| ITEM | SPECIFICATION | TEST RESULT |
| Na2SO3 content | 98.0 %min | 98.30% |
| Sodium sulphate | 1.5%max | 1.0% |
| Sodium chloride (NaCL) | 0.1%max | 0.08% |
| Iron (Fe) | 0.003%max | 0.0015% |
| Water insoluble | 0.05%max | 0.02% |
| Heavy metal as Pb | 10PPM MAX | 5PPM |
| Free alkali (as Na2CO3) | 0.30%max | 0.24% |
