Encyclopedia of Polymers and Composites

Living Edition
| Editors: Kamal K. Kar (Editor-in-Chief)


Living reference work entry

Later version available View entry history

DOI: https://doi.org/10.1007/978-3-642-37179-0_34-1


Magnetite is a hard, black, ferrimagnetic, lustrous iron oxide, Fe3O4, which occurs naturally but may also be synthesized, especially when nanoparticles are desired. It is used as specialty filler because of its unique combination of electrical, thermal, and magnetic properties as well as for its exceptionally high density.


Magnetite is a remarkable material with unusual properties and diverse applications. Probably the best-known example is magnetite iron ore used for steel production, which consumes millions of tons per year. Another lesser known use is in water purification, where very high purity magnetite is used as a feedstock to produce iron-based chemicals. It is also used as a catalyst in the production of ammonia. There are many other less well-known places where we encounter magnetite. For example, true gun bluing is a thin layer of magnetite which passivates the surface of iron to help prevent corrosion and to lend a decorative effect. Magnetite and...


Iron oxide Magnetite High density Microwaveable Specialty filler Radiation shielding 
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I would like to thank Roger Rothon for inviting me to write this piece and for his helpful feedback. LKAB Minerals are thanked for supporting me and in particular Luke Hollingbery for the SEM of MagniF 10 and for very valuable comments. Peter Duifhuis is thanked for contributing his deep expertise in magnetite having pioneered its use in plastics.


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Authors and Affiliations

  1. 1.LKAB Minerals Inc., Phantom Plastics LLCCincinnatiUSA