Character & Purpose: White crystal powder，Mainly use for medicine,
glass, printing and dyeing, fertilizer,etc..
Packing: in 25KG net PP PE bags
Formula: Na2S2O3
Standard:
| Item | Spec. | Typical Results |
| Na2S2O3/% | 97.0 Min. | 97.25 |
| Water-insoluble/% | 0.03 Max. | 0.01 |
| Sulphide(as Na2S)/% | 0.001 Max. | 0.0002 |
| Fe /% | 0.005 Max. | 0.01 |