Hydrogenated Styrene Isoprene Copolymer

AKA “● 2-METHYLBUTA-1, POLYMER WITH 2-METHYL-1, 3-BUTADIENE”

Synthetic

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Ingredient Facts

Hydrogenated styrene isoprene copolymer

AKA: ● 2-METHYLBUTA-1, POLYMER WITH 2-METHYL-1, 3-BUTADIENE

Synthetic · Film Forming · EWG: 1

Synthetic

Occlusive

Synthetic

Clean

Hydrogenated Styrene Isoprene Copolymer is a cosmetic ingredient. Rated low hazard by EWG.

CAS #

68648-89-5

Form

Liquid

State

Solid

See origin →

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

Traditional Use

A synthetic polymer developed in the late 20th century for use as a film-forming and conditioning agent in cosmetics and personal care products.

Skin Types

●all-skin-types

Best For

General

Pregnancy & Breastfeeding Safe

Yes

EWG

CIR

Safe as used

Pregnancy

Yes

Restricted By

CIR Safety Findings

all-shades-safe

Regulatory Status

USA✔ permitted

EU⚠ restricted

JAPAN⚠ restricted

CANADA⚠ restricted

Regulatory Agencies

Verified Jun 2026

Data: CosIng · EWG · CIR