Oxalic Acid is a strong dicarboxylic acid occurring naturally in many plants. It is widely used in industrial applications, particularly as a cleaning agent, chelating agent, and chemical intermediate.
Oxalic Acid CAS 144-62-7
Description
- CAS: 144-62-7 (Anhydrous)
- Synonyms: Ethanedioic acid; Wood bleach; Dicarboxylic acid
- Einecs: 205-634-3
- Molecular Formula: C_2H_2O_4
- Grade: Industrial Grade, Reagent Grade, Pharmaceutical Grade
- Package: As required
Details
Basic
Basic Properties: Oxalic acid is the simplest dicarboxylic acid. It appears as a colorless, crystalline organic compound that forms a colorless solution in water. It is a highly potent reducing agent and is significantly stronger than acetic acid.
Common Chemical Reactions:
- Chelation (Complexation): Reacts with metal ions (like iron) to form water-soluble complex salts.
- Oxidation: As a strong reducing agent, it is easily oxidized by strong oxidizing agents like potassium permanganate (KMnO_4), breaking down into carbon dioxide and water.
- Esterification: Reacts with alcohols in the presence of an acid catalyst to form dialkyl oxalates.
Specifications
| Parameter | Specification |
|---|---|
| Appearance | White crystalline powder |
| Assay (Purity) | ≥ 99.6% |
| Melting Point | ~189.5 °C (sublimes) |
| Volatility | Low volatility at room temperature; sublimes upon heating |
| Ash Content | ≤ 0.1% |
| Solubility | Soluble in water (143 g/L at 25℃) and ethanol |
| Thermal Stability | Decomposes into carbon monoxide (CO), carbon dioxide (CO_2), and water (H_2O) when heated strongly above its melting point. |
Data Sheet Download
Applications
- Surface Cleaning & Rust Removal: Acts as a chelating agent. It binds with insoluble iron compounds (rust) and converts them into water-soluble iron oxalates, which can be easily washed away.
- Wood Bleaching: Acts as a reducing agent and chelator. It removes black water stains, iron stains, and weathering from wood surfaces, restoring the natural wood color without damaging the fiber.
- Metallurgy & Rare Earth Processing: Acts as a precipitating agent. Used to precipitate and separate rare earth metals from aqueous solutions during mineral processing.
- Textile & Leather Industry: Acts as a mordant and bleaching agent. Helps fix dyes to fabrics and removes metal impurities during leather tanning.
- Chemical Synthesis: Acts as a raw material/intermediate. Used in the synthesis of oxalates, plastics, dyes, and pharmaceutical ingredients.
Storage Environmental Requirements
- Environment: Store in a cool, dry, and well-ventilated area.
- Moisture Control: Keep containers tightly closed to protect from moisture, as the powder can cake when exposed to high humidity.
- Incompatibilities: Segregate from strong oxidizing agents, strong bases (alkalis), and silver compounds.
- Sunlight: Keep away from direct, prolonged exposure to sunlight and heat sources.
Handling and Usage Precautions
- Personal Protective Equipment (PPE): Always wear chemical-resistant gloves, safety goggles, and protective clothing. Use a NIOSH-approved dust mask or respirator if dust is generated.
- Ventilation: Use only in well-ventilated areas or under a chemical fume hood to avoid inhaling dust or vapors.
- Skin/Eye Contact: Corrosive. In case of contact, immediately flush eyes or skin with plenty of water for at least 15 minutes. Seek medical attention.
- Ingestion: Highly toxic if swallowed. Do not eat, drink, or smoke while handling this product. Wash hands thoroughly after use.
Formulations
5-10% Oxalic Acid dissolved in water, often with a mild surfactant.
Oxalic acid acts as the primary active ingredient to lift tannin stains and iron marks, while the surfactant helps wet the wood surface for deeper penetration.
Aqueous solution containing Oxalic Acid, citric acid, and detergents.
Acts as a targeted chelator to dissolve brake dust (metallic iron particles) and rust spots on clear-coated wheels without scratching the surface.
Oxalic acid mixed with sugar syrup (dribble method) or used purely as a vapor (sublimation).
Acts as a highly effective, natural miticide to protect honeybee colonies from Varroa destructor mites.
Packaging
- Standard Packaging: 25 kg woven plastic bags with a PE (polyethylene) inner liner to prevent moisture ingress.
- Bulk Packaging: 1000 kg Jumbo bags (FIBCs) with inner PE liners for large-scale industrial consumers.
- Custom Packaging: Available in custom drum or bucket sizes as required by the client.
- Palletizing: Shrink-wrapped on wooden or plastic pallets for safe transport.




Safety and Compliance
| Compliance / Safety Item | Status / Details |
|---|---|
| SDS / MSDS | Available Upon Request |
| GHS Classification | Acute Tox. 4 (Oral & Dermal); Eye Dam. 1 |
| UN No. | UN 3261 (Corrosive solid, acidic, organic, n.o.s.) |
| Transport Class | Class 8 (Corrosive Substances) |
| Hazard Statements | H302: Harmful if swallowedH312: Harmful in contact with skinH318: Causes serious eye damage |
| Labeling and Packaging Compliance | Fully complies with GHS and standard international shipping labeling regulations. |
| COA / TDS | Available Upon Request for every batch |
| Batch Traceability | 100% Traceable via lot numbering system |
FAQ
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Q: How to get more information about the product?A: You can contact us via email at info@zhpmchem.com or WhatsApp at +8618321309391 for more information about our products and company.
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Q: Does the product meet our requirements regarding formulation, equipment, and processing?A: Yes, we will adjust the product formulation to your specific needs, ensuring it meets your processing requirements.
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Q: Why is Oxalic Acid specifically chosen for rust removal over other acids?A: Unlike hydrochloric or sulfuric acid, which simply dissolve the metal, oxalic acid acts as a chelator. It chemically binds to iron ions to form a water-soluble complex (ferrioxalate) that can be rinsed away easily, removing the rust without aggressively eating into the base metal underneath.
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Q: Can Oxalic Acid be mixed with household bleach?A: No. Oxalic acid should never be mixed with chlorine bleach (sodium hypochlorite) or any strong oxidizers. Mixing them can result in dangerous, toxic gas releases and hazardous chemical reactions.
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Q: Does Oxalic Acid have a shelf life?A: When stored properly in a tightly sealed container in a cool, dry place, Oxalic Acid is highly stable and generally has a shelf life of 2 to 3 years. Exposure to high humidity may cause the powder to clump, but it usually does not degrade its chemical effectiveness.
