Oxalic acid

Oxalic acid (CAS 144-62-7, EC 205-634-3, formula C2H2O4) is a dicarboxylic organic acid commercially known under names including Aktisal and Aquisal, and abbreviated as H2ox or (COOH)2. It carries no E-code designation and is classified under HS code 29171110.

In textile and leather processing, oxalic acid removes iron-based stains and rust by chelating ferric ions, rendering them soluble and washable. In mining and metals refining, it precipitates rare earth elements from leach solutions through selective complexation. Water treatment operations use it to regulate pH and sequester calcium and heavy metal ions that would otherwise cause scaling.

Oxalic acid is available in anhydrous powder and granular solid forms, as well as aqueous solution. Grades include technical, reagent, and Ph.Eur.-compliant pharmaceutical quality. The substance is registered under REACH and suppliers should confirm SDS compliance with current EU CLP regulation prior to procurement.