Sodium Hexametaphosphate （SHMP）
Sodium Hexametaphosphate (Sodium Polyphosphates; Technical Sodium Tetra polyphosphate; Graham’s Salt); SHMP
Technical Specification: GB 1624-79
Total Phosphate （as P2O5）
Non-Active Phosphate content(P2O5), %<≤
Water Insoluble content %
Average degree of polymerization
Molecular Formula: (NaPO3)6
Molecular Weight: 611.76
Properties: Transparent glass slide or white crystalline powder. Strong moisture absorption; and become stick after the moisture absorption. Easily become damp in moist air,and easily dissolve in water. High solubility in water, but dissolved slowly; aqueous solution is acidity,easy hydrolyzed or turn into phosphate.
Applications: SHMP is used as a sequestrant and has applications with in a wide variety of industries.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. 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. The sodium hexametaphosphate causes the heavy particles in the slip to drop to the bottom allowing the fine particles to be siphoned off and applied to a green ware ceramic surface.
Sodium hexametaphosphate is also a whitening ingredient included in
some whitening toothpastes and mouthwashes.
Sodium Hexametaphosphate （SHMP） Images