Description: A white, pasty material; small amounts of clear liquid may separate on standing.
Solubility: Insoluble in water and in ethanol (95%). It dissolves in dilute mineral acids and in excess of caustic alkali solutions.


Gelatinous white precipitate should re-appear.
An intense purple colour should be formed.
A reddish violet colour should be formed.

pH: Between 8.5 and 10.0

Arsenic: Not more than 1ppm.
Heavy Metals: Not more than 10 ppm
Chloride: Not more than 0.25%
Microbial contamination; Total viable aerobic count, not more than 100 micro-organisms
per ml. 1 g should be free from Escherichia coli

  • Formula: Al(OH)3
  • Molar mass: 78.0036 g/mol
  • Density: 2.42 g/cm³
  • Melting point: 300 °C
  • Soluble in: Acid, Sulfuric acid, Alkali, Hydrochloric acid