Bulk supply · Mineral & Organic Acids
Oxalic acid dihydrate crystals in 25 kg bags and one tonne jumbos, for marble polishing, textile bleaching, rust removal and metal treatment. Price on request against your quantity and delivery point.
Also searched as: oxalic acid price, oxalic acid powder, oxalic acid dihydrate, ethanedioic acid, oxalic acid price per kg
What we supply
Oxalic acid is one of the strongest of the common carboxylic acids — its first dissociation constant, pKa about 1.25, puts it far ahead of acetic or formic acid — but its industrial value comes less from acid strength than from its ability to grab metal ions. It chelates iron, which is why it lifts rust and iron stains off stone, timber and fabric where a mineral acid would simply etch the surface and leave the stain behind. The same chemistry is what makes it a marble and terrazzo polishing agent — it reacts with the calcium at the surface and leaves a hard, light-reflecting skin.
It is traded as the dihydrate, a white crystal or powder, and that is what the grade in the table above refers to. Two things about it are routinely underestimated. It is genuinely poisonous — not an irritant that people call poisonous, but a substance whose sale in Gujarat is licensed under the Poisons Act — and it will happily dissolve calcium out of things you did not intend, which is why it should never be left standing on polished stone or on galvanised and aluminium surfaces.
Grades & packing
These are the formats we most commonly supply. Other grades, packing sizes and pack marking are available — ask at the enquiry stage.
| Product | Formula | Grade | HSN | Packing |
|---|---|---|---|---|
| Oxalic Acid | C₂H₂O₄ | 99.6% min | 2917 11 10 | 25 kg bag · 1 MT jumbo |
No tested values are published here. The certificate of analysis for the batch actually loaded travels with the despatch documents, and a representative COA and the safety data sheet go out before any commercial discussion.
Applications
Crystallising and polishing marble, terrazzo and granite — one of the largest outlets in the Indian market.
Removing iron stains from stone, timber, fabric and radiator and boiler systems.
Bleaching assistant, stripping agent and a mordant in dyeing and printing.
Pickling, anodising electrolytes and the phosphating of steel.
Bleaching and neutralising in tanneries.
Lightening and removing water and iron marks from timber.
Handling & storage
Worth reading before you order rather than after. If any of this is a problem at your site, tell us — it usually changes what we would quote.
Price
A large share of the oxalic acid in the Indian market is imported, so the price tracks international offers, the exchange rate and freight more closely than any local manufacturing cost. Bag versus jumbo and delivery point set the rest. We quote per kg or per MT in writing, landed, with a stated validity.
Questions
It reacts with the calcium carbonate at the surface of the stone to form a hard, close-grained calcium oxalate layer that takes and holds a shine. It also lifts iron staining out of the stone at the same time, which is why polishers reach for it rather than for a mineral acid.
Yes. It is toxic if swallowed or absorbed through skin and can cause kidney injury, and its sale in Gujarat is licensed under the Poisons Act. It is a legitimate industrial chemical handled safely every day, but it is not a household product and should not be treated as one.
Our packing starts at 25 kg bags and we supply documented industrial buyers, because sale is licensed and every transaction has to be recorded against the buyer's identity. We do not sell it for personal or unrecorded use.
Oxalic acid in India is largely imported, so the price follows international offers, the exchange rate and freight. We quote per kg or per MT, landed, with a stated validity.
From a licensed supplier, against documented industrial use. Sale in Gujarat is licensed under the Poisons Act and every transaction is recorded against the buyer's photo identity, so it is not an over-the-counter purchase.
The HSN code for oxalic acid is 2917 11 10 (Oxalic acid). Dihydrate and anhydrous share the code; there is no Indian sub-split below this line. Source: the Indian customs tariff as listed in the GST HSN directory, checked September 2026.
Documentation
Shipped as a dangerous good under UN 3261. A TREM card travels on the vehicle.
| Document | What it covers for oxalic acid | When you get it |
|---|---|---|
| Product specification | Download the product specification sheet for oxalic acid (PDF) — CAS, formula, grade supplied against, packing, HSN and transport classification. Carries no test results and certifies no batch. | Download now |
| Safety data sheet (MSDS/SDS) | Download the 16-section GHS safety data sheet (PDF) — compiled from PubChem, the ECHA CLP inventory and ILO safety cards. The producer’s sheet for the lot supplied governs and is issued with the consignment. | Download now |
| Representative COA | A producer’s representative certificate of analysis for the grade you specify, obtained at enquiry stage so your QC can assess oxalic acid against your own specification | Before commercial terms |
| Batch COA | Tested values for the batch actually loaded on your vehicle | With despatch documents |
| Technical data sheet | Handling, storage and materials-of-construction guidance | On request |
| TREM card | Transport emergency information for the driver, on the vehicle | With the consignment |
We do not publish blank certificates to download. A certificate of analysis belongs to a batch, so a generic one tells you nothing about the material on your vehicle — and the safety data sheet is the producer’s document for the grade actually quoted. Ask and both are emailed, usually the same working day.
Related lines
Sourcing desk
You will get a written offer for oxalic acid with landed price, packing, lead time and a stated validity — not a price that changes on the phone.