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Oxalic acid

Oxalic acid (ethanedioic acid) is an important organic dicarboxylic acid, renowned for its strong reducing properties and excellent complexing ability. It is widely used in rare earth extraction, metal surface treatment, textile printing and dyeing, pharmaceuticals, wastewater treatment, electronics, and daily chemical products.

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Product Description

In rare earth extraction, oxalic acid is a key precipitant for rare earth separation and purification, playing an irreplaceable role in the efficient extraction of rare earth elements. In metal surface treatment, it effectively removes rust and scale. In wastewater treatment, it effectively precipitates heavy metal ions. Products are available in industrial, refined, pharmaceutical, and analytical grade (AR)/superior grade (GR) grades, strictly adhering to the national standard GB/T 1626-2008. Small-batch trial orders and customized packaging are supported. Utilizing major ports such as Qingdao, Tianjin, and Shanghai, exports are efficient and hassle-free. As a Class 8 corrosive substance (UN3261), exports require a dangerous goods packaging certificate and MSDS, among other compliance documents.

Product Information

ItemDescription
Product NameOxalic Acid (Ethanedioic Acid)
CAS No.6153-56-6 (Dihydrate); 144-62-7 (Anhydrous)
EINECS No.205-634-3
Molecular FormulaH₂C₂O₄·2H₂O (Dihydrate); H₂C₂O₄ (Anhydrous)
Molecular Weight126.07 (Dihydrate); 90.03 (Anhydrous)
AppearanceWhite crystalline powder or colorless monoclinic crystals, odorless
Main TypesIndustrial Grade: Purity ≥99.0%-99.6%, for rare earth extraction, metal treatment, textile, wastewater treatment. Largest volume grade.
Refined/High Purity Grade: Purity ≥99.8%-99.9%, strict impurity control for electronic chemicals, fine chemical synthesis, high-purity reagents.
Pharmaceutical Grade: Purity ≥99.5%-99.9%, for pharmaceutical intermediates and API synthesis.
Analytical Reagent (AR) / Guaranteed Reagent (GR) : Purity ≥99.5%-99.9%, for laboratory analysis and reagent preparation.
Key Physical & Chemical PropertiesAppearance: White crystalline powder or colorless monoclinic crystals, odorless; Solubility: freely soluble in water (~9.5g/100mL at 20℃), soluble in ethanol, slightly soluble in ether; Density: 1.653 g/cm³ (dihydrate), 1.90 g/cm³ (anhydrous); Melting Point: 101-102℃ (dihydrate), decomposes at 189.5℃ (anhydrous); Boiling Point: 365.1℃ (decomposes); Aqueous solution acidic (pH~1.3 for 1% solution); Strong reducing agent; Forms stable oxalate complexes with calcium, magnesium, iron ions.
Typical SpecificationsAssay (H₂C₂O₄·2H₂O): Industrial ≥99.0%-99.6%, Refined ≥99.8%; Moisture: dihydrate theoretical 28.6%; Ash: ≤0.02%-0.05%; Chlorides (Cl): ≤0.002%-0.005%; Sulfates (SO₄): ≤0.002%-0.005%; Heavy Metals (as Pb): ≤0.001%; Iron (Fe): ≤0.001%; Calcium (Ca): ≤0.003%.
FeaturesStrong reducing agent; excellent chelating ability with calcium, magnesium, iron ions; effective bleaching and cleaning; moderate acidity; non-toxic but corrosive; requires safety protection during handling.
Main ApplicationsRare Earth Extraction (largest application) : Precipitation agent for rare earth elements (Ce, La, Nd, etc.) forming insoluble oxalate precipitates, calcined to high-purity rare earth oxides.
Metal Surface Treatment: Metal cleaning, rust removal, descaling, polishing; pickling and passivation for stainless steel, copper, aluminum.
Textile & Dyeing: Mordant, bleaching agent, fixing agent; removes iron stains from fabrics.
Pharmaceutical: Synthesis of pharmaceutical intermediates and APIs (sulfonamides, tetracyclines, barbiturates).
Wastewater Treatment: Heavy metal precipitation (lead, mercury, cadmium); electroplating wastewater treatment.
Electronics: Electronic component cleaning, semiconductor wafer processing, PCB etching and cleaning.
Household Chemicals: Toilet cleaners, descaling agents, metal polishers, stain removers.
Others: Leather tanning, stone cleaning, glass etching, electroplating, analytical reagents, organic synthesis, bleaching.
Packaging25kg woven bags (PE liner), 50kg bags; 500kg or 1000kg jumbo bags; custom packaging available.
Storage ConditionsStore in cool, dry, well-ventilated area; keep sealed to prevent moisture; avoid mixing with oxidizers and strong alkalis; away from heat sources.
Shipping RequirementsDangerous Goods Class 8 (Corrosive), UN 3261 (solid) or UN 2449 (solution), Packing Group III. Must be shipped according to dangerous goods regulations; provide Dangerous Goods Packaging Certificate and MSDS; protect from moisture and rain; do not mix with oxidizers, strong alkalis, or food products.
Quality StandardsChina: GB/T 1626-2008; Export reference: ISO 1018:1975, DIN 14668.


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FAQ

Q1: Is Huafeng Chemical a manufacturer or a trader?
A: We are a professional service provider specializing in chemical foreign trade. Rather than being limited to the products of a single factory, we leverage the chemical industry cluster in Shandong Province to integrate production resources from multiple high-quality manufacturers. This allows us to offer a wide range of sourcing options—covering various product categories and origins—instead of simply pushing a single product. Furthermore, our core competitiveness lies in our professional foreign trade services (covering documentation, logistics, and regulatory compliance), ensuring a smooth and worry-free procurement process for you.


Q2: How is the security of my transaction guaranteed when working with Huafeng Chemical?
A: We strictly adhere to international trade rules (Incoterms® 2020) and accept various payment methods, such as Letters of Credit (L/C) and Telegraphic Transfers (T/T). For new clients, we support small-batch trial orders and can clearly define arbitration clauses and applicable laws within the contract. Additionally, we maintain a robust risk management system to help you mitigate common trade risks, such as exchange rate fluctuations, shipping delays, and document discrepancies.


Q3: Do you have experience serving clients in Russian-speaking regions?
A: Yes. We place great importance on the Russian-speaking market; our team includes Russian-speaking business professionals who are well-versed in the import regulations of Russia and the Eurasian Economic Union (EAEU). We understand the importance of EAC certification to clients in these regions and can assist with related compliance inquiries. We have established connections with chemical traders across various CIS countries and have gained valuable experience in specialized packaging and temperature-controlled shipping designed to withstand harsh local winter conditions.


Q4: How do you guarantee product quality?
A: We implement a strict supplier qualification and periodic audit system. A Certificate of Analysis (COA)—issued by the original manufacturer—is provided with every shipment. We also welcome pre-shipment inspections conducted by internationally recognized third-party agencies such as SGS, BV, or ITS. Should the test results fail to meet the standards specified in the contract, you have the right to reject the goods or request a replacement.

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