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STYRENE BUTADIENE RUBBER (SBR): BUNA S MATERIAL

SBR is probably better known under its old names Buna S (Buna material) and GRS (government rubber styrene). It was first produced under government control between 1930 and 1950, which was used 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. Its modern usage is external to the sealing industry. Therefore, it’s mainly used for automobile tires and conveyor belts.

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

Names: Styrene ButadieneBuna SSBRGRS

Compound Info

ASTM D1418 DesignationSBR
ASTM D2000/SAE J200 Type, ClassAA, BA
Hardness (Shore A)40-90
Colorblack

Thermal Properties

Min Temp.-50°F (-45°C)
Max Temp.212°F (100°C)

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

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.

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