OXALIC ACID DIHYDRATE
What is oxalic acid: Oxalic acid is an organic compound with the formula H2C2O4. It is a colourless crystalline solid that dissolves in water to give colorless acidic solutions. It is classified as a dicarboxylic acid. Oxalic acid is a relatively strong organic acid with many commercial uses especially in the carpentry and joinery trades in the UK. Oxalic Acid can also be used to freshen wood colour if it has become grayed due to external exposure. In the refinishing of wooden furniture, oxalic acid can be used after stripping to lighten darker stained areas. It can also be used as a rust remover and a stain remover in many other applications.
Properties of Oxalic Acid Dihydrate:
CAS No: 6153-56-6
EINECS No: 205-634-3
MOL Wt: 126.07
Toxicity: Oral rat LD50: 7500 mg/kg
Physical state: white crystals
Melting Point: 101 - 102 C
Boiling Point: 149 - 160 C (sublimes)
Specific gravity: 1.6-1.7
Vapour density: 4.4
Flash point: 163 C
Where to use Oxalic Acid
- Wood bleach - To bleach old and stained wood removing tannin stains and water stains
- Rust removal- in removing rust on boats, in automotive shops and in restoring antiques
- in rust stain removal without harming Gel coat, fibre glass, steel and other metal surfaces
- for pre-treating stainless steel
- As a grinding agent in preparing & polishing stones & marble
- in restoring furniture
- For removing hard water stains from tiles and plumbing fixtures.
- by Beekeepers - a 3.5% solution of oxalic acid in sugar can protect against the parasitic Varroa mite (miticide) - see below.
- as a precipitator in rare earth mineral processing
- It is an important reagent in Lanthanide chemistry.
- Oxalic acid is used as a mordant in dyeing processes.
- In the US Oxalic acid is registered for use as a disinfectant to control bacteria and germs, and as a sanitizer, in toilet bowls, urinals and bathroom .premises.
- It can be used as a reducing agent in photography.
How to use Oxalic Acid
Prepare a solution by dissolving 60g of oxalic acid in 1 litre of water, apply to stain or rust and allow to work for 20-30 minutes. Always rinse thoroughly with clean water. For wood bleaching it is recommended to neutralize after treatment with a borax solution (3 tablespoons of borax dissolved in 1 litre of water).
When using on wood the wood must be free of all coatings, waxes & oils. It is necessary to use appropriate strippers and cleaners to remove coatings.
Treating Varroa mites with Oxalic acid:
Make up a solution of oxalic acid and sugar. For each litre of syrrup solution you will need 500g of sugar, 500mls of warm water and 35g of oxalic acid dihydrate. Mix in a plastic or glass vessel but not in a metal container. Completely dissolve the oxalic acid in half of the water; then add the sugar and the balance of water. Mix continuously until all sugar has been dissolved and you are left with a thick syrup. This solution should be used within a week of making or store in the fridge until needed. Note: Always wear appropriate safety gear including gloves and goggles when handling oxalic acid, even when applying the finished solution. The oxalic acid and sugar solution is best applied by dribbling rather than spraying as it is considered to be a safer and more effective method.
PLEASE NOTE: This product is not for human or animal consumption.
Health & Safety:
EU Classification Symbol: Xn
Harmful if swallowed.
Causes severe skin burns and eye damage.
May cause respiratory irritation.
UN Hazard Class: 8
UN Pack Group: III
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