Oxalic acid dihydrate
CAS 6153-56-6
EC 612-167-2
Formula C2H2O4.2H2O
MW 126.07 g/mol
Organic Acids Textile, Leather & PaperMining & MetalsAgriculture & FeedPharmaceuticals & HealthcareFood & NutritionWater TreatmentPersonal Care & Cosmetics Chelation & SequestrationpH Regulation & BufferingCatalysisPreservation & Biocide
Description
Oxalic Acid Dihydrate (CAS 6153-56-6, EC 612-167-2, formula C2H2O4·2H2O) is a naturally occurring dicarboxylic acid supplied in its stable hydrated crystalline form. Also referenced as Oxalsäure-dihydrat and Oxalic Acid 2-Hydrate, it carries no assigned E-code and is classified under HS code 29171100.
In metal surface treatment and mining, Oxalic Acid Dihydrate removes iron oxides and rust by forming soluble iron oxalate complexes, enabling selective leaching and cleaning without aggressive mineral acids. In textile and leather processing, it acts as a reducing bleach and pH buffer, correcting iron staining while maintaining controlled bath acidity.
The product is available in technical, pharmaceutical (Ph.Eur.), and food-contact grades as a free-flowing powder. It is fully REACH-registered and can be supplied in multi-wall paper sacks or bulk quantities. Buyers should confirm grade suitability against FCC or Ph.Eur. monographs for regulated applications.
In metal surface treatment and mining, Oxalic Acid Dihydrate removes iron oxides and rust by forming soluble iron oxalate complexes, enabling selective leaching and cleaning without aggressive mineral acids. In textile and leather processing, it acts as a reducing bleach and pH buffer, correcting iron staining while maintaining controlled bath acidity.
The product is available in technical, pharmaceutical (Ph.Eur.), and food-contact grades as a free-flowing powder. It is fully REACH-registered and can be supplied in multi-wall paper sacks or bulk quantities. Buyers should confirm grade suitability against FCC or Ph.Eur. monographs for regulated applications.
Physical Properties
| Melting Point | 102 °C |
| Boiling Point | 102 °C |
| Density | 1.65 g/cm³ @ Temp: 25 °C |
| Flash Point | 157°C |
| Appearance | white crystals |
| Color | Yellow to yellow-green |
| Form | Powder/Solid |
| Water Solubility | 138 g/L (20 ºC) |
| Vapor Pressure | <0.01 mm Hg ( 20 °C) |
| pH | ~1.0 (25℃, 1M in H2O) |
Safety & Handling (Learn More)
Danger GHS05 GHS07 GHS08
H
H302H312H314H315H318H373H302+H312
P
P260P264P270P280P316P317P319P321P330P363P405P501P264+P265P301+P317P302+P352P304+P340P332+P317P362+P364P301+P330+P331P302+P361+P354P305+P354+P338
Trade & Regulatory
| HS Code | 29171100 |
| UN Number | 3261 |
| ADR Class | 8 |
| Packing Group | III |
| WGK (Germany) | 1 |
Other Names
OxybeeOXALIC ACIDOXALIC ACID 2H2OETHANEDIOIC ACIDDany's BienenWohlETHANEDIONIC ACIDOxalsαure-dihydratOXALIC ACID-2-HYDRATE
Related Products
Raw Materials
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