Magnetic Fluid Seals
Magnetic fluid seals are sealing devices in which magnetic fluids
are used as the sealing material. Magnetic fluids have the
characteristic of being drawn to a magnet.
As opposed to conventional oil seals or mechanical seals, magnetic
fluid seals are clean seals that utilize magnetism to hold a
magnetic fluid around a rotating shaft to form a fluid O-ring.
Magnetic fluid seals are used as dust seals for hard disk drives,
in which a clean environment is required, and as vacuum seals for
semiconductor manufacturing equipment and liquid display