Sodium Hexametaphosphate

Sodium Hexametaphosphate

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  • Sodium Hexametaphosphate
  • 2835.39.50
  • (NaPO3)6
  • White Granules
  • 10124-56-8
  • Hexasodium metaphosphate, Calgon S, Glassy sodium
  • 840 @ 25 kg PP bag with PE bag inner line
    21 MT / 20’FCL
    840 @ 25 kg PP/PE bags
    21 MT / 20'FCL
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Brief overview

Sodium hexametaphosphate (SHMP), is basically a hexamer of the chemical formula (NaPO3)6. It is also called Graham’s salt or hexasodium metaphosphate. It is white and granular in appearance and hydrolyses in aqueous solution, during acidic conditions. It is soluble in water, while insoluble in organic solvents. It is a sequestrant that binds with calcium ions.



Manufacturing Process

Sodium dihydrogen phosphate: The soda solution was first subject to neutralization reaction with phosphate acid at 80~100 for 2h; the resulting sodium dihydrogen phosphate solution was concentrated by evaporation, cooled and crystallized to obtain sodium dihydrogen phosphate dihydrate and heated to 110~230 to remove two crystal water; further be subject to heating to remove the structural water; further being heated to 620 for dehydration to result in the molten sodium metaphosphate and further polymerized into sodium hexametaphosphate, and discharged; apply chilling shock for 650 to 60~80 for flaking, and crush to obtain the hexametaphosphate products. Its reaction formula is as below:

Na2CO3 + 2H3PO4 + H2O 2NaH2O4•2H2O + CO2

NaH2PO4•2H2O [] Na2H2PO4 + 2H2O

2NaH2PO4 [] Na2H2P2O7 + H2O

Na2H2P2O7 2NaPO3 + H2O

6NaPO3 [] (NaPO3)6


Phosphorus pentoxide method: put the yellow phosphorus into a steam of dry air for combustion and oxidation, the cooling obtained phosphorus pentoxide is mixed together with soda in certain ratio (Na2O: P2O5 = 1~1.1). Put the mixed powder in a graphite crucible and heated indirectly to have it dehydrated and agglomerated, the resulting sodium hexametaphosphate is subject to flaking upon chilling shock and pulverized to obtain industrial hexametaphosphate products. The reaction formula is as below:

P4 + 5O2 2P2O5

P2O5 + Na2CO3 2NaPO3 + CO2

6NaPO3 [] (NaPO3)6

Food Industry
Sodium hexametaphosphate is used as a sequestrant which improves the quality and stability of the food products. It is used under E number E425i. 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 sodium hexametaphosphate.

Other Applications
Sodium hexametaphosphate is used for water softening and detergents. Also used as a dispersing agent to break down clay and other soil types. One of the lesser-known uses for sodium hexametaphosphate is as a deflocculant in the making of terra sigillata, a ceramic technique using a fine particled slip.

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