Methoxy PEG-13 Ethyl Polysilsesquioxane
molecular structure · PubChem
AKA: Silicone Polymer, Film Former
Synthetic
Humectant
Silicone
Not Clean
Methoxy PEG-13 Ethyl Polysilsesquioxane is a cosmetic ingredient used as humectant. Assessed as safe by the CIR.
CAS #
-
Form
Liquid
Functions
Humectant
A moisture magnet. Pulls water from the air and deeper skin layers up to the surface to keep skin plump and hydrated.
Locks In Moisture
Traditional Use
A synthetic silicone polymer developed for cosmetics in the late 20th century. Designed to improve product texture, spreadability, and to create a smooth, matte finish on skin.
EWG
4
CIR
Safe as used
Pregnancy
Yes
CIR Safety Findings
Not a Sensitizer
medical-approval
all-shades-safe
Regulatory Agencies
Skin Types
●all-skin-types
Best For
General
Pregnancy & Breastfeeding Safe
Yes
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.
Verified Jun 2026
Data: CosIng · EWG · CIR