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HS Code |
304361 |
| Chemical Name | Sodium Hydrosulfite |
| Synonyms | Sodium Dithionite |
| Chemical Formula | Na2S2O4 |
| Appearance | White to yellowish crystalline powder |
| Molecular Weight | 174.11 g/mol |
| Solubility In Water | Soluble |
| Odor | Slight sulfur dioxide odor |
| Ph Value | Approximately 6-7 (1% solution) |
| Melting Point | Decomposes before melting |
| Stability | Decomposes in presence of moisture and heat |
| Primary Uses | Textile dyeing, bleaching, and water treatment |
| Cas Number | 7775-14-6 |
As an accredited Sodium Hydrosulfite Industrial Grade factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | Sodium Hydrosulfite Industrial Grade is packaged in a 50 kg woven plastic bag with an inner polyethylene liner for moisture protection. |
| Shipping | Sodium Hydrosulfite Industrial Grade is typically shipped in tightly sealed 50 kg drums or bags to prevent moisture exposure. It is classified as a dangerous good and should be transported with proper labeling, away from heat and incompatible substances. Handling requires appropriate safety precautions to prevent fire, decomposition, or hazardous releases. |
| Storage | Sodium Hydrosulfite Industrial Grade should be stored in a cool, dry, well-ventilated area away from heat sources, moisture, and incompatible substances such as acids and oxidizers. Keep the container tightly closed and protected from direct sunlight. Avoid exposure to air, as the chemical is sensitive to oxidation and may degrade. Store in approved containers clearly labeled for industrial use. |
Applications of Sodium Hydrosulfite Industrial Grade in Industrial ManufacturingSodium hydrosulfite, manufactured in industrial grade, serves as a key reducing agent for multiple manufacturing sectors. The following application scenarios demonstrate real-world industrial use cases, including compliance, process integration, and downstream product manufacturing. 1. Textile Dyeing and Printing Reduction ProcessesTextile manufacturers utilize sodium hydrosulfite primarily for reduction cleaning and vat dyeing of cellulosic fibers such as cotton and viscose. The material applies specifically during the dye bath and after-treatment steps to achieve color intensity, fastness, and uniformity in continuous and batch operations. Factories optimize its dosage per fiber type and dye class, adjusting in response to pH, liquor ratio, and color formula. Advanced dosing systems and oxygen-scavenging protocols help meet strict fastness requirements under regional legislation. Industry compliance standards
Typical usage ratio
Downstream process integration
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2. Paper and Pulp BleachingMany pulp and specialty paper mills employ sodium hydrosulfite in reduction bleaching, improving brightness while minimizing oxidative fiber degradation. Typical operations include deinking, mechanical pulp brightening, and recycled fiber processing. Operators dose according to process consistency, furnish composition, and brightness targets, following strict chemical handling protocols and regulatory effluent standards. In deinking lines, real-time titration and process logic controllers maintain the necessary reducing environment across continuous bleaching vessels. Industry compliance standards
Typical usage ratio
Downstream process integration
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3. Kaolin and Clay Mineral Bleaching in Ceramics and FillersCeramics and non-metallic mineral processing plants deploy sodium hydrosulfite to bleach kaolin and various clays by reducing ferric iron to ferrous, which improves whiteness and value. Dosing levels vary by ore composition, often determined by laboratory titration and pilot runs. Process operation involves slurry preparation, chemical addition under controlled temperature/agitation, followed by thorough washing and filtration to remove reaction byproducts and unreacted reagents. Strict monitoring prevents iron re-oxidation and supports downstream product brightness control. Industry compliance standards
Typical usage ratio
Downstream process integration
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4. Chemical Synthesis of Sulfur DyesDye manufacturers use sodium hydrosulfite to reduce precursor intermediates in sulfur dye production. This stage occurs under high-temperature aqueous conditions in closed reactors, strictly monitored for safety, yield, and reductant efficiency. The precise ratio varies per dye class, but maintaining an excess reducing atmosphere throughout synthesis is critical. Quality control covers residual byproducts and final dye strength. Operators follow industry-specific handling, disposal, and product assay protocols. Industry compliance standards
Typical usage ratio
Downstream process integration
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5. Water Treatment and Effluent DecolorizationIndustrial facilities operating dyehouses, paper mills, or leather tanneries actively utilize sodium hydrosulfite for effluent treatment. The process targets color and chemical oxygen demand (COD) reduction in discharged wastewater. Facilities meter the raw material into holding tanks or reaction tanks with careful pH and redox control, followed by downstream precipitation and filtration. On-line analyzers support process optimization, and site teams document dosage and performance to satisfy permit obligations and water discharge consents. Industry compliance standards
Typical usage ratio
Downstream process integration
Final product types
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Watching sodium hydrosulfite evolve from a specialty chemical into a backbone material across several key industries gives us, as manufacturers, a distinct vantage point. Our daily work revolves around careful attention to purity, reaction control, and steady supply. The industrial-grade product isn’t simply a commodity — it responds directly to growing demands in dyeing, paper processing, leather, and more. Working with it is about more than shipping bags of white powder. We see every ton as the result of strict process discipline, skilled handling, and years of practical problem-solving.
