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SODIUM HEXAMETAPHOSPHATE

Sodium Hexametaphosphate
Molecular Formula: Na6P6O18
HS Code:28352940

Description

Sodium hexametaphosphate (SHMP) is a hexamer of composition (NaPO3)6. Sodium hexametaphosphate of commerce is typically a mixture of polymeric metaphosphates, of which the hexamer is one, and is usually the compound referred to by this name. It is more correctly termed sodium polymetaphosphate.

Properties

Chemical formula: Na6P6O18
Molar mass: 611.7704 g mol−1
Appearance: White crystals
Odor: odorless
Density: 2.484 g/cm3
Melting point: 628 °C (1,162 °F; 901 K)
Boiling point: 1,500 °C (2,730 °F; 1,770 K)
Solubility in water: soluble
Solubility: insoluble in organic solvents
Refractive index : 1.482

Uses

SHMP is used as a sequestrant and has applications within a wide variety of industries, including as a food additive in which it is used under the E number E452i. Sodium carbonate is sometimes added to SHMP to raise the pH to 8.0–8.6, which produces a number of SHMP products used for water softening and detergents.

A significant use for sodium hexametaphosphate is as a deflocculant in the production of clay-based ceramic particles. It is also used as a dispersing agent to break down clay and other soil types for soil texture assessment.

It is used as an active ingredient in toothpastes as an anti-staining and tartar prevention ingredient.

Food additive

As a food additive, SHMP is used as an emulsifier. Artificial maple syrup, canned milk, cheese powders and dips, imitation cheese, whipped topping, packaged egg whites, roast beef, fish fillets, fruit jelly, frozen desserts, salad dressing, herring, breakfast cereal, ice cream, beer, and bottled beverages, among other foods, can contain SHMP.

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