Aluminum Stearate
molecular structure · PubChem
AKA: Aluminum stearate 300, Dibasic aluminium stearate, Aluminium, Dihydroxide stearate, ALUMINUM MONOPALMITOSTEARATE, (octadecanoyloxy)alumanylidene dihydrate
Plant-Derived
Colorant
Emulsifier
Plant Oil
Clean
Aluminium monostearate is a salt of stearic acid and aluminium with the molecular formula Al(OH)2C18H35O2. Also known as dihydroxyaluminium or dihydroxy(stearato)aluminium, it is used to form gels in the packaging of pharmaceuticals and in the preparation of colors for cosmetics. While considered safe for use, extensive usage may result in aluminum accumulation.
Formula
C18H37AlO4
Mol. Weight
344.50
CAS #
7047-84-9
Form
Wax
Functions
Anticaking
Colorant
Gives the product its color. Purely aesthetic — makes the formula look good in the jar but does nothing for your skin.
Emulsion Stabilising
Forces oil and water to stay mixed instead of separating into layers. The unsung hero holding your lotion together.
Viscosity Controlling
Prevents Clumping
Adds Color
Stabilizes Emulsion
Controls Viscosity
Keeps Formula Blended
Traditional Use
Synthetic aluminum salt developed in the 20th century as a thickening and suspending agent for cosmetics. Created to replace soap-based thickeners with more stable formulations.
EWG
1
CIR
Safe as used
Pregnancy
Yes
CIR Safety Findings
Not a Sensitizer
ewg-1
medical-approval
pregnancy-nursing-safe
all-shades-safe
Concentration Guide
14%
0%20%
Reg. Limit
SCCS maximum safe concentration: 14%. Product type: cosmetic products. Source: SCCS Opinion SCCS/1626/20.
Regulatory Agencies
Skin Types
●all-skin-types, gentle
Best For
General
Pregnancy & Breastfeeding Safe
Yes
The paper trail
🔬Peer-reviewednone on file
⚖️Regulatory1 listing →
🛡️Safety-assessed2 reviews →
Counts, not a verdict. A listing isn't a study. The trail, you decide.
Verified Jun 2026
Data: PubChem · CosIng · EWG · CIR