The sodium hydrosulfite leaving our reactors consistently meets or exceeds the industry-standard purity, typically centered above 88%. This is no accident. We tune temperature, pressure, and raw material ratios at every stage. Products targeted for textile applications may reach 88%-90% purity, while those aimed at pulp and paper might sit slightly lower if dictated by technical and economic factors. Particle size and moisture content come under routine control as well. Even small changes in these parameters exert real influence on storage, transport, dissolution rate, and, most importantly, practical use.
Many users glance at technical sheets and find similar numbers across suppliers and grades. In our experience, true reliability gets tested under challenging process conditions. Two lots labeled “industrial grade” may perform very differently at the plant scale. Color change, “off smells,” or unexpected crystal growth present real headaches. Our tight control over raw sodium formate, caustic soda, and sodium dithionite longevity leads customers to notice less residual impurity and a more stable product shelf life. We never treat trace iron, zinc, or dirt levels as minor details — these things matter over time. Our facilities invest heavily in dust reduction, automated filtration, and controlled drying, yielding a product that resists caking and packs efficiently.
Sodium hydrosulfite gets its reputation from its performance as a reducing agent, most notably in the textile industry. Fabric mills running continuous dyeing and vat dye reduction lines use it day in and day out. In these settings, the chemical’s ability to strip color, reduce vat dyes and indigos to leuco forms, and provide bleaching action gives it a practical edge. We see firsthand how production interruptions or erratic dosing cause tinting problems, spotty color, or waste. End users rely on batches that dissolve quickly in water, remain free of clumps, and handle well under automated feeders. These aren’t just bullet points — customer complaints often trace back to missed process targets or poor storage at the manufacturing end.
Beyond textiles, the pulp and paper sector leans heavily on sodium hydrosulfite’s reducing strength. Deinking recycled paper and lightening wood pulp can hinge on how fast and completely the chemical acts in situ. Our product regularly gets evaluated not only on cost per ton, but by the brightness and cleanliness it delivers to finished sheets. In the leather tanning business, small dosing mistakes can alter color or degrade hide quality. We supply drum and bulk quantities to tanneries who look for minimal residue and stable reactivity, even after weeks of storage. Print shops, photographic chemical suppliers, and mineral processors also use our sodium hydrosulfite for selective reduction and metal extraction jobs. Each application invites fresh feedback. Our batch feedback process handles claims about odd odors, slow dissolution, or off-color so we can adjust upstream.
No one who’s ever overseen a large reduction bath regards “industrial grade” as a vague label. Reputable downstream users put faith in us because they know how tightly the chemistry affects their process windows. Take textile mills relying on color consistency from vat dye to finished bolt of fabric. Variations in sodium hydrosulfite strength or impurity levels force operators to tweak dosing on the fly or see their precious dyes wasted. We keep a feedback loop not just with lab testing, but with direct visits to site. Field engineers share her real-world stories about how moisture control during storage, or batch-to-batch particle uniformity, prevented clogged feeders or dye bath failures. We bring these lessons home, tuning fineness, packaging, and anti-caking procedures to make life easier at the consumption end.
