Frequently Asked Questions — SBR O-Rings
What is SBR styrene-butadiene rubber?
SBR (Styrene Butadiene Rubber) is one of the most produced synthetic rubbers globally, originally developed as an alternative to natural rubber. It offers good abrasion resistance, acceptable aging characteristics, and low cost. SBR shares the chemical resistance profile of natural rubber — suitable for water and brake fluids, incompatible with petroleum products.
What temperature range can SBR o-rings handle?
SBR o-rings operate from −40 °C to +100 °C. Heat resistance is limited compared with most synthetic elastomers, and extended use above 80 °C will accelerate aging. Cold-temperature flexibility is good but not as broad as silicone or PVMQ grades.
What chemicals is SBR resistant to?
SBR has good resistance to water, dilute acids and alkalis, alcohols, DOT 3 and DOT 4 glycol-based brake fluids, and ketones. It is not compatible with petroleum oils, mineral hydraulic fluids, fuels, aromatic solvents, or concentrated acids — contact with these causes rapid swelling and degradation.
What are typical applications for SBR o-rings?
SBR o-rings are used in hydraulic brake systems with DOT-specification glycol fluid, water and wastewater pipework, domestic plumbing fittings, and general industrial applications where petroleum resistance is not required and material cost is a priority. SBR is rarely the first choice for new designs but remains common in legacy brake and water systems.