Sodium hexametaphosphate
| Formula | (NaPO3)n |
| Chemical formula | (NaPO3)nn |
| CAS number | 10361-03-2 |
| HS Code | 28353900 |
| EC number | 233-782-9 |
| Storage | Without limitation |
| SDS | available |
| Odour | odourless |
| Form | solid |
| Color | white |
| p H value | ~5.7(10 g/l 20°C) |
| Solubility in water | ~1000 g/l (20°C) |
| Melting point | ~550 °C |
| Vapour pressure | low(20°C) |
| Assay | ≥ | 68 | % |
| Description | Conforms | ||
| Solubility | Conforms | ||
| Identification | Conforms | ||
| Heavy metals | ≤ | 0.005 | % |
| Chloride | ≤ | 0/02 | % |
| Iron | ≤ | 0/01 | % |
| Loss on ignition | ≤ | 1 | % |
| Insoluble substances | ≤ | 0/1 | % |
Sodium Hexametaphosphate is an inorganic polymeric compound with the chemical formula (NaPO₃)₆. It is widely used in pharmaceutical and laboratory applications as a dispersing agent, chelating agent, and stabilizer.
🏭⚗️ Production
Sodium hexametaphosphate is produced by heating monosodium phosphate at high temperatures, resulting in a glassy, amorphous product. The polymerized material is then cooled, ground, and purified to obtain a fine, white powder suitable for pharmaceutical and laboratory use.
🔬 Properties
Sodium hexametaphosphate is a white, odorless, and hygroscopic powder. It is highly soluble in water and forms complexes with metal ions such as calcium and magnesium. The compound is chemically stable, slightly alkaline in aqueous solution, and functions effectively as a chelating and dispersing agent in various formulations.
🧪 Applications
In pharmaceutical formulations, sodium hexametaphosphate is used as a stabilizer to prevent precipitation of metal ions, as a chelating agent to bind unwanted metal ions, and as a dispersing agent in suspensions and emulsions. In laboratory settings, it is employed to soften water, maintain particle dispersion in analytical procedures, and serve as a component in buffer systems and other chemical preparations.
⚠️ Safety
Sodium hexametaphosphate is generally recognized as safe for pharmaceutical and laboratory use. Direct contact with skin or eyes should be avoided. Personal protective equipment, including gloves and goggles, should be worn when handling. It should be stored in a cool, dry place in tightly sealed containers to maintain purity and quality.
