Polystyrene/Hydrogenated Polyisopentene Copolymer

AKA: Polystyrene Copolymer, Synthetic Polymer

Synthetic

Not Clean

Copolymer of polystyrene and hydrogenated polyisopentene

CAS #

-

Form

Liquid

State

Solid

Functions

Light Stabilizer

Viscosity Controlling

Shields from UV damage

Traditional Use

Developed in the late 20th century as a synthetic polymer designed to provide film-forming and conditioning properties in cosmetics. Created to replace natural waxes and resins in formulations requiring durability and water resistance.

EWG

CIR

Safe as used

Pregnancy

Yes

CIR Safety Findings

medical-approval

all-shades-safe

Regulatory Status

USA✔ permitted

EU⚠ restricted

JAPAN⚠ restricted

CANADA⚠ restricted

Regulatory Agencies

EWG CIR FDA EU COSING Health Canada

Skin Types

●all-skin-types

Best For

General

Pregnancy & Breastfeeding Safe

Yes

The paper trail

🔬Peer-reviewednone on file

⚖️Regulatory1 listing →

🛡️Safety-assessed1 review →

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

Verified Jun 2026

Data: CosIng · EWG · CIR