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Oxalic Acid Dihydrate

    • Product Name Oxalic Acid Dihydrate
    • Alias Ethanedioic acid, dihydrate
    • Einecs 205-634-3
    • Mininmum Order 1 g
    • Factory Site Tengfei Creation Center,55 Jiangjun Avenue, Jiangning District,Nanjing
    • Price Inquiry admin@sinochem-nanjing.com
    • Manufacturer Sinochem Nanjing Corporation
    • CONTACT NOW
    VTB
    Specifications

    HS Code

    410145

    Chemicalname Oxalic Acid Dihydrate
    Chemicalformula C2H2O4·2H2O
    Molecularweight 126.07 g/mol
    Casnumber 6153-56-6
    Appearance Colorless, crystalline solid
    Meltingpoint 101-102 °C (decomposes)
    Solubilityinwater 14.3 g/100 mL (at 25 °C)
    Density 1.653 g/cm³
    Odor Odorless
    Ph 1.3 (0.1 M solution)
    Boilingpoint Decomposes before boiling
    Storagetemperature Room temperature, tightly closed, dry place

    As an accredited Oxalic Acid Dihydrate factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.

    Packing & Storage
    Packing White HDPE bottle with a blue screw cap, labeled "Oxalic Acid Dihydrate, 500g", includes safety symbols, manufacturer's details, and hazard warnings.
    Shipping Oxalic Acid Dihydrate should be shipped in tightly sealed containers, protected from moisture and physical damage. It must be labeled as a hazardous material and transported according to local, national, and international regulations. Store in a cool, dry, well-ventilated area away from incompatible substances during transit. Handle with appropriate personal protective equipment.
    Storage Oxalic Acid Dihydrate should be stored in a tightly sealed container in a cool, dry, and well-ventilated area, away from direct sunlight, heat, and moisture. Keep it separate from incompatible substances such as strong oxidizers and bases. Use secondary containment to prevent spills, and ensure containers are clearly labeled. Avoid storage near food or drink to prevent accidental ingestion.
    Application of Oxalic Acid Dihydrate

    Applications of Oxalic Acid Dihydrate in Industrial Manufacturing

    As a direct manufacturer of oxalic acid dihydrate, we supply global industries with consistent, high-purity grades tailored for demanding downstream applications. Our technical and regulatory teams work with major producers to ensure all deliveries fit seamlessly into validated processes with full traceability and documentation.

    1. Rare Earth Metal Refining

    Major rare earth producers use oxalic acid dihydrate in hydrometallurgical circuits for selective precipitation and purification of lanthanides from mixed ore leachates. Operators adjust acid concentration and dosing based on specific ore grades and extraction targets, as oxalate precipitation offers high selectivity for rare earth separation, especially in neodymium and praseodymium production. Process optimizations leverage real-time titration control to minimize co-precipitation of impurities, maintaining consistent product quality downstream.

    Industry compliance standards

    • ISO 9001:2015 Certified Quality Management
    • GB/T 3697-2008 (China National Standard for Rare Earth Oxides)
    • REACH Regulation (EC) No 1907/2006 registration for European shipments
    • Environmental standards per EU RoHS Directive 2011/65/EU

    Typical usage ratio

    • Stoichiometric dosing: 1.2–1.6 moles oxalic acid per mole rare earth ions, adjusted by ore impurity content and targeted precipitation pH

    Downstream process integration

    • Introduced after acid leaching and neutralization steps, before solid-liquid separation

    Final product types

    • High-purity rare earth oxides (e.g., Nd2O3, Pr6O11)
    • Rare earth carbonates
    • Rare earth metals (after subsequent thermal reduction)

    2. Metal Surface Treatment and Industrial Cleaning

    In metal finishing plants, oxalic acid dihydrate acts as a potent descaling and pickling agent for stainless steel, aluminum, and copper components. Its chelation properties remove ferric and non-ferrous oxide films without etching the base metal, critical in pre-plating cleaning lines and maintenance washes for high-value plant equipment. Operators closely monitor concentration to control cleaning rates and prevent hydrogen embrittlement, with continuous rinsing steps to ensure residue-free surfaces.

