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Trimethylsiloxysilicate
AKA “RefChem:899896, 641-015-8, 923-739-9, SCHEMBL347192”
Emollient
Ingredient Facts
Trimethylsiloxysilicate
AKA: RefChem:899896, 641-015-8, 923-739-9, SCHEMBL347192
Emollient · Emollient · EWG: 1
Synthetic
Emollient
Skin Conditioner
Silicone
Clean
Silica, reaction products with trimethylsilane
Formula
C6H18O5Si3
Mol. Weight
254.46
CAS #
68611-44-9; 1015787-46-8; 211811-62-0; 68909-20-6; 112153-70-5; 112153-71-6; 1123693-37-7; 70536-25-3; 371755-66-7; 1158846-14-0
Form
Powder
See origin →
Functions
Antifoaming
Skin Conditioning
A catch-all term for ingredients that improve how skin looks and feels — softer, smoother, more supple. The workhorse behind most moisturizers.
Emollient
Fills in the tiny cracks between skin cells to make everything feel smooth and soft. The "silky finish" ingredient.
Locks In Moisture
Traditional Use
Developed as a silicone-based polymer in the late 20th century. Used in cosmetics as a mattifying agent and skin-feel enhancer, particularly in powders, foundations, and silicone-based skincare products.
Skin Types
●all-skin-types, gentle
Best For
General
Pregnancy & Breastfeeding Safe
Yes
EWG
1
CIR
Safe as used
Pregnancy
Yes
CIR Safety Findings
ewg-1
medical-approval
pregnancy-nursing-safe
all-shades-safe
Potential Sensitizer
Regulatory Status
USA✔ permitted
EU⚠ restricted
JAPAN⚠ restricted
CANADA⚠ restricted
Dimethicone/Vinyltrimethylsiloxysilicate Crosspolymer
European Commission
EU Cosmetic Ingredient Database (CosIng)
→
Polymethylsilsesquioxane/Trimethylsiloxysilicate
European Commission
EU Cosmetic Ingredient Database (CosIng)
→
Trifluoropropyldimethyl/trimethylsiloxysilicate
European Commission
EU Cosmetic Ingredient Database (CosIng)
→
Trimethylsiloxysilicate
European Commission
EU Cosmetic Ingredient Database (CosIng)
→
Trimethylsiloxysilicate/Dimethicone Crosspolymer
European Commission
EU Cosmetic Ingredient Database (CosIng)
→
Trimethylsiloxysilicate/Dimethiconol Crosspolymer
European Commission
EU Cosmetic Ingredient Database (CosIng)
→
Vinyldimethyl/Trimethylsiloxysilicate Stearyl Dimethicone Crosspolymer
European Commission
EU Cosmetic Ingredient Database (CosIng)
→
Vinyldimethyl/Trimethylsiloxysilicate/Dimethicone Crosspolymer
European Commission
EU Cosmetic Ingredient Database (CosIng)
→
Dimethicone/Vinyltrimethylsiloxysilicate Crosspolymer
Environmental Working Group (EWG)
EWG Skin Deep Cosmetics Database
→
Trifluoropropyldimethyl/trimethylsiloxysilicate
Environmental Working Group (EWG)
EWG Skin Deep Cosmetics Database
→
Trimethylsiloxysilicate
Environmental Working Group (EWG)
EWG Skin Deep Cosmetics Database
→
Trimethylsiloxysilicate/Dimethicone Crosspolymer
Environmental Working Group (EWG)
EWG Skin Deep Cosmetics Database
→
Trimethylsiloxysilicate/Dimethiconol Crosspolymer
Environmental Working Group (EWG)
EWG Skin Deep Cosmetics Database
→
Verified Jun 2026
Data: PubChem · CosIng · EWG · CIR