For paper producers, the link between sodium hydrosulfite batch quality and pulp brightness is hard to overstate. We learned early how a run of “out-of-spec” product can downgrade paper whiteness, triggering costly complaints. Modern deinking lines require precise dose control and rapid chemical action. Even small excesses of base or active ingredient can cause machine foaming or sticky residues, affecting production speed and sheet quality. By adjusting our drying stage and safe handling protocols, we help our customers cut unplanned downtime.
Our sensitivity to process details comes from years of close cooperation with users in Taiwan, India, South America, and Europe. Each region’s raw water quality, climate, and plant design influences how our sodium hydrosulfite performs. We don’t just enforce a single “one-size-fits-all” protocol. Our flexibility in special blending, anti-dust coating, and safe packaging options has helped end-users find solutions tailored to their site-specific needs without sacrificing core chemical strength.
Anyone who works around sodium hydrosulfite understands the risks. Improper storage or mishandling can lead to spontaneous decomposition, heat build-up, fire danger, or severe health effects. Our employees are trained in both the visible hazards and the subtler chemical dynamics of the product. We never minimize the importance of good ventilation, dry storage, and first-in-first-out stock rotation. We keep close tabs on local and international regulations regarding hazardous materials, shipping safety, and secondary containment. The safety cultures at customer sites depend on how we document storage protocols, emergency response steps, and disposal best practices. Field accidents traceable to poor packaging, poorly-trained handlers, or contaminated product have taught the entire industry lasting lessons.
Our facilities invest in chemical neutralization, dust suppression, and careful emission control to limit exposure. We work continuously to minimize production waste and reduce the presence of secondary pollutants like spent sodium formate or air emissions. Each year brings new advances in safe drum handling, sealed bulk packaging, and hazardous chemical labeling. Customers expect transparency around test results, and we respond with updated lab data and rapid recall procedures when standards call for it.
The term “industrial grade” often draws comparisons against technical grade, food grade, and laboratory grade chemicals. In the case of sodium hydrosulfite, industrial grade focuses on balancing strong reducing power with cost-effective performance and broad compatibility across large processes. Unlike food or pharma grades, our industrial product doesn’t undergo exhaustive purification and isn’t made under sterile or ultra-clean conditions. Target impurity thresholds stay tighter than mere technical grade, but won’t match food-use certifications. We strike a balance between consistency, practicality, and price that appeals most to high-volume users who need stable performance, not extreme purity.
We’ve seen some end users accidentally source food or analytical grades for bulk industrial processes, paying a premium with little added value. For industrial-scale dyeing, leather work, or pulp bleaching, these high-purity variants rarely return a measurable benefit in output. Instead, process reliability and steady supply matter most. Our development teams work to minimize cost-driving ingredients and streamline logistics, but never at the expense of essential quality benchmarks. Bagging, shipping, and customer technical support encourage frequent feedback. If a regional customer flags a difference in flow or solubility compared to other suppliers, we chase down the root cause and implement changes.
For those choosing between industrial and lower-grade blends, the main risk tends to come from batch inconsistency or poorly controlled contaminants. Unstable chemical composition leads directly to uneven reductions, material waste, and process shutdowns. We recognize the temptation to chase lower costs through off-specification product, but operational history shows quality pays back in lowered plant downtime and fewer emergency calls.
We keep our eyes on upcoming trends affecting sodium hydrosulfite demand and production. Environmental compliance keeps rising in importance. Paper and textile operators want to cut effluent loads and air emissions tied to sodium hydrosulfite fate. Innovations in closed-loop recycling, automatic dosing systems, and less hazardous byproducts come up at every customer audit. Our teams work on shaping packaging that reduces dust and lets each batch run longer before caking or sticking. Years ago, loose woven bags and untied drums caused plenty of headaches — now, tighter bagging and lined bulk tanks keep product safer and easier to handle.
