Sodium Sulphite
| SPECIFICATION | |||||
| Specification | HIGH | FIRST | SECOND | THIRD | |
| Appearance: | : | White crystal powder | White or light grey power | White or light grey power | White or light grey power |
| Content min: | : | 96% | 92%` | 90% | 85% |
| Moisture max: | : | 1.00% | 2% | 4% | 4% |
| Free alkali: | : | 0.80% | |||
| Water | : | 0.10% | 0.10% | 0.10% | 0.10% |
| insoluble max: | : | ||||