SHMP stands for Sodium Hexametaphosphate which is nothing more than naturally occurring sodium carbonate heated together with a product of phosphate rock.  It is a free-flowing, white powder typically used in the chemical manufacturing, mining and water treatment applications.


We can offer SHMP of Chinese origin in standard packing sizes of 25 kg and 50 kg HDPE bags.


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General Information


  • As a water softener and detergent for leather tanning, dyeing, laundry work, textile processing.
  • For softening industrial water supplies.
  • As a dispersing agent in paint industry.
  • Used as sequestering agent in boilers.
  • Widely used as a whitening ingredient, which is used in some toothpastes and mouthwashes
  • Used as a food additive in dairy products, meat processing and canning of seafood.

Usage Chemistry

In boilers, SHMP converts Calcium ions in water to a form of Calcium Phosphate known as hydroxyapatite, Ca5(OH)(PO4)3. Hydroxyapatite forms a loose, fluffy precipitate that can be dispersed in the water with the aid of a polymer, and removed with blowdown. This effectively prevents mineral scale deposits from forming in the boiler. Phosphate is added to the boiler to precipitate calcium hardness entering from the feedwater. 


  • Remains stable under normal conditions.
  • Easily soluble.
  • Excellent whitening agent.
  • White crystalline powder.
  • Long shelf life.


CAS Number: 10124-56-8

Chemical Formula: (NaPO3)6

Molecular Weight: 611.8 g/mol

Appearance: White Powder or Granules

Effective P2O5: > 68%

pH (1% solution): 6.5-7.2

Moisture: 0.5% max.

Solubility at 25°C: 50 g/100 g water