Ethylene/ Propylene/ Styrene Copolymer

Ethylene/ Propylene/ Styrene Copolymer molecular structure
molecular structure · PubChem
AKA: Styrenic Copolymer
Synthetic
Occlusive
Clean
OriginProduced from petroleum-derived monomers: ethylene, propylene, and styrene hydrocarbons. Synthesized through free-radical polymerization of the three monomers to create a copolymer chain.
Ethylene/ Propylene/ Styrene Copolymer is a cosmetic ingredient. Rated low hazard by EWG.
CAS #
66070-58-4
Form
Liquid
State
Solid
Skin Types
●all-skin-types, gentle
Best For
General
Pregnancy & Breastfeeding Safe
Yes
Functions
Film Forming
Creates a physical seal on skin to lock moisture in and keep irritants out. The "slugging" ingredient — barrier protection.
Viscosity Controlling
Controls Viscosity
Antioxidant Protection
Reduces Inflammation
Locks In Moisture
The paper trail
🔬Peer-reviewednone on file
⚖️Regulatory0 listings
🛡️Safety-assessed1 review →
Counts, not a verdict. A listing isn't a study. The trail, you decide.
EWG
2
CIR
Safe
Pregnancy
Yes
Concentration Guide
Leave-on0.075–8.2%
Rinse-off0.18%
0%50%100%
CIR reported use · 2014 survey
Regulatory Status
USA✔ permitted
EU⚠ restricted
JAPAN⚠ restricted
CANADA⚠ restricted
Verified Jun 2026
Data: CosIng · EWG · CIR