Styrene-Butadiene Rubber (SBR)

The most widely used synthetic rubber in the world is SBR, a copolymer of styrene and butadiene. SBR also was called Buna S (from the first trade name of Bayer). Where SBR rubber is used the most is in tire by blending it with natural rubber and butadiene rubber. SBR is weak and unusable without reinforcement by carbon black, but with carbon black it is strong and abrasion–resistant. The defects of SBR are poor resistant to oil and not suitable in weathering, UV, oxygen, ozone because the double bond in the polymer backbone.
Cure system - Sulfur-Cured

Standard SBR compounds are sulfur-cured.
Other Common Variations

SBR is usually mixed with NR and BR and applied in tire productions
SBRs are mostly applied seals for non-mineral oil based brake fluid.
General Information

ASTM D 1418 Designation: SBR
ISO/DIN 1629 Designation: SBR
ASTM D2000 / SAE J 200 Codes: AA, BA
Standard Color(s): Black
Hardness Range: 50 to 70 Shore A
Relative Cost: Low
Service Temperatures
Standard Low Temperature: -55°C / -67°F
Standard High Temperature: 100°C / 212°F 

Performs Well In...

Doesn't Perform Well In...

  • Water
  • Alcohol
  • Silicone oil and grease
  • Non-mineral oil based brake fluid
  • Weak acids
  • Petroleum oils and fuels
  • Aromatic, aliphatic, or halogenated
  • Hydrocarbons
  • Strong acids
  • Mineral oils
Buna® is a registered trademark of LANXESS.