Sodium hexametaphosphate / hexasodium metaphosphate / Graham's salt / cargan / sodium phosphate glass / Graham salt / hexameta / sodium hexametaphoshpate

Cas No. 10124-56-8
Molecular formula Na6O18P6; (NaPO2) 6
Molecular weight 611.77
Sodium hexametaphoshpate
Sodium hexapolymetaphosphate is colorless transparent glass flake or white granular crystal. The specific gravity is 2.484 (20 ℃). It is easily deliquescent in the air and soluble in water. It dissolves 973.2 grams per liter of water at 20 ℃ and 1744 grams per liter of water at 80 ℃. The PH value of 1% solution is about 5.5-6.5, insoluble Organic solvent, in neutral medium, the final product of hydrolysis is orthophosphate. It is very hygroscopic, and when exposed to air, it can gradually absorb moisture and become a viscous material. It can synthesize soluble double salt with alkaline earth metallization, so it has the function of dissolving scale and is a good water softener.
Melting point: 616 ℃
Q / (HG) SJ 738-1997
Item Item Analysis and Purification
(AR) (CP)
Content (P2O5) Assay,% 65.0-70.0 65.0-70.0
Lnsoluble matter
in water,% ≤0.01 0.03
Chloride (Cl), Chloride,% ≤0.002 0.01
Sulfate (SO4) Sulfate,% ≤0.01 0.03
Phosphoric acid (PO4) Phosphate qualified iron (Fe) Iron,% ≤0.0050.02
Arsenic (As),% ≤0.0002 0.0005
Heavy metals (as Pb) Heavy metals,% ≤0.0020.005
Potassium reduced potassium permanganate qualified
Permanganate reducing sudstances.

The product is mainly used for boiler water softener, printing,Titanium Dioxide and dyeing bath softener and paper making diffusing agent. It is also used in corrosion inhibitors, flotation agents,pvc resin,dispersants and high-temperature bonding agents. Others are used for washing utensils and chemical fibers to remove iron from pulp. It is also used for soil analysis.

We have warehouse in the UK,mainly sell boric acid flakes.