Styrene-Butadiene (SBR)

- Sep 02, 2017-

General Information
ASTM D2000
SAE J 200 Codes AA, BA
Relative Cost Low


Primary Uses

  • Hydraulic brake systems seals and diaphragms

  • Plumbing applications

Performs Well in…

  • Water

  • Alcohol

  • Silicone oil and grease

  • Non-mineral oil based brake fluid

  • Weak acids

Doesn’t Perform Well in…

  • Petroleum oils and fuels

  • Aromatic, aliphatic, or halogenated hydrocarbons

  • Strong acids

  • Mineral oils

SBR is a copolymer of styrene and butadiene. Compound properties are similar to those of natural rubber. It is also known as Buna S, or GR-S (Government RubberStyrene). SBR was first produced under government control between 1930 and 1950 as a replacement for natural rubber.
The main use for styrene butadiene today is in the manufacture of automobile tires. O-ring usage has been on decline since the introduction of ethylene propylene (EPDM). SBR is mostly used in seals for non-mineral oil based brake fluid applications.

Application Advantages

  • Good resistance to brake fluids

  • Good resistance to water


  • Poor petroleum oil and solvent resistance

  • Poor weather resistance

  • Seldom used in modern sealing applications

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