Aluminum Isostearate
AKA “Isooctadecanoic acid, aluminum salt, UNII-W0XTQ82Z4P, Aluminum isostearate [INCI], Isostearic acid, RefChem:111677, aluminum;16-methylheptadecanoate”
Synthetic
Ingredient Facts
Aluminum isostearate
AKA: Isooctadecanoic acid, Aluminum salt, UNII-W0XTQ82Z4P, Aluminum isostearate [INCI], Isostearic acid, RefChem:111677, Aluminum;16-methylheptadecanoate
Synthetic · Emulsion Stabilising · EWG: 4
Plant-Derived Synthetic
Emulsifier
Synthetic
Clean
Helps keep powder products smooth and prevents clumping, while creating an even, opaque finish that glides on effortlessly.
Formula
C54H105AlO6
Mol. Weight
877.40
CAS #
72277-75-9
Form
Wax
See origin →
Functions
Anticaking
Emulsion Stabilising
Forces oil and water to stay mixed instead of separating into layers. The unsung hero holding your lotion together.
Opacifying
Viscosity Controlling
Prevents Clumping
Stabilizes Emulsion
Adds Opacity
Controls Viscosity
Keeps product blended
Creates creamy opacity
Controls product thickness
Traditional Use
Synthetic aluminum salt developed in the 20th century as a thickening and emulsifying agent for cosmetics. Created to replace natural waxes and improve product stability in creams and ointments.
Skin Types
●all-skin-types
Best For
General
Melanin-Rich Skin
Suitable
Pregnancy & Breastfeeding Safe
Yes
Final Report on the Safety Assessment of Isostearic Acid
Cosmetic Ingredient Review (CIR) Expert Panel
International Journal of Toxicology
Aluminum Isostearate
European Commission
EU Cosmetic Ingredient Database (CosIng)
Aluminum Isostearates/Laurates/Palmitates
European Commission
EU Cosmetic Ingredient Database (CosIng)
Aluminum Isostearates/Laurates/Stearates
European Commission
EU Cosmetic Ingredient Database (CosIng)
Aluminum Isostearates/Myristates
European Commission
EU Cosmetic Ingredient Database (CosIng)
Aluminum Isostearates/Palmitates
European Commission
EU Cosmetic Ingredient Database (CosIng)
Aluminum Isostearates/Stearates
European Commission
EU Cosmetic Ingredient Database (CosIng)
Isostearic Acid
Environmental Working Group (EWG)
EWG Skin Deep Cosmetics Database
Microemulsions based on TPGS and isostearic acid for imiquimod formulation and skin delivery.
Pescina S, Garrastazu G, Del Favero E, Rondelli V, Cantù L et al.
European journal of pharmaceutical sciences : official journal of the European Federation for Pharmaceutical Sciences, 2018
Verified Feb 2026
Data: PubChem · CosIng · EWG · CIR