Sodium hydrosulphite
General name: Sodium hydrosulphite Molecular formula: Na2S2O4 Appearance:white free-flow crystal powders Smell:flavourless or smell of sulfur dioxide Packing:50kg net iron drums with double inner polybags. Application: 1. Widely used in textile industry for vat dyeing, reduction cleaning, printing and stripping, textile textile bleaching . 2. It is also used in bleaching paper pulps , especially mechanical pulps, it's the most fittable bleaching agent in pulps. 3. It is used in bleaching kaolin clay, fur bleaching and reductive whitening, bleaching of bamboo products and straw products, 4. It is used in mineral, the compound of thiourea and other sulphides. 5. It is used as reducing agent in chemical industry. 6. Sodium hydrosulfite food additive grade is used in foodstuffs, as bleaching agent and preservative dried fruits, dried vegetable, vermicelli, glucose, sugar, rock sugar, caramel, candy, liquid glucose, bamboo shoots, mushrooms and canned mushrooms.| INDEX | 90% | 88% | 85% | FOOD ADDITIVE |
| Na2S2O4 | ≥90% | ≥88% | ≥85% | ≥85% |
| Fe | ≤20ppm | ≤20ppm | ≤20ppm | ≤20ppm |
| Zinc(Zn) | ≤1ppm | ≤1ppm | ≤1ppm | ≤1ppm |
| Other heavy metal (calculated as Pb) | ≤1ppm | ≤1ppm | ≤1ppm | ≤1ppm |
| Water Insolubles | ≤0.05% | ≤0.05% | ≤0.05% | ≤0.05% |
| Shelf Life(month) | 12 | 12 | 12 | 12 |