Cetyl PEG-8 Dimethicone
AKA “FCDZUBQKZKFAET-UHFFFAOYSA-N”
Synthetic
Ingredient Facts
Cetyl peg-8 dimethicone
AKA: FCDZUBQKZKFAET-UHFFFAOYSA-N
Synthetic · Emollient · EWG: 4
Synthetic
Emollient
Cleanser
Emulsifier
Skin Conditioner
Silicone
Synthetic
Clean
Siloxanes and silicones, dimethyl, hexadecyl methyl, 3-(hydropoly(oxyethanediyl)oxy)propyl methyl (8 mol EO average), trimethylsilyl terminated Science: Functions: Surfactant - Emulsifying Safety Ratings: CIR: Safe as used
Formula
C26H62O5Si4
Mol. Weight
567.1
CAS #
-
Form
Liquid
See origin →
Functions
Emulsifying
Forces oil and water to stay mixed instead of separating into layers. The unsung hero holding your lotion together.
Skin Conditioning
A catch-all term for ingredients that improve how skin looks and feels — softer, smoother, more supple. The workhorse behind most moisturizers.
Emollient
Fills in the tiny cracks between skin cells to make everything feel smooth and soft. The "silky finish" ingredient.
Surfactant Emulsifying
Anti-Inflammatory
Moisturizing
Locks in moisture to keep skin soft and supple throughout the day
Boosts Collagen
Mixes oil and water
Traditional Use
A synthetic silicone emulsifier developed in the mid-to-late 20th century for use in cosmetics. Designed to improve the spreadability and sensory profile of skincare products.
Skin Types
●all-skin-types
Best For
Dryness
Melanin-Rich Skin
Suitable
Pregnancy & Breastfeeding Safe
Yes
EWG
4
CIR
Insufficient
Pregnancy
Yes
CIR Safety Findings
Not a Sensitizer
medical-approval
all-shades-safe
Regulatory Agencies
Verified Feb 2026
Data: PubChem · CosIng · EWG · CIR