Hydrogen Dimethicone/Octyl Silsesquioxane Copolymer
AKA “Silicone Copolymer, Hybrid Silicone”
Synthetic
Ingredient Facts
Hydrogen dimethicone/octyl silsesquioxane copolymer
AKA: Silicone Copolymer, Hybrid Silicone
Synthetic · Emollient · EWG: 4
Synthetic
Emollient
Occlusive
Skin Conditioner
Silicone
Synthetic
Clean
Science: Functions: Binding Safety Ratings: CIR: Safe as used
CAS #
-
Form
Liquid
State
Solid
See origin →
Functions
Skin Conditioning
A catch-all term for ingredients that improve how skin looks and feels — softer, smoother, more supple. The workhorse behind most moisturizers.
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.
Holds Formula Together
Brightens Skin
Antioxidant Protection
Reduces Inflammation
Holds ingredients together
Traditional Use
Created in the late 20th century as a modern silicone-based polymer for cosmetics. Designed to provide light, silky texture and water resistance in skincare and makeup formulations.
Skin Types
●all-skin-types
Best For
General
Melanin-Rich Skin
Suitable
Pregnancy & Breastfeeding Safe
Yes
EWG
4
CIR
Insufficient
Pregnancy
Yes
Restricted By
CIR Safety Findings
Not a Sensitizer
medical-approval
all-shades-safe
Regulatory Agencies
Verified Feb 2026
Data: CosIng · EWG · CIR