Specification:
| Test Item | Unit | The Standard |
| Appearance | -- | Colorless crystal or white crystalline powder |
| Assay | % | 99.0Min. |
| SO4 | % | 0.04Max. |
| Loss on Drying | % | 0.6Max. |
| Heavy Metals(as Pb) | ppm | 10Max. |
| Arsenic(as As) | ppm | 2Max. |
| Chloride | % | 0.5Max. |
| Alkalinity | -- | Conform Standard |
| Iodate, barium salt | -- | Conform Standard |
1 Raw material for preparation of iodide and dyestuff;


