Hydrogenated Styrene
AKA “Hydrogenated Polystyrene, Hydrogenated Styrene Polymer”
Ingredient
Ingredient Facts
Hydrogenated styrene
AKA: Hydrogenated Polystyrene, Hydrogenated Styrene Polymer
Ingredient · Film Forming · EWG: 1
Synthetic
Occlusive
Clean
Ethenylbenzene, polymer with 1,3-butadiene, hydrogenated
CAS #
66070-58-4
Form
Powder
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
A synthetic polymer developed in mid-20th century cosmetic chemistry as a film-forming and texture-enhancing agent. Created to provide better spreadability and stability in cosmetic formulations without natural alternatives.
Skin Types
●all-skin-types, gentle
Best For
General
Pregnancy & Breastfeeding Safe
Yes
EWG
1
CIR
Safe w/Qualifications
Pregnancy
Yes
Restricted By
CIR Safety Findings
ewg-1
pregnancy-nursing-safe
all-shades-safe
Regulatory Agencies
Hydrogenated Styrene/Butadiene Copolymer
European Commission
EU Cosmetic Ingredient Database (CosIng)
Hydrogenated Styrene/Isoprene Copolymer
European Commission
EU Cosmetic Ingredient Database (CosIng)
Hydrogenated Styrene
Environmental Working Group (EWG)
EWG Skin Deep Cosmetics Database
Hydrogenated Styrene Isoprene Copolymer
Environmental Working Group (EWG)
EWG Skin Deep Cosmetics Database
Hydrogenated Styrene/Butadiene Copolymer
Environmental Working Group (EWG)
EWG Skin Deep Cosmetics Database
Hydrogenated Styrene/Isoprene Copolymer
Environmental Working Group (EWG)
EWG Skin Deep Cosmetics Database
Verified Jun 2026
Data: CosIng · EWG · CIR