murphyMethoxy PEG-10 Polysilsesquioxane
molecular structure · PubChem
AKA: Silicone Polymer, Film Former
Synthetic
Humectant
Cleanser
Solvent
Skin Conditioner
Not Clean
OriginDerived from silicone and polyethylene glycol (PEG) chemical families through synthetic polymer chemistry. Synthesized by condensation reaction of silsesquioxane with methoxy-terminated polyethylene glycol under controlled conditions.
Poly(oxy-1,2-ethanediyl), \a-methyl-\q-[3-(trimethoxysilyl)propoxy]-, hydrolyzed
CAS #
1838163-04-4
Form
Liquid
Skin Types
●all-skin-types
Best For
General
Pregnancy & Breastfeeding Safe
Yes
Functions
Cleansing
Makes oil and water mix so dirt, makeup, and sunscreen can actually be washed away. The reason your face wash foams.
Humectant
A moisture magnet. Pulls water from the air and deeper skin layers up to the surface to keep skin plump and hydrated.
Skin Conditioning
A catch-all term for ingredients that improve how skin looks and feels — softer, smoother, more supple. The workhorse behind most moisturizers.
Solvent
Dissolves other ingredients so they distribute evenly in the formula. Often the invisible "base" everything else is mixed into.
Cleansing
Makes oil and water mix so dirt, makeup, and sunscreen can actually be washed away. The reason your face wash foams.
Locks In Moisture
The paper trail
🔬Peer-reviewednone on file
⚖️Regulatory0 listings
🛡️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
Skin Irritant in Testing
1 study / 1 irritating (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