquel®, Pydraul®), Silicone fluids and greases. Attacked by non-polar solvents, such as hydrocarbon oils, greases and fuels, di-ester based lubricants, hydrocarbon solvents and oils.
