© 2026 Nanjing Finechem Holdings Co., Ltd,
All Right Reserved
Product Name: Oxalic Acid Dihydrate
Chemical Formula: C2H2O4 · 2H2O
Synonyms: Ethanedioic acid, Dihydrate oxalate
CAS Number: 6153-56-6
EC Number: 205-634-3
Recommended Use: Laboratory chemical, cleaning agent, bleaching, rust removal
Supplier Information: List the input supplier, address, emergency contact phone
Emergency Telephone: Emergency response number, available 24 hours
Classification: Acute Toxicity – Oral (Category 4), Acute Toxicity – Dermal (Category 4), Eye Damage/Irritation (Category 1), Skin Corrosion/Irritation (Category 1B)
Label Elements: Signal Word: Danger, Hazard pictograms: Skull & Crossbones, Corrosive
Hazard Statements: Harmful if swallowed, Toxic in contact with skin or inhaled, Causes serious eye irritation and burns, Can cause kidney damage, Increases fire risk if mixed with combustibles
Precautionary Statements: Avoid contact with eyes, skin, and clothing; do not breathe dust, wear protective gloves and eyewear, wash hands thoroughly after handling, seek medical help if exposed
Routes of Exposure: Ingestion, skin contact, eye contact, inhalation of dust or vapor
Symptoms: Burning pain, redness, coughing, difficulty breathing, vomiting, possible kidney effects
Target Organs: Kidneys, gastrointestinal tract
Chemical Name: Oxalic Acid Dihydrate
CAS Number: 6153-56-6
Concentration: 99% or higher
Other Components: Product contains only oxalic acid and water of hydration, no significant impurities
Inhalation: Move person to fresh air, keep at rest, get medical attention for breathing difficulty, provide resuscitation if breathing stops
Skin Contact: Remove contaminated clothing, flush all affected skin with water for at least 15 minutes, wash with soap and water, seek medical help for persistent irritation or burns
Eye Contact: Rinse with gentle stream of water for at least 15 minutes, lifting eyelids to clean thoroughly, remove contact lenses, seek immediate medical assistance
Ingestion: Do not induce vomiting, rinse mouth with water, give milk or water to dilute if person is able to swallow, get prompt medical attention; risk of kidney or metabolic problems
Notes to Physician: Monitor for systemic toxicity and kidney function, treat symptoms, consider prompt removal by gastric lavage if large quantity swallowed
Suitable Extinguishing Media: Use water spray, carbon dioxide, dry chemical, or foam on fires involving this material
Specific Hazards: Releases toxic fumes of carbon monoxide and carbon dioxide when heated or burned, may react with metals to produce flammable hydrogen gas
Protective Equipment for Fire-Fighters: Wear self-contained breathing apparatus and full protective clothing, avoid breathing fumes
Explosion Data: Product itself is not explosive, but may intensify fire through release of fumes
Other Information: Cool endangered containers with water, exert caution when approaching stored product during fire
Personal Precautions: Wear acid-resistant gloves, eye protection, and dust mask or appropriate respirator, evacuate unprotected personnel
Environmental Precautions: Prevent spillage from entering sewers, drains, watercourses, or soil
Methods for Cleanup: Sweep up solid product using methods that minimize dust, collect in container for disposal, flush spill area with large amount of water, ventilate the area sufficiently
Disposal of Collected Material: Place in sealed, labeled containers for disposal as chemical waste
Handling: Keep containers tightly closed and upright, use in well-ventilated areas, avoid contact with skin, eyes, and clothing, avoid inhaling dust or particles, equipment and work surfaces should be acid-resistant
Storage: Store in a cool, dry, well-ventilated area, away from incompatible materials such as oxidizers, metal powders, bases, reducing agents, store in corrosion-resistant container, keep away from direct sunlight, strong heat sources, store at room temperature, ensure containers are clearly labeled
Special Precautions: Keep storage area locked or restricted to trained personnel
Exposure Limits: OSHA PEL: 1 mg/m3 (TWA), ACGIH TLV: 1 mg/m3 (TWA)
