PEG-Cetyl Stearyl Diether
AKA “PEGylated Fatty Alcohol Ether
Ingredient
Ingredient Facts
Peg-cetyl stearyl diether
AKA: PEGylated Fatty Alcohol Ether
Ingredient · Emollient · EWG: 4
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
See origin →
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.
Skin Types
all-skin-types
Best For
General
Pregnancy & Breastfeeding Safe
Yes
EWG
4
CIR
Safe as used
Pregnancy
Yes
CIR Safety Findings
Not a Sensitizer
medical-approval
all-shades-safe
Regulatory Status
USApermitted
EUrestricted
JAPANrestricted
CANADArestricted
Verified Jun 2026
Data: CosIng · EWG · CIR