Polyisoprene
AKA “Natural rubber, cis-polyisoprene, rubber”
Synthetic
Ingredient Facts
Polyisoprene
AKA: Natural rubber, Cis-polyisoprene, Rubber
Synthetic · Emollient · EWG: 4
Synthetic
Emollient
Occlusive
Skin Conditioner
Synthetic
Clean
A texture-smoothing agent that creates a light, even consistency in formulas so products apply seamlessly without feeling thick or sticky.
CAS #
9003-31-0
Form
Powder
See origin →
Functions
Viscosity Controlling
Film Forming
Creates a physical seal on skin to lock moisture in and keep irritants out. The "slugging" ingredient — barrier protection.
Emollient
Fills in the tiny cracks between skin cells to make everything feel smooth and soft. The "silky finish" ingredient.
Smoothing
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
Melanin-Rich Skin
Suitable
Pregnancy & Breastfeeding Safe
Yes
Verified Feb 2026
Data: CosIng · EWG · CIR