Butylene/ Ethylene/ Styrene Copolymer

Butylene/ Ethylene/ Styrene Copolymer 1
AKA: Styrenic Copolymer
Synthetic
Occlusive
Clean
Butylene/ Ethylene/ Styrene Copolymer is a cosmetic ingredient. Rated low hazard by EWG.
CAS #
68648-89-5
Form
Liquid
State
Solid
Functions
Film Forming
Creates a physical seal on skin to lock moisture in and keep irritants out. The "slugging" ingredient — barrier protection.
Viscosity Controlling
Anti-Inflammatory
Boosts Collagen
Wound Healing
Controls product thickness
Traditional Use
A synthetic polymer developed in the mid-20th century for use in cosmetics and personal care products, primarily functioning as a film-forming and suspending agent in formulations.
EWG
2
CIR
Safe
Pregnancy
Yes
CIR Safety Findings
ewg-2
pregnancy-nursing-safe
all-shades-safe
Regulatory Status
USA✔ permitted
EU⚠ restricted
JAPAN⚠ restricted
CANADA⚠ restricted
Skin Types
●all-skin-types, gentle
Best For
General
Pregnancy & Breastfeeding Safe
Yes
The paper trail
🔬Peer-reviewed1 paper →
⚖️Regulatory0 listings
🛡️Safety-assessed1 review →
Counts, not a verdict. A listing isn't a study. The trail, you decide.
Verified Jun 2026
Data: CosIng · EWG · CIR