Description
Dried aluminium hydroxide gel is a white, odorless, amorphous powder form of aluminium hydroxide (
Al(OH)
3
Al(OH)
3
), primarily used as an antacid in pharmaceutical preparations and as an adsorbent, flame retardant, and catalyst carrier in industrial applications.
Chemical Properties and Composition
Formula:
Al(OH)
3
Al(OH)
3
(sometimes referred to as aluminium oxide hydrate in this context).
Physical form: Fine, white amorphous powder with high adsorptive and neutralizing capacity.
Assay: The Al₂O₃ content typically ranges between 47–60% in dried gel; the product is non-irritant, non-radioactive, and suitable for vegetarians and vegans.
Melting Point: Around 300°C.
Solubility: Insoluble in water but soluble in acids and alkalis.
pH: Not more than 10 in aqueous suspension.
Uses
Pharmaceutical Antacid: Most commonly formulated to treat symptoms of excess stomach acid, heartburn, sour stomach, acid indigestion, and to lower phosphate levels in some kidney conditions.
Colorant and Inks: Used in the manufacture of lake pigments and as a carrier in inks.
Catalyst Support: Serves as a carrier/support in certain chemical catalysts due to its adsorptive properties.
Adsorbent and Flame Retardant: Functions widely as an adsorbent and as a fire retardant additive in polymers.
Water Treatment: Sometimes used as an adsorbent in water purification processes.
Technical Notes
Dried gels are stable, retain their acid neutralizing capacity over time, and display excellent workability and storability.
The pharmaceutical/USP grade must be free from heavy metals, microbial contamination, and allergens.
Expiry is usually five years from manufacture and storage should be protected from moisture.
Dried aluminium hydroxide gel is especially valued for its safety, antacid function, and versatile adsorptive applications in both health and industrial sectors.