Character & Purpose: White crystal powder, Mainly used in medicine, tannage and tanning.
Packing: 25KG PP/PE BAG
Formula: Na2SO3
Standard: GB1887-98
| Item | Spec. | Typical results |
| Sodium Sulphite/% | 97.0 Min. | 97.52 |
| Iron Content/% | 0.003 Max. | 0.0008 |
| Water insolubles/% | 0.03 Max. | 0.01 |
| Free Alkalinity(as Na2CO3)/% | 0.4 Max. | 0.15 |
| Sodium Sulphate/% | 2.5 Max. | 1.8 |
| Sodium Chloride(as NaCl)/% | 1.0 Max. | 0.7 |