Sodium Thiosulfate 99% Industrial Grade Sodium Hyposulfite High Purity Sodium Thiosulfate Anhydrous & Crystal Sodium Thiosulfate Na2s2o3 Industrial Chemical

• Customization: Available
• CAS No.: 7772-98-7
• Formula: Na2s2o3
• Model NO.: Industrial Grade 99%
• EINECS: 231-867-5
• Certification: CCIC, CIQ, ISO
• Purity: 98%~99%
• Type: Thiosulfate
• Appearance: Transparent Granular Crystals
• Grade Standard: Industrial Grade
• Transport Package: Woven Bags
• Specification: 25kg
• Trademark: Sheng Jasmine
• Origin: China
• HS Code: 2832300000
• Production Capacity: 80000000ton/Year

Product Description

Product Description:
Industrial grade sodium thiosulfate, commonly known as sodium thiosulfate or hypothalamic acid, is an inorganic thiosulfate. Its pentahydrate form has the chemical formula Na2S2O3·5H2O, with a relative molecular weight of 248.18; the anhydrous form has the chemical formula Na2S2O3, with a relative molecular weight of 158.11. This product is a colorless, transparent/slightly yellowish crystalline granule with no obvious odor. It readily effloresces in dry air and readily absorbs moisture and clumps in humid air. It is readily soluble in water, sparingly soluble in ethanol, and its aqueous solution is weakly alkaline, with a pH of approximately 8.0-9.5. It possesses excellent reducing, dechlorinating, and complexing properties, making it an indispensable basic chemical raw material in textiles, papermaking, water treatment, chemicals, metallurgy, electroplating, and other fields. When heated to 100ºC, it loses its water of crystallization to become anhydrous sodium thiosulfate. Above 150ºC, it decomposes to form sodium sulfate, sodium sulfide, and sulfur. It must be stored in a sealed container in a cool, dry place, away from high temperatures, open flames, acidic substances, and strong oxidizers to prevent moisture absorption, weathering, and decomposition. The product strictly complies with the HG/T 2328-2006 industrial sodium thiosulfate standard, has stable performance, high cost-effectiveness, and is suitable for large-scale industrial continuous production.
Parameter:

project	Details
Product name	Sodium thiosulfate (industrial grade)
Alias	Baking soda, Hypo
Appearance	Colorless and transparent / with slightly yellowish crystalline granules, easily absorbs moisture, and is easily soluble in water.
Chemical formula	Na2S2O3·5H2O (pentahydrate), Na2S2O3 (ahydrate)
CAS	7772-98-7 (Water 5), 7757-83-7 (Waterless)
Water soluble	Easily soluble in water, sparingly soluble in ethanol
Grade	Industrial grade (superior/first-class), compatible with high-purity grade (electronic grade).
Na2S2O3·5H2O, %≥	99.0 (Superior Grade), 98.0 (First Grade)
Water insoluble, %≤	0.01 (Superior Grade), 0.03 (First Grade)
Sulfide (as Na2S), %≤	0.001 (Superior Grade), 0.003 (First Grade)
Iron (Fe), %≤	0.003 (Superior Grade), 0.005 (First Grade)
Lead Time	Shipment within 5-15 days after receiving advance payment or irrevocable letter of credit at sight.
Sample	Free sample available
Payment Term	T/T or L/C at sight

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Application Description:
1. Textile and Dyeing Industry: Used as a dechlorinating agent after fabric bleaching to remove residual chlorine and prevent fiber yellowing and brittleness; as a dyeing auxiliary and resist agent to improve dyeing uniformity and color fastness.
2. Paper Industry: Used as a dechlorinating agent and bleaching auxiliary for pulp bleaching to reduce chlorine residue, improve paper whiteness and strength, and protect fiber properties.
3. Water Treatment: Dechlorinating agent for municipal water supply, industrial wastewater, and circulating water to remove residual chlorine; reduces and removes heavy metal ions; used as a corrosion inhibitor to protect pipe networks and equipment.
4. Chemicals and Pesticides: Used as a reducing agent and complexing agent in organic synthesis; used in the manufacture of pesticides such as insecticides, and as intermediates for dyes, pigments, and detergents.
5. Electroplating and Mineral Processing: Complexing agent for cyanide-free electroplating to improve coating uniformity and adhesion; used in precious metal flotation and extraction to improve recovery rates.
6. Photography and Light Industry: A traditional film fixer that dissolves unexposed silver halides to fix images; used in leather tanning, fur degreasing, and other processes.
7. Gold Metallurgy: An environmentally friendly leaching agent for wet gold extraction, partially replacing cyanide processes; safe and low in toxicity, suitable for green metallurgical upgrades.
Production Process:
Our Process: Industrial-grade sodium thiosulfate is produced using the mature and stable sodium sulfite process. Sulfur and sodium sulfite are the main raw materials, activated carbon is used as a decolorizing agent, and catalysts and stabilizers are added:
1. Raw Material Pretreatment: Sulfur is crushed and purified; sodium sulfite is dissolved and prepared.
2. Synthesis Reaction: Sulfur is added to a reaction vessel and heated to dissolve. Sodium sulfite solution is slowly added, controlling the temperature at 80-90ºC and the pressure at 0.1-0.13 MPa, reacting to produce crude sodium thiosulfate solution.
3. Filtration and Impurity Removal: Unreacted sulfur and mechanical impurities are removed.
4. Decolorization and Purification: Activated carbon is used for decolorization, and filtration removes colored impurities and suspended solids.
5. Evaporation and Concentration, Cooling and Crystallization, Centrifugation, Drying and Sieving: Industrial-grade pentahydrate sodium thiosulfate is obtained; the anhydrous product can be further dehydrated by heating.
6. Industrial-grade products focus on reaction efficiency, yield, and cost control. The process is mature, the operation is stable, the sulfur conversion rate is high, the wastewater is recycled after treatment, and the waste heat is recovered, which meets the requirements of low-carbon and clean production.
Our Advantages:
1. Stable and Compliant Quality: Strictly adhering to HG/T 2328-2006, with a purity of ≥99.0% for superior grade and ≥98.0% for first grade. Uniform granules, good solubility, and minimal clumping meet the requirements of large-scale continuous industrial production.
2. Cost and Capacity Advantages: Annual capacity of 15,000 tons. Large-scale production and integrated raw material supply ensure excellent cost-effectiveness, stable delivery times, and the ability to handle long-term orders and full container exports.
3. Mature and Reliable Process: The sodium sulfite process boasts high automation, few side reactions, and high yield. The production process is environmentally friendly and safe, with wastewater and waste heat recycled, meeting green chemical industry requirements.
4. Strong Application Adaptability: Available in granular/powder forms to meet the diverse needs of various fields such as textiles, papermaking, water treatment, electroplating, and metallurgy.
Comprehensive Service and Certification: Providing a complete set of export documents including COA, MSDS, customs declaration, and commodity inspection. Free samples are available, with flexible payment methods and a logistics network covering major ports worldwide.