    Industry compliance standards

    • ASTM A380 for cleaning, descaling, and passivation of stainless steel parts
    • OSHA 29 CFR 1910.1200 Hazard Communication (worker safety)
    • EN 10204 Material Certificates where required
    • EU REACH registration and classification compliance

    Typical usage ratio

    • 2–8% w/w aqueous solution for surface cleaning and scale removal; operators reduce or increase concentration depending on oxide thickness and metal type

    Downstream process integration

    • Used in immersion bath or spray treatment lines following mechanical pre-cleaning and preceding final rinse/application step

    Final product types

    • Passivated stainless steel sheets and components
    • Electroplated parts (post-cleaning)
    • Precision machine components requiring oxide-free surfaces

    3. Textile Industry – Bleaching and Dye Purification

    Large-scale textile mills rely on oxalic acid dihydrate for controlled bleaching of plant-based fibers (such as cotton and flax), as well as for purification of synthetic dyes during finishing. Its reducing properties allow for targeted removal of iron-based stains and excess coloring agents, which helps mills achieve consistent fabric whiteness and dye clarity while protecting fiber integrity. Dosing is carefully monitored based on fabric weight and target brightness index.

    Industry compliance standards

    • OEKO-TEX® Standard 100 (textile chemical safety and residue limits)
    • ZDHC MRSL (Zero Discharge of Hazardous Chemicals Manufacturing Restricted Substances List)
    • ISO 105-X12 Textile Color Fastness Testing
    • EU Regulation (EC) No 1907/2006 (REACH) for chemical use in textile processing

    Typical usage ratio

    • 3–6 g/L during bleaching (batch operation); may be fine-tuned for fiber type and stain loading

    Downstream process integration

    • Added to bleaching float or dye bath after scouring and before final neutralization rinse

    Final product types

    • Bleached cotton and flax yarn
    • Whitened fabric rolls for garment production
    • Purified synthetic dye intermediates

    4. Pharmaceutical API Purification

    Producers of active pharmaceutical ingredients utilize oxalic acid dihydrate for critical purification steps, particularly in separating impurity complexes from intermediate reaction mixtures. Its selectivity for multivalent metal ions ensures removal of heavy metal residuals, aligning with stringent allowable limits for regulatory filings. Integration requires precise control of batch timing and temperature within validated SOPs, and all incoming batches undergo full trace metal and bioburden testing.

    Industry compliance standards

    • ICH Q7A Good Manufacturing Practice (GMP) for Active Pharmaceutical Ingredients
    • USP/Ph. Eur. limits for heavy metal residues in APIs
    • FDA 21 CFR Part 211 (Finished Pharmaceutical cGMPs)
    • Chinese Pharmacopoeia (ChP) for export APIs

    Typical usage ratio

    • 0.5–3% w/v solution for impurity precipitation; process chemists optimize based on API structure and initial impurity loading

    Downstream process integration

    • Integrated post-synthesis in purification and crystallization steps, followed by filtration and extensive washing

    Final product types

    • Crystalline APIs for formulation (e.g., antibiotics, antipyretics)
    • High-purity pharmaceutical intermediates

    5. Electronic Grade Chemicals – Ultrapure Reagents for Semiconductor Fabrication

    Oxalic acid dihydrate is specified by electronics manufacturers as a low-residue etchant and complexant for both cleaning and surface modification steps during semiconductor wafer processing. Procurement requires demonstration of ultra-low metallic impurities and micro-particulate count documented by third-party accredited labs. Process engineers dose according to specific etch-rate targets to support yield in advanced photolithography and wet cleaning stations.

    Industry compliance standards

    • SEMI C1, C35, and C93 (semiconductor chemical purity standards)
    • ISO 14644 Cleanroom Standards
    • IEC 61340 (ESD Control for Cleanrooms)
    • Customer-specific material qualification protocols for advanced nodes

    Typical usage ratio

    • 0.1–2% w/w in ultrapure water, titrated according to wafer type and process step—sub-ppm residue targets enforced

    Downstream process integration

    • Pumped into clean-in-place (CIP) and wet bench etching modules following mechanical planarization or before photolithography

    Final product types

    • Processed silicon and compound semiconductor wafers
    • Microelectronic components with critical surface requirements

    6. Leather Processing – Tanning and Finishing

    Commercial tanneries include oxalic acid dihydrate in pickling and neutralization formulas to remove residual lime and iron stains from hides before and after chrome tanning. This acid ensures uniform penetration and surface texture, supporting efficient tanning and consistent coloration without compromising leather grain. Technicians regulate addition relative to hide thickness and brine content to avoid over-softening.

