Styrene-Butadiene Polymer (SBR)
- Polymers
- CAS 9003-55-8
- IUPAC: 1,3-Butadiene, ethenylbenzene, polymer
CarCareTruth tracks Styrene-Butadiene Polymer (SBR) (CAS 9003-55-8) as a car-care ingredient.
Polymer — low bioavailability in finished cured form. Residual styrene monomer content is the relevant health concern during application (styrene is a Prop 65 carcinogen) but residual levels in finished SBR polymer are typically below regulatory thresholds. The polymer itself is not Prop 65–listed. SDS: LD50 > 5,000 mg/kg (oral), dermal LD50 > 2,000 mg/kg.
Styrene-butadiene rubber (SBR, CAS 9003-55-8) is one of the most widely used synthetic elastomers, produced by copolymerizing styrene and 1,3-butadiene. In rubberized undercoating formulas, SBR contributes flexibility and toughness to the cured asphalt-rubber film, helping it accommodate the thermal expansion and contraction of vehicle metal surfaces across seasonal temperature extremes without cracking. It is distinct from the crosslinked variant (butadiene-styrene-meta-divinylbenzene polymer, CAS 26471-45-4) also present in this formula.
Health & environment profile
- VOC
- no
- Prop 65 listed
- no
- Asthmagen
- no
- EPA Safer Choice
- no
- Aquatic toxicity
- no
- Biodegradable
- no
- Bioaccumulative
- no
- Persistent
- yes
- Ozone depleting
- no
- Microplastic
- no
- PFAS
- no
- Env. score
- 5/5
Common questions about Styrene-Butadiene Polymer (SBR)
- What is Styrene-Butadiene Polymer (SBR) used for in car care?
- Synthetic rubber binder in rubberized coatings; provides flexibility, toughness, and adhesion in cured film
- Is Styrene-Butadiene Polymer (SBR) a VOC?
- No. Styrene-Butadiene Polymer (SBR) is not classified as a volatile organic compound (VOC).
- Is Styrene-Butadiene Polymer (SBR) on California's Proposition 65 list?
- No. Styrene-Butadiene Polymer (SBR) is not on California's Proposition 65 list.
No products on file contain this (yet)
Related
Health and environment notes translate the manufacturer Safety Data Sheet, the GHS classification, and authoritative regulatory listings (California Prop 65, EPA). Not medical advice. They describe the ingredient itself; whether a hazard applies to a finished product depends on its concentration and how it's used.