Butyl Rubber (IIR)

Butyl (isobutylene, isoprene rubber, IIR) has a very low permeability rate and good electrical properties.

Heat resistance

• Up to approximately 121°C (250°F).

Cold flexibility

• Down to approximately -59°C (-75°F ).

Chemical resistance

• Hot water and steam up to 121°C (250°F).

• Brake fluids with glycol base (Dot 3 & 4).

• Many acids (see Fluid Compatibility Tables in Section VII).

• Salt solutions.

• Polar solvents, (e.g. alcohols, ketones and esters).

• Poly-glycol based hydraulic fluids (HFC fluids) and phosphate-ester bases (HFD-R fluids).

• Silicone oil and grease.

• Ozone, aging and weather resistant.

Not compatible with:

• Mineral oil and grease.

• Fuels.

• Chlorinated hydrocarbons.