Styrene Butadiene Rubber (SBR): Buna S Material | Seal & Design

Styrene Butadiene Rubber (SBR): Buna S Material

Buna MaterialSBR probably is better known under its old names Buna S and GRS (government rubber styrene.) SBR was first produced under government control between 1930 and 1950 as a replacement for natural rubber. The basic monomers are butadiene and styrene, with styrene content approximately 23.5%. About one third of the world output of SBR is used in tire production. SBR is mostly used in seals for non-mineral oil based brake fluid applications. It's modern usage is external to the sealing industry; it's mainly used for automobile tires and conveyor belts.

Both o-rings and gaskets can be made from Buna materials.

Names: Styrene Butadiene, Buna S, SBR, GRS

Compound Info
ASTM D1418 Designation SBR
ASTM D2000/SAE J200 Type, Class AA, BA
Hardness (Shore A) 40-90
Color black
Thermal Properties
Min Temp. -50°F (-45°C)
Max Temp. 212°F (100°C)

Compatibility

Chemical Resistance
Chemical Resistance
Water, alcohol, glycol, and certain ketones (acetone)
Non-mineral oil based brake fluid
Silicone oil and grease
Diluted water solutions, weak acids
Not compatible
NOT compatible
Mineral oils
Petroleum greases and fuels
Aliphatic hydrocarbons (benzene, toluene, xylol)
Chlorinated hydrocarbons - such as chloroform, trichlorethylene, carbon tetrachloride
Oxidizing media like nitric acid, chromic acid, hydrogen peroxide, chlorine, bromine

Disclaimer: These are general guidelines only. All materials should be tested in your application.