PEG-Cetyl Stearyl Diether
molecular structure · PubChem
AKA: PEGylated Fatty Alcohol Ether
Plant-Derived
Emollient
Emulsifier
Plant Oil
Not Clean
PEG-Cetyl Stearyl Diether is a cosmetic ingredient. Assessed as safe by the CIR.
CAS #
9002-92-0; 68439-50-9; 5274-68-0; 9004-95-9; 9005-00-9; 4536-30-5; 3055-93-4; 3055-94-5; 3055-95-6
Functions
Emollient
Fills in the tiny cracks between skin cells to make everything feel smooth and soft. The "silky finish" ingredient.
Emulsifying
Forces oil and water to stay mixed instead of separating into layers. The unsung hero holding your lotion together.
Traditional Use
A synthetic ether compound created in the 20th century by combining polyethylene glycol with fatty alcohols. Developed as an emulsifier and conditioning agent for cosmetics with no traditional precedent.
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
⚖️Regulatory0 listings
🛡️Safety-assessed1 review →
Counts, not a verdict. A listing isn't a study. The trail, you decide.
Verified Jun 2026
Data: CosIng · EWG · CIR