Hydrogenated Styrene/Butadiene Copolymer
AKA “Synthetic Polymer”
Ingredient
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Ingredient Facts
Hydrogenated styrene/butadiene copolymer
AKA: Synthetic Polymer
Ingredient · Film Forming · EWG: 1
Synthetic
Occlusive
Clean
Ethenylbenzene, polymer with 1,3-butadiene, hydrogenated
CAS #
66070-58-4
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
Creates Protective Barrier
Controls Viscosity
Anti-Aging Benefits
Antioxidant Protection
Reduces Inflammation
Creates protective layer
Controls product thickness
Traditional Use
This is a synthetic polymer developed in the mid-20th century as part of modern polymer chemistry. It is used in cosmetics as a film-former and texture modifier, with no historical or traditional use.
Skin Types
●all-skin-types
Best For
General
Pregnancy & Breastfeeding Safe
Yes
EWG
1
CIR
Safe as used
Pregnancy
Yes
Restricted By
CIR Safety Findings
medical-approval
all-shades-safe
Regulatory Agencies
Verified Jun 2026
Data: CosIng · EWG · CIR