Aluminium hydroxide gel (Dried)

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.