Engineering Controls: Use local exhaust or process enclosure to minimize worker exposure, maintain eye wash stations and safety showers near handling areas
Personal Protection: Wear impervious gloves (such as nitrile or rubber), chemical safety goggles or face shield, protective clothing to avoid skin contact, recommended use of a dust mask or respirator approved for acid mists/dusts, do not eat, drink, or smoke during use, wash hands thoroughly before eating or drinking
Hygiene Measures: Promptly remove contaminated clothing, launder before reuse
Appearance: Colorless, transparent crystals
Physical State: Solid
Odor: Odorless
Melting Point: 101°C (decomposes)
Boiling Point: Not applicable (decomposes)
Density: 1.653 g/cm3 at 20°C
Solubility: Readily soluble in water, soluble in alcohol and ether
pH: Approx. 1.3 (5% solution)
Vapor Pressure: Negligible at room temperature
Flash Point: Not flammable
Evaporation Rate: Not applicable
Partition Coefficient: Log Pow: -1.7 (estimated)
Auto-Ignition Temperature: Not self-igniting
Chemical Stability: Stable under recommended storage conditions
Incompatible Materials: Strong oxidizers, strong bases, metal powders, hypochlorite, strong reducing agents, chlorites
Decomposition Products: Carbon monoxide, carbon dioxide, formic acid when heated
Hazardous Reactions: Contact with metals generates hydrogen gas, can react vigorously with oxidizing substances
Conditions to Avoid: Moisture, excessive heat, contact with incompatible materials, open flames
Acute Toxicity: Oral LD50 (rat): 375 mg/kg, may cause pain, vomiting, diarrhea, shock if ingested
Dermal Toxicity: Can cause burns, redness, blistering, dermatitis through skin contact
Inhalation: Causes coughing, sore throat, shortness of breath, irritation of respiratory passages
Chronic Exposure: Prolonged or repeated exposure may cause kidney damage, blood disorders, bone damage
Carcinogenicity: No evidence of carcinogenicity per IARC, NTP, OSHA
Mutagenicity: No relevant data
Reproductive Effects: Limited data suggests reproductive toxicity possible from large exposures
Target Organs: Kidneys, blood, gastrointestinal system
Aquatic Toxicity: Harmful to aquatic organisms in concentrated quantities, LC50 (fish, 96 hr): approx. 160 mg/L
Persistence and Degradability: Readily biodegradable, oxalic acid occurs naturally in many plants
Bioaccumulative Potential: Low potential for bioaccumulation (log Pow is negative)
Mobility in Soil: Highly mobile in water, may leach into groundwater
Other Harmful Effects: In large spills, may locally lower pH and harm aquatic environments or plants
Disposal Methods: Dispose of in accordance with local, regional, and national regulations, small amounts may be diluted and neutralized before disposal, offer surplus and non-recyclable solutions to licensed disposal company
Contaminated Packaging: Empty containers must be triple-rinsed before recycling or disposal, dispose of as hazardous waste
Environmental Considerations: Avoid release to environment, prevent from entering drains, surface water, or groundwater
Special Instructions: Label waste containers appropriately, retain disposal documentation
UN Number: 3261
Proper Shipping Name: Corrosive Solid, Acidic, Organic, N.O.S. (contains Oxalic Acid Dihydrate)
Transport Hazard Class: 8 (Corrosive substances)
Packing Group: III
Marine Pollutant: Not regulated as marine pollutant under IMDG
DOT Label: Corrosive
Special Provisions: Protect containers from physical damage, keep separated from incompatible substances
Other Requirements: Emergency response procedures required in transport documentation
OSHA: Regulated as hazardous substance
SARA Title III: Not subject to the reporting requirements of sections 302, 304, 313 (USA), present in SARA 311/312 as acute health hazard
TSCA: Listed on the Toxic Substances Control Act inventory
REACH (Europe): Registered, subject to restrictions for some uses
Canadian DSL: Listed
WHMIS: Classified as D1A (Very Toxic), E (Corrosive Material)
Other National Regulations: Subject to chemical safety assessment and workplace labeling
Labeling Requirements: Corrosive warning, risk and safety phrases as applicable
