ALUMINUM STEARATE

PRODUCT IDENTIFICATION

TOXICITY

SMILES

CLASSIFICATION

EXTRA NOTES

PHYSICAL AND CHEMICAL PROPERTIES

white powder

145 C (Distearate), 118 C (Tristearate)

Insoluble

Insoluble in alcohol, ether; soluble in alkali, BTX, glycol, chlorinated hydrocarbons, mineral and vegetable oils

REFRACTIVE INDEX

EXTERNAL LINKS & GENERAL DESCRIPTION

Wikipedia Linking

Material Safety Data Sheet

Google Scholar Search

http://www.doiserbia.nb.rs/
Aluminum soaps have different and widespread applications (1-4), aluminum stearates being among them especially important. Aluminum tristearate is useful in paints and enamels and in the flatting of varnishes. It also prevents bleeding and oil separation in putty. Aluminum distearate is the most commonly used grade of aluminum stearate. It is used as a thickener in paints, inks and greases; a water repellent for leather and rope; and a lubricant in plastics and rope. It is also used in cement production for waterproofing and air entrainment, and in hot-melt paper coating compounds. Because of its unusually heavy bodying properties, aluminum monostearate is used in the manufacture of paints, inks, greases, and waxes (3). In recent years (5), hydrophobic aluminum monostearate was tested as a low-solubility denitrification substrate for anaerobic bacteria and a source of aluminum for phosphate precipitation. Aluminum stearate has potential for use in a flow-through container for denitrification of oxidized effluent from home sewage systems. It was also referred that the preheated mixture of metal soaps, along with the costabilizer, delayed the fast blackening of the polymer, but mainly showed a reduction

Local:  
GENERAL DESCRIPTION OF METALLIC SALTS OF FATTY ACIDS: Metallic salts of fatty acids (called soap) are primarily used as cleansing agent (mainly sodium- and potassium-) which their molecules attach readily to both polar molecules (of water) and non-polar molecules (of grease or oil). The long hydrocarbon chains are non-polar (and hydrophobic) repelled by water and the salt end molecules are ionic (and hydrophilic) water soluble. Soaps differ according to the type of fatty acid and length of the carbon chain and according to the alkali employed. Fatty acids with longer chains are insoluble. If sodium hydroxide is used as the alkali, hard soaps are formed; potassium hydroxide yields soft soaps. Soap salts are used as insecticides, herbicides, fungicides and algaecides. The lipophilic carbon chains infiltrate and destroy the lipoprotein matrix of the insect's cell membranes. Food grade soap salts are used also as  general purpose food additives. Aluminum, calcium, magnesium, lead, zinc or other metals are used in place of sodium or potassium for soaps to be used in industry. Metallic salts of fatty acids are used as stabilizer and plasticizer in plastic industry as well as in cosmetics. They are used as flatting and sanding agents in lacquers, coatings & inks. They can be applied in tablet manufacturing. They are used as drying lubricants and dusting agents for rubbers. They are used as catalysts in chemical synthesis and emulsifiers for emulsion polymerization of synthetic rubber and resin which can be approved for use in food contact applications. They are used as waterproofing additives and ointments. 
APPLICATIONS: Aluminium Stearate is used as a lubricant in the production of polyamides and thermosetting plastics. It is used as a thickening agent in the production of varnishes and lacquers. It is also used as a water repellent agent and hydrophobic agent.

DISTEARATE

APPEARANCE

White Powder

Al₂O₃ CONTENT

12.0 ± 1.5ге

MELTING POINT

150 - 170 C

8.0% min

1.0% max ( 200 mesh)

3.0% max

TRISTEARATE

APPEARANCE

White Powder

Al₂O₃ CONTENT

10.0 ± 1.0ге

MELTING POINT

150 C min

3.0% max

4.0% max

1.0% max ( 200 mesh)