SBR Styrene Butadiene Rubber | Buna S | Seal & Design

SBR Stryrene-Butadiene

General Characteristics

SBR 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.

Temperature Properties

Heat Heat Resistance Up to approximately 225°F (107°C).
Cold Cold Flexibility Down to approximately –70°F (–57°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

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