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Hydrogenated Styrene
AKA “Hydrogenated Polystyrene, Hydrogenated Styrene Polymer”
Synthetic
Ingredient Facts
Hydrogenated styrene
AKA: Hydrogenated Polystyrene, Hydrogenated Styrene Polymer
Synthetic · Emollient · EWG: 1
Synthetic
Emollient
Occlusive
Skin Conditioner
Synthetic
Clean
Helps create a smooth, even texture in formulas while maintaining the right consistency for easy application.
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
Emollient
Fills in the tiny cracks between skin cells to make everything feel smooth and soft. The "silky finish" ingredient.
Smoothing
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
Melanin-Rich Skin
Suitable
Pregnancy & Breastfeeding Safe
Yes
EWG
1
CIR
Safe w/Qualifications
Pregnancy
Yes
CIR Safety Findings
ewg-1
pregnancy-nursing-safe
all-shades-safe
Regulatory Status
USA✔ permitted
EU⚠ restricted
JAPAN⚠ restricted
CANADA⚠ restricted
Verified Feb 2026
Data: CosIng · EWG · CIR