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Ferrofluids (FF) are stable colloid suspensions of magnetic particles of about 10 nm (magnetite, iron, etc.) finely dispersed in a carrying fluid that combines magnetic characteristics with fluidity. Magnetic particles being inserted in a carrier fluid improve its properties and can be controlled by magnetic field. This makes additional advantages for engineering.
 
Ferrofluid seals are non-contact groove seals that operate under the same principle as water seals. The major difference being the ferrofluid is suspended in the working gaps between mating parts by a magnetic field.
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