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Isobutylene/Isoprene Copolymer
AKA “Butyl rubber, isoprene rubber copolymer”
Synthetic
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Ingredient Facts
Isobutylene/isoprene copolymer
AKA: Butyl rubber, Isoprene rubber copolymer
Synthetic · Viscosity Controlling | Film Forming | Skin Conditioning - Emollient | Smoothing · EWG: 4
Plant-Derived
Emollient
Occlusive
Skin Conditioner
Synthetic
Clean
Helps create a smooth, lightweight texture that feels comfortable on skin without feeling heavy or greasy.
CAS #
9010-85-9
Form
Liquid
Plant-Derived
Synthetic
Function
Viscosity Controlling | Film Forming | Skin Conditioning - Emollient | Smoothing
Benefits
Controls Viscosity
Traditional Use
Synthetic polymer developed in the mid-20th century as a film-forming agent in cosmetics. Used in skincare and color cosmetics to create a protective layer on the skin and improve product wear.
Skin Types
all-skin-types
Best For
Target
General
Melanin-Rich Skin
Suitable
Pregnancy Safe
Yes
EWG Score4
CIR Safety Findings
medical-approval, all-shades-safe, Not a Sensitizer
Regulatory Status
USA✔ permitted
EU⚠ restricted
JAPAN⚠ restricted
CANADA⚠ restricted
Verified Feb 2026
Data: CosIng · EWG · CIR