    Industry compliance standards

    • ISO 5398-1 Leather—Chemical determination for preservatives
    • EU REACH compliance for leather processing chemicals
    • Leather Working Group environmental audit criteria
    • Integrated Pollution Prevention and Control (IPPC) Best Available Techniques Reference Document (BREF) for tanning

    Typical usage ratio

    • 0.5–2% w/w solution, calculated based on lime-residual analysis and hide species; adjusted by automatic dosing systems

    Downstream process integration

    • Added to pickling drum after liming and fleshing, and occasionally as pre-tanning rinse

    Final product types

    • Chrome-tanned leather
    • Vegetable-tanned leather with enhanced appearance
    • Specialty leathers for footwear, upholstery, and automotive interiors
    Free Quote

    Competitive Oxalic Acid Dihydrate prices that fit your budget—flexible terms and customized quotes for every order.

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    Email: admin@sinochem-nanjing.com

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    Certification & Compliance
    More Introduction

    Oxalic Acid Dihydrate: Reliable Chemistry for Real-World Applications

    The Foundation Behind Our Oxalic Acid Dihydrate

    Oxalic Acid Dihydrate may not draw the spotlight outside industry circles, but for those of us manufacturing chemicals every day, it is clear how this product shapes hundreds of processes quietly and efficiently. Our model—produced right in our facility—meets the tough demands set by years of handling, refining, and careful control. Each lot carries a consistent crystalline form, recognized easily by its pure white appearance and clean flow.

    For our operation, stability and purity in chemicals aren’t marketing points. They’re non-negotiables. Each kilogram leaving our factory floor averages a purity level above 99.6%, meeting or surpassing commonly referenced chemical standards. Solutions dissolve cleanly, contamination remains at bay, and unwanted side reactions drop dramatically—results proven out in tanneries, metal cleaning shops, and laboratories that depend on a steady supply.

    Key Specifications Openly Stated

    Specialists working with oxalic acid dihydrate watch for proper hydration and grade. We maintain the dihydrate form for a reason: its chemical composition (COOH)₂·2H₂O underpins predictable performance in real-world conditions, as only this hydrated state delivers reliable solubility profiles and easy handling. We frequently supply packaging in 25kg polypropylene-lined bags, balancing safety with field-proven durability for transport and storage.

    Crystal size, dust levels, and moisture content—every one checked, logged, and continuously improved in direct response to factory bottlenecks and feedback from end users. This has guided us away from generic blends and toward a product that handles well on automated lines and dissolves readily for all scales of aqueous application.

    Someone Has to Make It Right: Meeting Real Manufacturing Demands

    Some in the field treat oxalic acid dihydrate as a commodity—but having mixed, dried, and sifted through batch after batch on our production floor, we know what cuts through in practice. Impurities from unrefined raw materials show up fast during application. From our experience, iron content creeping above trace levels causes brownish solutions or staining in leather finishing. Unchecked sulfates throw off precise formulation balance where large-batch cleaning or chemical synthesis happens.

    In our facility, every process step—crystallization, filtration, drying, packaging—uses constant in-line checks, not just one-off spot tests. Downtime happens if inconsistencies are found, because after two decades, we know end users rely on our product performing the same in February as it did last July. Mistakes waste resources, but more than that, unexpected outcomes carry real cost for our partners.

    Standing Apart from Other Oxalic Acid Forms

    We manufacture only the dihydrate form—not the anhydrous or mixed hydrates sometimes sold by others. This choice isn’t about simplicity. In our own acid pickling operations, the anhydrous form has proven less stable and trickier to weigh accurately thanks to its higher reactivity and tendency to absorb atmospheric moisture. We also steer clear of cheaper blends that combine technical-grade with industrial or agricultural grades. Mixed grades often fluctuate in particle size, carry up unwanted heavy metals, and have unpredictable solubility, all of which can throw off formulation where tight controls matter.

    For metal passivation, textile bleaching, or rare earth extraction, the consistency of our dihydrate product means a familiar reaction every time. The hydrated form’s solubility gives better predictability in both small laboratory glassware and industrial reactors. Having stuck with this grade year after year, we notice fewer issues with caking or performance loss during long-term storage.

