Butyl Acrylate/Styrene Copolymer
AKA: Acrylic Copolymer
Synthetic
Occlusive
Clean
2-Propenoic acid, butyl ester, polymer with ethenylbenzene
CAS #
25767-47-9
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.
Anti-Inflammatory
Boosts Collagen
Wound Healing
Creates protective layer
Traditional Use
A synthetic polymer developed in the mid-20th century for cosmetic applications as a film-former and adhesive. Used in products like masques and long-wear formulations.
EWG
1
CIR
Safe as used
Pregnancy
Yes
Restricted By
CIR Safety Findings
ewg-1
medical-approval
pregnancy-nursing-safe
all-shades-safe
Regulatory Agencies
Skin Types
●all-skin-types, gentle
Best For
General
Pregnancy & Breastfeeding Safe
Yes
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