Polyisoprene

Polyisoprene

AKA “Natural rubber, cis-polyisoprene, rubber”

Ingredient

Ingredient Facts

Polyisoprene

AKA: Natural rubber, Cis-polyisoprene, Rubber

Ingredient · Viscosity Controlling · EWG: 1

Synthetic

Clean

Homopolymer of 2-methyl-1,3-butadiene

CAS #

9003-31-0

Form

Powder

See origin →

Functions

Viscosity Controlling

Controls Viscosity

Traditional Use

Synthesized in the early 20th century as an artificial rubber. Applied to cosmetics as a film-former and emollient, replacing natural rubber latex in formulations.

Skin Types

●all-skin-types

Best For

General

Pregnancy & Breastfeeding Safe

Yes

EWG

CIR

Safe as used

Pregnancy

Yes

CIR Safety Findings

Not a Sensitizer

medical-approval

all-shades-safe

Regulatory Status

USA✔ permitted

EU⚠ restricted

JAPAN⚠ restricted

CANADA⚠ restricted

Regulatory Agencies

EWG CIR FDA EU COSING Health Canada

Polyisoprene

European Commission

EU Cosmetic Ingredient Database (CosIng)

→

Polyisoprene

Environmental Working Group (EWG)

EWG Skin Deep Cosmetics Database

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Verified Jun 2026

Data: CosIng · EWG · CIR