    Real-World Applications, Real-World Stakes

    Oxalic Acid Dihydrate often flies under the radar, but it is at the heart of de-rusting processes for stainless and carbon steel, removing iron oxide without damaging the base metal. We supply to factories that clean out heat exchangers, pipelines, or machine tools. Their maintenance teams value strong, clean action—no lingering residues from byproducts that would otherwise demand extra rinsing steps.

    The product also plays a major role for tanners and leather finishers. We have worked directly with workshop managers facing dull or stained hides after chrome tanning. Switching to our high-purity dihydrate, they get purified, brighter finishes thanks to the acid’s ability to strip away iron contamination. Better results mean fewer reworks, and better utilization of raw hides.

    Stone and tile restoration contractors rely on the acid’s ability to brighten dulled stone—especially marble—without introducing sulfates or insoluble residues. We hear from professionals cleaning historical sites who find that lesser grades with metallic contamination leave behind shadow stains or dark spots that can be hard to remove. With carefully controlled iron and ash content, our dihydrate outperforms cheaper alternatives in these sensitive projects.

    Many smaller buyers, ranging from schools to specialty labs, use oxalic acid dihydrate for analytical chemistry. In our own facility, we calibrate titrations and clean glassware because even slight impurities show up as background noise in precise tests. A flaky or dusty sample creates errors in volumetric analysis. That is why we always test for clarity in solution, as clarity gives a direct measure of purity and free-flowing granules.

    Consistent Quality—Not Just for Big Buyers

    We believe a chemical only proves its worth in the hands of someone using it daily. Whether sent to a processing plant or a university, our product reflects a commitment to reliability and transparency. We back this with regular third-party analyses—copies available without red tape upon request. These third-party results help us stay honest and make it easier for our customers to validate claims.

    Experiencing direct feedback loops has shaped our production. Customers handling dust-sensitive production tell us if their packs generate airborne particles; this steers us to further refine our granulation methods and raise the standard. Labs demanding ultra-pure results in research contexts prompt us to invest in new filtration systems or make minute tweaks to temperature controls during crystallization.

    We scale without cutting corners. Sometimes this means pausing a line to track down a strange reading in a moisture meter or sending extra samples to our in-house lab. Any problem we find becomes an incentive to dig deeper rather than paper over the results. It is through solving these challenges day in and day out that we keep our product clear, clean, and consistent for the next round of users.

    Addressing Challenging Realities in Chemical Supply

    Working in chemical manufacturing brings constant reminders that quality and safety overlap every step. Adulteration and fraudulent labeling remain issues in secondary markets and shadow supply chains. We have had incoming raw materials flagged for being off-spec more times than anyone would like to admit. Third-party traders might shave corners, but as the manufacturer, every defect lands back on our doorstep—not a middleman’s.

    We see the costs when factories receive off-grade product: extra machine downtime, failed batches, or fouled cleaning tanks. Our keeping detailed production logs comes not from routine but necessity, as we have answered too many phone calls from buyers burned by substandard supply chains. Correcting for errors after the fact is costly and sometimes irreversible. That is why we put forward the data to support every batch and remain transparent about our internal rejections.

    Driving Raw Material and Energy Efficiency

    One of our ongoing challenges lies in managing tight supply of raw formic and nitric acids required for the synthesis of oxalic acid. Global fluctuations can shut down plants thousands of kilometers away, sending ripples across the entire industry. Recognizing this, we started developing relationships with upstream suppliers to guard against missing deliveries. Several times, those relationships kept our factory running when others stalled out by waiting for uptake from traders.

    Our production team invested in closed-loop systems to recover energy from hot process streams. Not only does this cut costs in heating, but it keeps environmental discharge minimal—a growing concern as governments tighten the screws on chemical waste. Regular audits check for leaks, energy imbalances, and irregularities in feedrates. All this feeds directly into the end result: a more reliable, less variable product.

    Reduction of Unwanted Byproducts — Addressing Environmental and Operational Impact

    Waste minimization stands as a reality we face at the factory gate. Every kilo of oxalic acid dihydrate produced generates residual mother liquor and filtering cake. For years, much of this would go straight to neutralization. We have since redirected those streams for partial recovery, using byproducts as precursors in other chemical syntheses, especially where low-grade forms still offer utility in agricultural or water treatment applications.

    Adopting inline monitoring, we catch batch anomalies faster and redirect nonconforming product for reprocessing rather than disposal. Our waste reduction rate continues to climb—important not only for profit but for community assurance. Regulatory scrutiny has only sharpened over the past decade; operating more cleanly and openly keeps us part of the solution, not just the supply chain.

