Ferrite magnets are sintered permanent magnets composed of Barium or Strontium Ferrite. This class of magnets, with good resistance to demagnetization and high working temperature, has the popular advantage of low cost. There are anisotropic and isotropic Ferrite magnets.
Ferrite magnets are corrosion free – for long term performance they are superb; if looked after they are capable of exceeding most products lifecycles.Ferrite magnets can be used up to +250 degrees C (and in some cases up to +300 deg C). Ferrite magnets are also low cost, particularly in high volume production runs. Ferrite / Ceramic Magnets resist chemical attacks from many of the alkaline solutions, dilute acids, organic solvents, and some hydroxides. They are fine for use in salt water conditions (no corrosion issues at all). It can be etched with acids (e.g. hydrochloric acid).
Ferrite permanent magnets have good machining properties which allows them to be cut into different shapes and sizes - they are cut with diamond tooling; standard drills and wire spark erosion techniques do not work (they are electrically insulating so current does not pass through them due to their extremely high electrical resistance, hence their other name of Ceramic Magnets).
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