murphyPolymethylsilsesquioxane/Trimethylsiloxysilicate
molecular structure · PubChem
AKA: Silicone Resin, Silicone Elastomer
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Synthetic
Not Clean
OriginDerived from siloxane polymers, a class of synthetic silicon-oxygen compounds with organic methyl groups attached. Synthesized through condensation reactions of methylsiloxane monomers, forming a crosslinked silicone polymer network.
Polymethylsilsesquioxane/Trimethylsiloxysilicate is the product of the reaction of Polymethylsilsesquioxane and Trimethylsiloxysilicate
CAS #
-
Form
Powder
Skin Types
●all-skin-types
Best For
General
Pregnancy & Breastfeeding Safe
Yes
Functions
Not Reported
Creates silky smooth texture
Provides lightweight skin feel
Helps improve product spreadability
The paper trail
🔬Peer-reviewednone on file
⚖️Regulatory1 listing →
🛡️Safety-assessed1 review →
Counts, not a verdict. A listing isn't a study. The trail, you decide.
EWG
4
CIR
Safe as used
Pregnancy
Yes
CIR Safety Findings
Not a Sensitizer
1 study / 1 not sensitizing (CIR 743)
Concentration Guide
CIR lists it as not reported to be in use.
CIR · report published 2017
Regulatory Agencies
Verified Jun 2026
Data: CosIng · EWG · CIR