Black iron oxide

Black iron oxide (CAS 1317-61-9, EC 215-277-5, Fe3O4) is an inorganic iron compound also known as magnetite, iron ferrite, and ethiops iron. It carries no E-code designation and is classified under the Salts & Minerals category. The formula Fe3O4 reflects its mixed ferrous-ferric composition.

In building and construction, Fe3O4 functions as a pigment in concrete and coatings, where its stability under alkaline conditions prevents colour shift over time. In electronics and automotive manufacturing, its magnetic properties and conductivity make it a functional component in electromagnetic shielding materials and as a catalyst support in chemical processing operations.

Black iron oxide is supplied as a dry powder in technical and industrial grades, compliant with REACH registration requirements applicable to EU markets. Packaging typically follows standard bulk and intermediate bulk container formats. Buyers should confirm grade specifications against application requirements, particularly for electronics or catalytic end uses.