Iron(iii) oxide hydrate

Iron(III) oxide hydrate, CAS 12259-21-1, is an inorganic iron compound with the formula Fe2O3.xH2O, commercially known under names including Ferrox, Iron Oxide Yellow, Ferric oxide hydrate, and Hydrous ferric oxide. It carries no assigned E-code and is distinct from anhydrous iron oxides by its variable water content.

In building and construction materials, it functions as a mineral pigment that imparts stable yellow-ochre coloration to concrete, mortar, and render through dispersion within the matrix. In plastics and textile processing, its surface hydroxyl groups interact with polymer chains and fiber substrates, enabling both coloration and surface modification at the interface.

This compound is supplied under REACH compliance and is available in technical and pigment grades suited to construction, printing, and leather applications. Packaging formats typically include 25 kg bags and bulk quantities. Buyers should confirm grade specification against relevant industry standards prior to procurement.