AS568-023 Butyl Rubber (IIR) 70 Duro Round O-Rings Black

1-1/16"ID X 1-3/16"OD X 1/16"CS

Butyl Rubber (IIR) 70 Duro Round O-Rings Black

Butyl rubber is composed by copolymerizing isobutylene which is with small amount of isoprene. It is like EPDM possessing excellent resistance to chemical and polar fluid, outstanding electrical insulation and good ozone resistance. The special properties of butyl rubber are low gas and moisture permeability and high shock absorption. These properties have made butyl rubber the polymer choice in a variety of applications.

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.


  • Model: IIR70023
    Dimensions: 1-1/16"ID X 1-3/16"OD X 1/16"CS
    Actual: 1.051"ID X 0.070"CS
    Metric: 26.7mm ID X 1.78mm CS
  • 474 in Stock
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