Properties White or colorless crystals, efflorescent in air, easily soluble in water but not in organic solution. Its water solution is alkaline. PH value of 1% solution is 12.1, relative density at 1.62, melting point is 73.4℃ Uses Used as a water softening agent, cleaning agent in electroplating, color fixer in fabric dyeing and flux in enamel ware manufacturing and so on.
| ITEMS | STANDARDs |
| Main contents % >=</td> | 98 |
| Phosphorus pentoxide % >=</td> | 18.3 |
| Chloride, as cl % =< | 0.3 |
| Sodium oxide, as Na2O % =< | 15.5-19 |
| Sulfate, as SO4 % =< | 0.5 |
| Water insoluble % =< | 0.1 |
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