Oxalic Acid
| Formula: | C₂H₂O₄ |
| CAS Number: | 144-62-7 (anhydrous), 6153-56-6 (dihydrate) |
| EC Number (EINECS): | 205-634-3 |
| HS Code: | 29171110 |
| UN Number: | 3261 (for solid, dihydrate form – corrosive solid) |
| IUPAC Name: | Ethanedioic Acid |
| Also Known As: | Ethane-1,2-dioic Acid; Oxalate |
| Molecular Weight, g/mol: | 90.03 (anhydrous), 126.07 (dihydrate) |
Typical Specifications
| Appearance: | White crystalline solid |
| Odor: | Odorless |
| Melting Point, °C: | 101–102 (dihydrate, decomposition) |
| Boiling Point, °C: | Decomposes before boiling |
| Flash Point, °C: | Not applicable (non-volatile solid) |
| pH (1% solution): | ~1.3 |
| Purity, %: | ≥99.5 |
| Grades Available: | Industrial, Laboratory, Food/Pharma Grade |
| Packaging: | 25kg bags, 50kg drums, jumbo bags |
Applications / Uses
Primary Applications
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Cleaning and bleaching agent in textile and leather industries
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Precipitant in rare earth element separation and metal purification
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Used in rust removal and surface treatment of metals
Secondary Applications
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Intermediate in dyes, pharmaceuticals, and specialty chemicals
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Laboratory reagent for analysis and synthesis
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Used in wood bleaching and marble polishing
End Industries Served: Chemicals, Pharmaceuticals, Textiles, Leather, Metal Processing, Cleaning & Detergents, Construction
Safety & Handling Information
Hazard Class (GHS): Acute Toxicity (Oral – Category 4), Skin Corrosive (Category 1B), Eye Damage (Category 1)
Hazard Statements (H-Codes):
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H302: Harmful if swallowed
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H314: Causes severe skin burns and eye damage
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H318: Causes serious eye damage
Precautionary Statements (P-Codes):
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P280: Wear protective gloves/eye protection
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P301 + P330 + P331: IF SWALLOWED – rinse mouth, do not induce vomiting
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P305 + P351 + P338: IF IN EYES – rinse cautiously with water for several minutes, remove lenses
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P310: Immediately call a POISON CENTER or doctor
Storage Conditions
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Store in tightly closed containers in cool, dry, well-ventilated area
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Protect from moisture and incompatible materials (alkalis, oxidizers)
Transport Information
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ADR/RID: Class 8, UN3261, PG III
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IMDG: Class 8, UN3261, PG III
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IATA: Class 8, UN3261, PG III