Sodium Stearyl Fumarate
AKA “Sodium monostearyl fumarate, SODIUM OCTADECYL FUMARATE, RefChem:184103, DTXCID001506817, Sodium 2-octadecylfumarate”
Synthetic
Ingredient Facts
Sodium stearyl fumarate
AKA: Sodium monostearyl fumarate, SODIUM OCTADECYL FUMARATE, RefChem:184103, DTXCID001506817, Sodium 2-octadecylfumarate
Synthetic · Emollient · EWG: 4
Plant-Derived
Emollient
Skin Conditioner
Synthetic
Clean
A natural bulking agent derived from plants that helps create a smooth, even texture in beauty products.
Formula
C22H39NaO4
Mol. Weight
390.50
CAS #
4070-80-8
Form
Powder
See origin →
Functions
Bulking
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.
Anti-Inflammatory
Antimicrobial
Fights Acne
Adds volume
Traditional Use
Synthetic conditioning agent created in the mid-20th century by combining stearic acid with fumaric acid. Developed to improve texture and conditioning properties in skincare and cosmetic formulations.
Skin Types
●all-skin-types
Best For
General
Melanin-Rich Skin
Suitable
Pregnancy & Breastfeeding Safe
Yes
Verified Feb 2026
Data: PubChem · CosIng · EWG · CIR