Styrene/Butadiene Copolymer
AKA: Synthetic rubber, Styrene-butadiene polymer
Synthetic
Clean
Benzene, ethenyl-, polymer with 1,3-butadiene
CAS #
9003-55-8
Form
Liquid
State
Solid
Functions
Opacifying
Adds Opacity
Creates creamy opacity
Traditional Use
A synthetic rubber polymer developed in the mid-20th century, originally for industrial applications before being adapted for use in cosmetics as a film-forming and conditioning agent.
EWG
1
CIR
Safe as used
Pregnancy
Caution
Restricted By
CIR Safety Findings
medical-approval
all-shades-safe
Regulatory Agencies
Skin Types
●all-skin-types
Best For
General
Pregnancy & Breastfeeding Safe
Caution
The paper trail
🔬Peer-reviewednone on file
⚖️Regulatory1 listing →
🛡️Safety-assessed2 reviews →
Counts, not a verdict. A listing isn't a study. The trail, you decide.
Verified Jun 2026
Data: CosIng · EWG · CIR