Buna S

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Buna S or Styrene-Butadiene (SBR) is an elastomeric copolymer consisting of styrene and butadiene. It has good abrasion resistance and good aging stability. SBR is stable in: mineral oils, fats, aliphatic, aromatic and chlorinated hydrocarbons. The production process is initiated by sodium.

The rubber was named Buna S, were Bu stands for butadiene, na for sodium (natrium) in German and S for styrene.

Possible temperature range: approx. -40 to +100 °C (-40 to +212 °F)
Chemical Type: styrene-butadiene (copolymer)
Trade names (common): GRS, Buna S (SBR)
Elongation (%): 450-500
Useful temperature range: -60 to 120 degrees Celsius (-75 to 250 degrees Fahrenheit)
Major application characteristics: good physical properties; excellent abrasion resistance; not oil, ozone, or weather resistant; electrical properties good, but not outstanding
Typical applications: pneumatic tires and tubes; heels and soles; gaskets