Лако-красочные материалы — производство

5.1

Magnetic Pigments

5.1.1

Iron Oxide Pigments

Ferrimagnetic iron oxide pigments are used in magnetic information storage sys­tems such as audio and videocassettes, floppy disks, hard disks, and computer tapes. Cobalt-free iron(III) oxide and non-stoichiometric mixed-phase pigments (so called Berthollide FeO%Fe2O3, with 0<x<1) have been used since the early days of magnetic tape technology. Currently, y-Fe2O3 [1309-37-1] and Fe3O4 [1317-61-9] (the latter in small amounts) are mainly used in the production of low-bias audio cassettes (iron oxide operating point IEC I standard (International Electrotechnical Commission), and studio, broadcasting, and computer tapes.