What is Aluminum Stearate?
Aluminum stearate (aluminum distearate) is a white, wax-like powder that dissolves in mineral spirits or hot oil. It is commonly used in art supplies, particularly in oil paints, to impart a short, buttery consistency. A small amount (2% or less) added to oil paint eliminates the separation of pigment and oil, thickens varnishes considerably, and prevents settling.
Benefits of Using Aluminum Stearate
Aluminum stearate exhibits excellent properties that make it an ideal additive for oil paints. It has a synergistic effect with zinc stearate or calcium stearate, and its high solubility in hydrocarbon solvents allows for easy mixing with pigments. Additionally, it is insoluble in water, alcohol, and ether, making it an excellent choice for art supplies.
How to Use Aluminum Stearate
To use aluminum stearate, simply dissolve it in vegetable oils on heating, and then grind it with the pigment before adding the bulk of the oil. You can also prepare a concentrated solution by adding 100 grams of aluminum stearate to one liter of linseed oil and heating it to about 150°C. This solution can be stored for later use.
Properties of Aluminum Stearate
Aluminum stearate has a chemical formula of C36H71AlO5, a CAS No. of 300-92-5, and an EINECS of 206-101-8. It is composed of 4.7-5.3% aluminum, >93% aluminum stearate, and <7% free fatty acids (octadecanoic acid). Its typical physical properties include a melting point of 150-165°C, a specific gravity of 1.07, and a bulk density of 220-290 g/L.
Buy Aluminum Stearate Online
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