loading
| Availability: | |
|---|---|
| Quantity: | |
Basic info
Model NO. | Sodium Hydrosulfite / Sodium dithionite | EINECS | 231-890-0 |
CAS No. | 7775-14-6 | Purity | 80%~90% |
Type | Sodium Hydrosulfite | Appearance | Powder |
Grade Standard | Industrial Grade | Product Appearance | White Crystalline Powder |
Odor | Odorless or Slight Sulfur Dioxide Odor | Relative Density (Water = 1) | 2.3-2.4 |
Bulk Density | 0.9-1.2 G/Cm³ | Auto-Ignition Temperature | 250 Celsius Degree |
Main Content | ≥ 85% - 88% | Sulfate (as So4) | ≤ 2.5% |
Water Content | ≤ 0.5% | Particle Size | > 100 μm ≤ 5% |
Heavy Metals (as Pb) | ≤ 10 Ppm | Solubility | Readily Soluble in Water; Insoluble in Alcohol |
Stability | Stable in Dry, Sealed Containers | MOQ | 22 Ton |
Trade Term | Fob/CFR/CIF | Lead Time | 10 to 15 Days After Order Confirmation |
Transport Package | 15kg/25kg/50kg/100kg Drum/Bag | Specification | Sodium Hydrosulfite 88% |
Trademark | ZHD | Origin | China |
HS Code | 2831101000 | Production Capacity | 50000 t / Year |
Storage | Cool Dry Place | Application | Food, industrial, textile |
Product Description
Sodium dithionite, chemically known as sodium bisulfite (molecular formula Na₂S₂O₄), is a strong reducing agent appearing as a white crystalline powder or pale yellow powder. It remains relatively stable under dry conditions at room temperature but exhibits highly reactive chemical properties. Exposure to moist air causes decomposition with heat generation, potentially leading to spontaneous combustion and the release of toxic sulfur dioxide gas.
Due to its potent reducing properties, sodium dithionite plays a critical role in the textile printing and dyeing industry. It is widely used for reductive dyeing, printing, bleaching, and decolorization of fabrics. Its name originates from its ability to safely remove dyeing defects, enabling “insurance” through color removal and re-dyeing. Additionally, it is applied in pulp bleaching within the paper industry, as well as in food processing (e.g., maltose production) and precious metal recovery. Given its flammability upon contact with water and tendency toward spontaneous combustion, storage and transportation of sodium dithionite must strictly adhere to hazardous chemical management regulations. It must be kept in a cool, dry place and maintained in sealed containers.
Package
Outer Package: iron drum
Inner Package: 2-layer PE bag
Net Weight Per Drum: 50 kg/drum, 250 kg/drum, 1250 kg/drum
22-25 ton/20'FCL without pallets
Application
1. Widely used in the textile industry for vat dyeing, reduction cleaning, printing, and stripping, textile bleaching.
2. Bleaching paper pulps, especially mechanical pulps, is the most suitable bleaching agent in pulps.
3. Bleaching kaolin clay, fur bleaching and reductive whitening, bleaching of bamboo products, and straw products.
4. In minerals, the compound of thiourea and other sulphides.
5. As a reducing agent in the chemical industry.
6. Sodium hydrosulfite food additive grade is used in foodstuffs, as a bleaching agent and preservative for dried fruits, dried vegetables, vermicelli, glucose, sugar, rock sugar, caramel, candy, liquid glucose, bamboo shoots, mushrooms, and canned mushrooms.
