Styrene-Butadiene Rubber (SBR)
The most widely used synthetic rubber in the world is SBR, a copolymer of styrene and butadiene. SBR was also 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 of 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.
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
Standard Low Temperature: -55°C / -67°F
Standard High Temperature: 100°C / 212°F
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