Styrene-Butadiene Rubber (SBR)
Styrene-Butadiene, which is a copolymer of styrene and butadiene, is the most widely used synthetic rubber in the world. SBR is also known as Buna S, from the trade name by Bayer, and GR-S (Government Rubber Styrene). SBR rubber is used primarily in the manufacturing of tires by blending it with natural rubber and butadiene rubber. SBR is considered weak and unusable, but when reinforced with carbon black it is strong and abrasion resistant. SBR has poor resistance to oil, and is not suitable in weathering, UV, oxygen, ozone because of the double bond in the polymer backbone.
SBR is found in:
- Tire production
- Isolation dampeners
- Conveyor belts
Standard Compound: -55°C (-67°F) to 100°C (212°F)
Hardness: 50 to 70 Shore A
ASTM D1418 Designation: SBR
ASTM D2000 Designation: AA, BA
Standard Colors: Black
Standard SBR compounds are sulfur-cured.
SBR rubber compounds perform well in water, alcohol, silicone oil and grease, non-mineral oil based brake fluid, and weak acids.
SBR rubber compounds are susceptive to petroleum oils and fuels, strong acids, UV, ozone, mineral oils, and aromatic, aliphatic, or halogenated hydrocarbons.