Butene/Propylene Copolymer

AKA: Olefin Copolymer

Synthetic

Occlusive

Not Clean

OriginDerived from petroleum-based hydrocarbons, specifically propylene and butene monomers from crude oil refining. Synthesized through catalytic polymerization, where propylene and butene molecules are chemically linked to form long-chain polymer chains.

Butene/Propylene Copolymer is a copolymer of butene and propylene monomers.

CAS #

29160-13-2

Form

Liquid

State

Solid

Skin Types

●all-skin-types

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

Creates Protective Barrier

Controls Viscosity

Creates protective layer

Controls product thickness

The paper trail

🔬Peer-reviewed1 paper →

⚖️Regulatory1 listing →

🛡️Safety-assessed1 review →

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

EWG

CIR

Safe as used

Pregnancy

Yes

Concentration Guide

CIR lists it as not reported to be in use.

CIR · report published 2020

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