Unexpected disruptions, such as new import tariffs, environmental clampdowns, or global supply shocks, push us to rethink warehouse logistics and cross-border shipments. We keep redundant storage, multiple raw material sources, and backup shipping plans ready to avoid running short. Customer trust depends most on our ability to ship on short notice with strict adherence to agreed standards.
Our history tells us that roots in manufacturing matter. We don’t copy trader price lists or off-the-shelf specifications; we adapt production for real customer challenges. Factory visits, site audits, and raw batch samples flow back and forth so we catch process issues before they reach the end user. We want to be the partner operators call for technical help, product data, or just a second opinion about new applications. Each delivery reflects years of cumulative knowledge about what makes sodium hydrosulfite not just “industrial grade,” but genuinely reliable and efficient.
One recurring frustration from textile houses and paper mills concerns the chemical’s shelf life and tendency to absorb water. In hot and humid climates, improperly stored sodium hydrosulfite can rapidly lose strength, leaving operators to guess at dosing and potentially ruining entire batches. We respond with investments in moisture-proof packaging, such as polyethylene-lined paper bags and reusable sealed drums. Our warehouse teams devote hours to keeping dry, shaded storage conditions and work closely with logistics partners for quick, weather-protected delivery. Over time, this reduces obsolete inventory and sharpens cost control for customers.
Another frequent complaint addresses unexpected odor or dust generation during handling. Older facilities using open-method delivery risk inhalation exposure and product loss. We advise and support upgrades to closed gravity feeders, vacuum hoists, or augers that keep operators safe and secures the material until it enters the process tank. Technical reps visit plants regularly, offering storage assessments and product usage training. Simple changes in work practice reflect dramatic improvements in both output quality and worker satisfaction.
Storage guidelines remain a constant theme. Sodium hydrosulfite’s instability in the presence of moisture and elevated temperature doesn’t leave room for complacency. Labeling alone won’t compensate for poor handling. We distribute best practice handouts and host workshops focused on safe opening, weighing, and waste disposal. The result is fewer workplace incidents and less product spoiled in the field.
We take pride in traceable production records and regular supplier audits. Lab team members cross-check every batch, using up-to-date titration, colorimetric, and physical property testing. We publish key data and make it available on request — not just when something goes wrong, but as a matter of routine transparency. This accountability builds relationships with process engineers and purchasing agents alike, who learn to expect steady performance from every lot they receive.
Customer technical requests drive much of our ongoing investment. New process demands, such as faster dissolution, smaller particle sizing for automated systems, or anti-caking additives, lead to fresh pilot-scale production runs. We invite selected customers to participate in pilot tests and share feedback, allowing for co-development partnerships that directly shape new product variants. Our willingness to adapt lines and tweak formulation has opened new markets for sodium hydrosulfite in water treatment, ore beneficiation, and even specialty food processing (in those rare cases where industrial grade blends meet the user’s exact expectations).
In our shop-floor experience, sodium hydrosulfite industrial grade remains a practical and essential ingredient for a wide span of producers. Its core properties as a powerful yet controllable reducing agent continue to drive innovation not just in chemistry, but in applied engineering and plant operations. Our direct communication channels, on-site support, and clear labeling play as much of a role as the technical product itself.
Developing strong supplier partnerships shortens troubleshooting time and reduces costly mistakes. As manufacturers, we’re fully invested in the journey from raw input streams to finished, functioning material at the customer’s site. We listen as much as we lead. The future direction for industrial sodium hydrosulfite includes increasing automation, safer delivery, expanded technical application support, and a move toward circular economy practices. With each new challenge — whether process waste reduction, hazard mitigation, or evolving performance goals — our motivation grows. We know from decades of hands-on manufacturing that success depends on a mix of chemistry, operational discipline, and a willingness to keep improving the details that matter.
Sodium hydrosulfite industrial grade doesn’t simply pop out of a vat in isolation — it’s a result of careful work, trial, error, and listening to those who use it most. This cycle of improvement keeps both us and our customers poised for what comes next in the diverse industries this product serves.