Description
Aluminium phosphate extra pure refers to a highly refined grade of aluminium phosphate (
AlPO
4
AlPO
4
), a white, odorless, crystalline or amorphous powder widely used in laboratory, industrial, and pharmaceutical settings for its purity and consistent performance.
Chemical Properties and Composition
Chemical Formula:
AlPO
4
AlPO
4
.
Molecular Weight: 121.95 g/mol.
Appearance: White crystalline or amorphous powder; odorless.
Density: ~2.56 g/cm³.
Melting Point: ~1,800°C (decomposes before boiling).
Solubility: Insoluble in water; slightly soluble in acids like HCl and HNO₃.
Purity (extra pure): Typically ≥98%, with very low levels of trace impurities.
Applications
Laboratory Reagent: Used for analytical and research purposes in preparation of standards and chemical synthesis.
Pharmaceuticals: Acts as an antacid, is used in dental cements, and as a vaccine adjuvant.
Ceramics and Glass: Important as a binder, cement, and flux in advanced ceramics, refractories, and glass production.
Food and Cosmetics: Used as a food additive for leavening and in cosmetics as an emulsifier and stabilizer.
Water Treatment: Functions as a coagulant in purification processes.
Technical Notes
Structure: Similar to quartz (
SiO
2
SiO
2
), with trigonal or framework crystalline forms in the anhydrous state; may also occur in hydrated forms such as pentahydrate and dihydrate (
AlPO
4
⋅
2
H
2
O
AlPO
4
⋅2H
2
O,
AlPO
4
⋅
5
H
2
O
AlPO
4
⋅5H
2
O).
Health & Safety: Non-flammable but can irritate eyes, skin, and respiratory tract at high concentrations.
Typical Assay: Purity certified by trace analysis of iron, heavy metals, chloride, sulfate, and other contaminants.
Extra pure aluminium phosphate is chosen for sensitive chemical and pharmaceutical processes, where trace contamination must be minimized and standard specifications met.