    Practical Safety Built In

    Handling any strong acid, even one as ‘mild’ as oxalic acid dihydrate, takes respect. We learned early on—through the hard lessons of minor spills and skin irritation—that proactive training saves more trouble than the best equipment. All staff undergo regular revisions of our handling protocols, and we track near-misses to spot recurring weak points. Repack operations run under strict local extraction and gloves aren’t optional.

    We fit our warehouse space with interlocked ventilation and keep spill cleanup kits at arm’s reach. By documenting incidents and acting swiftly—even for seemingly small issues—we avoid escalation and keep injury statistics at a stubbornly low level. This attention to process details matters just as much to our customers as to our team: cleaner, safer handling in the factory means a more trustworthy product end to end.

    Continuous Improvement Means Listening

    Our company doesn’t bend to every trend or follow every standard for the sake of certifications, but we do set goals based on recurring real-world feedback. In one recent season, requests came in for lower-dust, low-caking granules suited to automated dispensing. We responded by investing in a new cooling system for the drying stage and refining the crystallization parameters to grow a more uniform product, lowering fines by nearly 20%.

    Not every batch runs at textbook perfection. Any seasoned chemical manufacturer knows reality never follows the brochure. We review each customer complaint as a learning opportunity. If a load arrives damp or stained, we gather full traceability on the affected serials, run the post-mortem, and publish internal findings for our team. If it’s a packaging issue, we step back to test alternatives, adjusting not just for cost but for on-site usability.

    Accessibility in a Volatile Market

    Over the last few years, the chemical industry has seen price swings and supply gaps clear as day. Every one of these disruptions tests how prepared you are to support end users. We never hedge on the practice of keeping critical stock on hand, stored well within optimal conditions—dry, secure, temperature-stabilized. It burdens cash flow, but it means users never wait weeks for essential cleaning or finishing operations.

    We do not push unused technical grades onto buyers when production runs lean. Instead, we maintain open dialogue and honest scheduling to allocate finished product according to real need, especially when critical industries—like pharmaceuticals or electronics—require uninterrupted supply against firm delivery dates.

    Differences That Matter

    Oxalic acid dihydrate produced in our factory represents the point where experience meets discipline. Compared to generic grades from traders or bulk blenders, our product owes its reliability to strict input screening, batch logs stretching back years, and willingness to miss a ship date to keep quality where it belongs. No upgraded spec or rebranding tricks—just steady, repeatable chemistry.

    End users tell us time and again where lesser grades fail: excess metallic taste in drinking water treatment, unexpected discoloration on textiles, increased cleaning times for machinery, lost yield in precious metal processing. We follow up on every application report, visit worksites when needed, and take direct feedback from engineers who have fixed mixers clogged with subpar acid dust or product sticky from moisture pickup.

    Packaging gets the same scrutiny. We ship using tightly sealed, tear-resistant bags, with secondary liners for extended storage. Customers confirm product holds up in high-humidity or monsoon conditions—critical where oxidizable goods can lose function or attract pests if poorly packed.

    The Role of Transparency and Trust in Chemical Manufacturing

    For our team, trust is built batch by batch. Open disclosure of test results, readiness to recall or correct, and genuine curiosity about operator pain points have brought long-term partners to the table. End users achieving trouble-free runs share news with others, and negative experiences with competitors often bring someone new to our door. This feedback loop fuels us more than price competition.

    We recognize scrutiny increases each year: downstream industries value traceability; regulators request faster, clearer documentation. We’ve deliberately invested in digital batch records and linked laboratory analyses—not just because compliance demands it, but because it means anyone receiving our product can match a bag or drum straight to its origin story.

    Where We Go From Here

    Producing oxalic acid dihydrate isn’t glamorous, but for us, it remains a core example of how paying attention to the details brings repeat business, real safety, and ongoing improvement. Each day on the plant floor brings new lessons—sometimes in troubleshooting equipment, sometimes in responding to new environmental standards, always with the next customer requirement in mind.

    We do not chase after every passing trend or cut corners for short-term gain. Steadily refining our process, training up our team, and staying responsive to field realities carry us forward. In every shipment, large or small, we see more than just another order: we see proof that careful, accountable manufacturing—of oxalic acid dihydrate or any chemical—can set the standard others are forced to follow.