Product Description
| CAS NO. | 7775-14-6/ 7631-94-9 | HS.CODE | 28311010 |
| EINECS NO. | 231-890-0 | HAZARD CLASS | 4.2 |
| UN NO. | 1384 | Storage Condition | Store at +5°C to +30°C |
| APPEARANCE | White to Gray-White crystalline powder | ||
| Odor | Odorless or a slight odor of SO2 gas | ||
| Solubility | Easily Soluble in Water, Insoluble in Ethanol | ||
| Grade of Quality | Superior G. | First G. | Qualified G. |
| Percentage of Sodium Hydrosulfite(Na2S2O4 ) Content | ≥90% | ≥88% | ≥85% |
| Water Insoluble | ≤0.1% | ≤0.1% | ≤0.3% |
| Sodium Thiosulfate(Na2S2O3) | ≤1.0% | ≤1.3% | ≤1.5% |
| Sodium Metabisulfite(Na2S2O5) | 5-7% | 5-7% | 5-7% |
| Sodium Bisulfite(NaHSO3) | ≤0.5% | ≤0.5% | ≤0.5% |
| Sodium Carbonate(Na2CO3) | 0.6-2% | 0.6-2% | 0.6-2% |
| Sodium Formate(HCOONa) | ≤0.5% | ≤0.5% | ≤0.8% |
| Zn | ≤0.0001% | ≤0.0001% | ≤0.0001% |
| Pb | ≤0.0001% | ≤0.0001% | ≤0.0001% |
| Fe | ≤0.005% | ≤0.005% | ≤0.005% |
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