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Polyisoprene
AKA “Natural rubber, cis-polyisoprene, rubber”
Ingredient
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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
1
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
Verified Jun 2026
Data: CosIng · EWG · CIR