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Polycaprylylsilsesquioxane
AKA “Silicone Resin, Silsesquioxane”
Ingredient
Ingredient Facts
Polycaprylylsilsesquioxane
AKA: Silicone Resin
Ingredient · Not Reported · EWG: 4
Synthetic
Silicone
Plant Oil
Not Clean
Polycaprylylsilsesquioxane
CAS #
-
Form
Liquid
See origin →
Functions
Not Reported
Provides lightweight silky texture
Creates smooth skin feel
Helps product spread evenly
Traditional Use
Developed as a modern silicone polymer in the late 20th century. Used in cosmetics as a silky texture enhancer and absorbent powder that reduces shine and improves product feel on skin.
Skin Types
●all-skin-types
Best For
General
Pregnancy & Breastfeeding Safe
Yes
EWG
4
CIR
Safe as used
Pregnancy
Yes
CIR Safety Findings
Not a Sensitizer
medical-approval
all-shades-safe
Regulatory Status
USA✔ permitted
EU⚠ restricted
JAPAN⚠ restricted
CANADA⚠ restricted
Final Report: Safety Assessment of Polysilsesquioxanes as Used in Cosmetics
Cosmetic Ingredient Review (CIR) Expert Panel
International Journal of Toxicology
→
C26-28 Alkyldimethylsilyl Polypropylsilsesquioxane
European Commission
EU Cosmetic Ingredient Database (CosIng)
→
C30-45 Alkyldimethylsilyl Polypropylsilsesquioxane
European Commission
EU Cosmetic Ingredient Database (CosIng)
→
Dimethicone/Bis-Vinyldimethicone/Silsesquioxane Crosspolymer
European Commission
EU Cosmetic Ingredient Database (CosIng)
→
Dimethicone/Divinyldimethicone/Silsesquioxane Crosspolymer
European Commission
EU Cosmetic Ingredient Database (CosIng)
→
Dimethicone/Silsesquioxane Copolymer
European Commission
EU Cosmetic Ingredient Database (CosIng)
→
Dimethiconol/Silsesquioxane Copolymer
European Commission
EU Cosmetic Ingredient Database (CosIng)
→
Diphenyl Dimethicone/Vinyl Diphenyl Dimethicone/Silsesquioxane Crosspolymer
European Commission
EU Cosmetic Ingredient Database (CosIng)
→
Ethyl Polysilsesquioxane
European Commission
EU Cosmetic Ingredient Database (CosIng)
→
Hydrogen Dimethicone/Octyl Silsesquioxane Copolymer
European Commission
EU Cosmetic Ingredient Database (CosIng)
→
Isobutyl Polysilsesquioxane
European Commission
EU Cosmetic Ingredient Database (CosIng)
→
Methacryloyloxypropyl Polysilsesquioxane
European Commission
EU Cosmetic Ingredient Database (CosIng)
→
Methoxy PEG-13 Ethyl Polysilsesquioxane
European Commission
EU Cosmetic Ingredient Database (CosIng)
→
Polycaprylylsilsesquioxane
European Commission
EU Cosmetic Ingredient Database (CosIng)
→
Polydimethylsiloxy PEG/PPG-24/19 Butyl Ether Silsesquioxane
European Commission
EU Cosmetic Ingredient Database (CosIng)
→
Polydimethylsiloxy PPG-13 Butyl Ether Silsesquioxane
European Commission
EU Cosmetic Ingredient Database (CosIng)
→
Polymethylsilsesquioxane
European Commission
EU Cosmetic Ingredient Database (CosIng)
→
Polymethylsilsesquioxane/Trimethylsiloxysilicate
European Commission
EU Cosmetic Ingredient Database (CosIng)
→
Polypropylsilsesquioxane
European Commission
EU Cosmetic Ingredient Database (CosIng)
→
Trifluoropropyl Dimethicone/Vinyl Trifluoropropyl Dimethicone/Silsesquioxane Crosspolymer
European Commission
EU Cosmetic Ingredient Database (CosIng)
→
Vinyl Dimethicone/Methicone Silsesquioxane Crosspolymer
European Commission
EU Cosmetic Ingredient Database (CosIng)
→
Dimethicone/Divinyldimethicone/Silsesquioxane Crosspolymer
Environmental Working Group (EWG)
EWG Skin Deep Cosmetics Database
→
Dimethicone/Silsesquioxane Copolymer
Environmental Working Group (EWG)
EWG Skin Deep Cosmetics Database
→
Dimethiconol/Silsesquioxane Copolymer
Environmental Working Group (EWG)
EWG Skin Deep Cosmetics Database
→
Diphenyl Dimethicone/Vinyl Diphenyl Dimethicone/Silsesquioxane Crosspolymer
Environmental Working Group (EWG)
EWG Skin Deep Cosmetics Database
→
Polymethylsilsesquioxane
Environmental Working Group (EWG)
EWG Skin Deep Cosmetics Database
→
Polypropylsilsesquioxane
Environmental Working Group (EWG)
EWG Skin Deep Cosmetics Database
→
Vinyl Dimethicone/Methicone Silsesquioxane Crosspolymer
Environmental Working Group (EWG)
EWG Skin Deep Cosmetics Database
→
Evolution of Methylsilsesquioxane: From Hydrolytic Polycondensation Product to Xerogel.
Meshkov IB, Mazhorova NG, Bakirov AV, Vasil'ev SG, Kalinina AA et al.
Polymers, 2025
→
Verified Jun 2026
Data: CosIng · EWG · CIR