Ethylene/Propylene Copolymer

AKA: EPR, Ethylene propylene rubber

Synthetic

Occlusive

Clean

OriginDerived from ethylene and propylene, both petroleum-based hydrocarbons from crude oil refining. Synthesized through catalytic polymerization of these monomers to create long-chain polymer chains.

Ethene, polymer with propene

CAS #

9010-79-1

Form

Liquid

State

Solid

Skin Types

●all-skin-types

Best For

General

Pregnancy & Breastfeeding Safe

Yes

Functions

Abrasive

Bulking

Film Forming

Creates a physical seal on skin to lock moisture in and keep irritants out. The "slugging" ingredient — barrier protection.

Physical Exfoliant

Adds Body & Volume

Creates Protective Barrier

Antioxidant Protection

Gently polishes surface

Creates protective layer

Adds volume

The paper trail

🔬Peer-reviewed1 paper →

⚖️Regulatory1 listing →

🛡️Safety-assessed2 reviews →

Counts, not a verdict. A listing isn't a study. The trail, you decide.

EWG

CIR

Safe as used

Pregnancy

Yes

Concentration Guide

Leave-on0.0063–12.5%

Rinse-off2%

0%50%100%

CIR reported use · 2013 survey

Regulatory Status

USA✔ permitted

EU⚠ restricted

JAPAN⚠ restricted

CANADA⚠ restricted

Regulatory Agencies

EWG CIR FDA EU COSING Health Canada

Verified Jun 2026

Data: CosIng · EWG · CIR