SAFETY DATA SHEET OXALIC ACID, DIHYDRATE REVISION 6, DATE 25 MAY 2022

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Oxalic Acid Dihydrate

Overview
Oxalic Acid Dihydrate (C₂H₂O₄·2H₂O)

- Chemical Name: Oxalic acid, dihydrate
- Chemical Formula: C₂H₂O₄·2H₂O
- Chemical Family: Ethanedioic acid, dihydrate
- CAS Number: 6153-56-6
- Appearance: White or uncoloured crystals or powder
- Odour: Odourless
- Solubility: 108 g/L in water at 25°C
- pH: ~0.7 (50 g/L solution)
- Melting/Boiling Point: Sublimes at >160°C
- Auto-Ignition Temperature: ≥400°C
- Flash Point: Not available
- Density: Not available
- Vapour Pressure: 0.0312 Pa (@ 25 °C)
- Partition Coefficient: -1.7 (23 °C)

Safety and Handling
Hazard Classification
- Acute Toxicity (Oral): Category 4
- Acute Toxicity (Dermal): Category 4
- Serious Eye Damage/Irritation: Category 1

Signal Word: Danger
Hazard Statements:
- H302: Harmful if swallowed
- H312: Harmful in contact with skin
- H318: Causes serious eye damage

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Precautionary Statements
- P270: Do not eat, drink or smoke when using this product
- P280: Wear protective gloves/protective clothing/eye protection/face protection
- P312: Call a POISON CENTER or doctor if you feel unwell
- P330: Rinse mouth
- P302 + P352: IF ON SKIN: Wash with plenty of water
- P305 + P351 + P338 + P310: IF IN EYES: Rinse cautiously. Remove contact lenses if present. Continue rinsing and immediately call a POISON CENTRE or doctor
- P362 + P364: Take off contaminated clothing and wash before reuse
- P501: Dispose of contents/container in accordance with regulations

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Handling and Storage
- Ensure adequate ventilation and use personal protective equipment
- Avoid generating dust, ingestion, and contact with eyes/skin
- Store in a cool, dry and well-ventilated place
- Avoid exposure to air and moisture (hygroscopic)
- Keep away from heat, ignition sources, food, and incompatible materials

First Aid Measures
Swallowed: Rinse mouth, drink water, do not induce vomiting. Seek medical advice.
Inhaled: Move to fresh air and rest. Seek medical advice.
Eye Contact: Rinse cautiously with water for at least 15 minutes. Remove contact lenses. Seek immediate medical help.
Skin Contact: Remove contaminated clothing. Wash with running water for 15 minutes. Seek medical advice.
Advice to Doctor: Treat symptomatically. Ensure medical personnel are aware of the substance and take precautions.

Fire Fighting Measures
- Use dry chemical, CO₂, foam or water spray
- Avoid dust dispersion which can cause dust explosion hazard
- Fire may release carbon monoxide, carbon dioxide, and formic acid
- Firefighters should use self-contained breathing apparatus and full protective gear
- Cool containers with water spray

Accidental Release Measures
- Ensure ventilation and eliminate ignition sources
- Avoid dust generation and contact with skin/eyes
- Collect dry material and store in waste containers
- Prevent entry into drains or watercourses
- Evacuate area if necessary
- Wear appropriate PPE

Toxicological Information
- Harmful if swallowed or in contact with skin
- Causes serious eye damage
- May cause nausea, vomiting, headaches, abdominal pain, diarrhoea, numbness, and more
- Not irritating to skin in rabbit studies
- Not considered a skin sensitiser or carcinogenic
- May cause kidney damage and other cumulative effects with repeated exposure

Transport and Regulatory
Transport Classification: Not classified as Dangerous Goods under road, sea, or air transport standards
Regulatory Information:
- Listed on national inventories including Australia (AIIC), USA (TSCA), EU (EINECS), Japan (ENCS), and others
- Approved in NZ under HSR002503 – Additives Process Chemicals and Raw Materials Group Standard 2020
- Poisons Schedule (Aust): Schedule 6

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