Butyl 70 Durometer O-Ring, Mil/Aero (B0318-70 AMS)

Parker's 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
• Used for AMS 3238

*Custom sizes and coatings/markings are available upon request. Contact Parker O-Ring Division at 859-269-2351 for design and pricing assistance.