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Oxalic acid

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Oxalic acid is often used to remove limescale and rust. It is a versatile product that is used for many applications.



What is oxalic acid?

Oxalic acid is an organic compound, chemically known as a dicarboxylic acid with the formula C₂H₂O₄. In its pure form it is a white crystalline powder and has many different uses.

In the textile and leather industries it is used for bleaching and cleaning processes. It is also an important ingredient in certain household cleaners, especially for its ability to effectively remove rust and restore weathered wood. In the metalworking industry it is used to prepare and clean metal surfaces. The substance also plays a role in laboratory chemistry, where it is used in analytical processes and as a reagent.

Despite these beneficial uses, oxalic acid should be handled with care as it can be irritating to the skin and eyes. It is essential to follow proper safety protocols when handling technical grade oxalic acid, such as wearing appropriate protective clothing and using in well-ventilated areas.

Uses of oxalic acid

  • Rust removal: Oxalic acid can be used to remove rust from various surfaces.
  • Wood bleach: It helps in lightening stains of wood.
  • Cleaning: It removes limescale and other stubborn stains from textiles and other surfaces.
  • Metalwork: Used in aluminum production and for etching iron.

Instructions for making dewatering water

  1. Solution Preparation : Dissolve 100 grams in 1 liter of warm water. This provides an effective concentration for treating discolorations.
  2. Application : Apply the oxalic acid solution to the discolored area and allow it to absorb. This can be repeated until the discoloration disappears.
  3. Treatment of the Entire Surface : After removing the discoloration, treat the entire surface with the solution, not just the previously treated area. This helps in evenly restoring the appearance of the surface.
  4. Rinsing : Rinse the treated surface thoroughly with clean water. This is essential to remove residues of oxalic acid and to neutralize the acid.
  5. Safety measures : The use of personal protective equipment, such as gloves and goggles, is strongly recommended to prevent skin and eye irritation.
  6. Other Considerations : Inform users that it is important to work in a well-ventilated area and to avoid direct contact with the skin and eyes.

Health and Safety

Oxalic acid, while useful in many applications, carries significant risks when used incorrectly. It is poisonous if ingested and causes irritation on contact with skin and eyes. This emphasizes the importance of wearing protective clothing, such as gloves and goggles, while handling oxalic acid.

Inhalation of fumes can also cause breathing problems. In case of direct exposure or accidents, seek immediate medical attention.

In industrial settings, it is essential to strictly follow safety protocols, including adequate ventilation and emergency procedures.

It is also important to be aware that foods with high concentrations of oxalic acid, such as certain vegetables and nuts, can contribute to the formation of kidney stones if consumed in excess.

When working with oxalic acid, it is important to observe both industrial and personal safety.


GHS symbol for corrosive. GHS symbol for irritant.

Hazard statements (H phrases)

  • H302: Harmful if swallowed
  • H312: Harmful in contact with skin.
  • H318: Causes serious eye damage

Precautionary measures (P-phrases)

  • P264: Wash hands thoroughly after use.
  • P280: Wear protective gloves, protective clothing, eye protection, face protection.
  • First-aid measures after ingestion (P301+P312): If you feel unwell after swallowing: Call a POISON CENTER or doctor/physician.
  • First aid after skin contact (P302+P352): In case of contact with skin: wash immediately with plenty of soap and water.
  • First aid after eye contact (P305+P351+P338): In case of contact with eyes: rinse carefully with water for several minutes; remove contact lenses, if possible; keep rinsing.
  • P362+P364: Remove contaminated clothing and wash before reuse.

Frequently Asked Questions

  • Is oxalic acid dangerous?
    • Yes, it is toxic if ingested and can cause irritation on contact.
  • How do I store oxalic acid?
    • Store in a cool, dry place out of the reach of children.
  • Can I use oxalic acid for all cleaning tasks?
    • While it is effective for many tasks, it is essential to follow label instructions.
  • Can oxalic acid be used to remove rust?
    • Yes, oxalic acid is very effective at removing rust. It is often used to remove rust stains from metals and other surfaces. Be sure to use proper dilution and safety precautions.
  • What should I do in case of accidental exposure to oxalic acid
    • In case of skin contact, rinse immediately with plenty of water. In case of eye contact, rinse the eye and seek medical attention. If inhaled, move to a place with fresh air and consult a doctor if necessary.

Where can I buy oxalic acid?

Order top quality oxalic acid from DutchChems, your trusted expert in chemical products. Why make it difficult when it can be easy? Place your order in just a few clicks and experience the convenience and efficiency of online shopping. Quality and safety come first, which is why we guarantee a high-quality product that is carefully and safely packaged and delivered very quickly. Your satisfaction is our priority!

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Oxalic acid is often used to remove limescale and rust. It is a versatile product that is used for many applications.
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