Styrene Butadiene Rubber (SBR): Buna S Material
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. 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
|ASTM D1418 Designation||SBR|
|ASTM D2000/SAE J200 Type, Class||AA, BA|
|Hardness (Shore A)||40-90|
|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.