2026-10-07
Sodium Hydrosulfite (Sodium Dithionite) CAS 7775-14-6｜Industrial Reducing & Bleaching Agent
1. Basic Product Information (Compliance Parameters | CAS Registration)
Sodium hydrosulfite, also known as sodium hyposulfite, is a highly versatile reducing agent for industrial and food-grade applications. It is a standard mainstream chemical product in the global chemical market.
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Chemical Name: Sodium Dithionite
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English Alias: Sodium Hydrosulfite / Sodium Dithionite
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CAS No.: 7775-14-6
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EINECS No.: 231-890-0
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UN No.: 1384
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Molecular Formula: Na₂S₂O₄
Physical and Chemical Properties
It appears as white sand-like crystals or pale yellow powder. It features stable chemical activity and outstanding reducing performance, suitable for a wide range of industrial processes. Key physicochemical parameters are listed below:
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Bulk Specific Gravity: 0.7–1.0 g/cm³
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Melting Point: 300 °C (decomposes at high temperature)
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Ignition Temperature: 250 °C
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Solubility: Insoluble in ethanol, soluble in sodium hydroxide solution
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Core Characteristics: Strong reducibility with remarkable decolorization, impurity removal and anti-oxidation effects. It reacts violently with water, so strict moisture-proof and waterproof measures are required.
2. Core Application Fields | Multi-purpose Industrial Auxiliary Agent
As a premium industrial reducing agent, bleaching agent, antioxidant and color fixative, Sodium Hydrosulfite CAS 7775-14-6 is widely used in five major industries: textile, paper-making, food, ceramics and pharmaceuticals. It fits various fine production processes and delivers better cost-effectiveness than comparable chemical additives.
2.1 Textile Printing & Dyeing Industry (Primary Application)
Sodium hydrosulfite acts as a dedicated reducing agent and bleaching agent for textile printing and dyeing. It is widely used in the processing of cotton, hemp, silk, chemical fiber and other fabrics. It effectively removes natural pigments, impurities and oxidative stains from fiber materials to achieve uniform bleaching.
In reduction dyeing and printing processes, it rapidly reduces dye molecules to improve dye adhesion and color uniformity. It can also be used for color stripping after dyeing and vat cleaning, boosting color brightness and stability of finished textiles. It is an essential chemical auxiliary for the textile industry.
2.2 Pulp and Paper Making Industry
It is specially formulated for bleaching wood pulp, waste pulp and recycled pulp. It efficiently decomposes chromophoric groups in pulp and removes lignin impurities to greatly enhance pulp brightness and purity.
Compared with traditional bleaching agents, sodium hydrosulfite leaves no residual odor and will not damage fiber toughness. It improves paper flatness and color uniformity, and is widely used in the production of tissue paper, industrial paper and packaging paper.
2.3 Food Processing Industry
Food-grade sodium hydrosulfite is an approved food additive, serving as a color protector, preservative and antioxidant. It is mainly applied in processing dried fruits, preserved fruits, dried vegetables, edible fungi and other agricultural food products.
It effectively inhibits oxidative browning, preserves the natural color of food to prevent darkening and discoloration. Meanwhile, it suppresses microbial growth to extend shelf life, complying with food safety standards.
2.4 Ceramic Industry
It is widely used for ceramic raw material purification and glaze optimization. It precisely removes iron, manganese and other metallic impurities from kaolin, feldspar, quartz and other ceramic materials to eliminate discoloration and spots.
It can also bleach and modify ceramic glazes to increase the whiteness of ceramic bodies and glaze luster, improving the appearance and grade of finished ceramics. It is a critical impurity removal agent for high-end ceramic manufacturing.
2.5 Pharmaceutical and Fine Chemical Industry
In pharmaceutical synthesis and fine chemical production, it functions as an efficient reducing agent and stabilizer for intermediate synthesis, raw material deoxygenation and anti-oxidation. It stabilizes chemical reaction systems and raises the purity and qualification rate of pharmaceutical and chemical products, meeting high-precision fine production requirements.
3. Professional Storage & Transportation Specifications (Safety Compliance)
Sodium hydrosulfite is chemically active. It oxidizes easily and may heat up and deteriorate when exposed to moisture, and reacts vigorously with water. To maintain stable product performance and mitigate safety risks, storage and transportation must follow the below regulations, which are core control standards for bulk industrial procurement:
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Storage Environment: Store in a dedicated cool, dry and well-ventilated warehouse. Avoid direct sunlight, high temperature and humid conditions. Keep warehouse humidity below 75%, keep away from heat and fire sources to prevent spontaneous combustion.
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Segregated Storage: Store in separate zones. Do not store or transport together with oxidants, acids or flammable chemicals, to avoid chemical reactions and potential hazards.
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Warehouse Facilities: Post clear safety signs in the storage area. Equip the warehouse with explosion-proof lighting and forced ventilation systems. Conduct regular inspections to eliminate risks and ensure compliance.
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Transportation Requirements: Transport in fully sealed packaging with moisture-proof, waterproof and shockproof protection. Follow hazardous goods transportation regulations and avoid rain exposure and direct sunlight.
4. Standard Product Packaging Specifications
We adopt industrial standard sealed packaging with excellent sealing and moisture resistance, maximizing product activity and preventing quality loss during storage and transportation. Suitable for export bulk orders and domestic large-volume procurement:
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Packaging Type: 50L fully open steel drum
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Net Weight: 50 Kg per drum
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Gross Weight: 53.8 Kg per drum
5. Product Advantages & Procurement Services
Our supplied industrial grade / food grade Sodium Hydrosulfite (CAS 7775-14-6) features high purity, stable reducing performance and low impurity content. All indicators meet national standards and export testing requirements for various domestic and international industrial applications.
We support bulk supply and customized delivery to satisfy long-term procurement demands from textile, paper, ceramic, food processing and other industries.
