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  2. Ferrofluidic seal - Wikipedia

    en.wikipedia.org/wiki/Ferrofluidic_seal

    Magnetic liquid seals can be engineered for a range of applications and exposure, but are generally limited to sealing gases and vapors, not direct pressurized liquid. This is due to premature failure of the ferrofluid seal when it seals a liquid. In 2020, research was underway to try and solve this problem. [3]

  3. Electromagnetic door holder - Wikipedia

    en.wikipedia.org/wiki/Electromagnetic_door_holder

    The mechanism may be mounted near the floor, at the upper corner of the open door, or at any convenient height along the latch edge (away from the hinged edge). A steel plate, often mounted on a ball joint or swivel joint, is attached to the door so that it can contact the electromagnet when the door is fully opened. An electric current ...

  4. Anti-magnetic seal - Wikipedia

    en.wikipedia.org/wiki/Anti-magnetic_seal

    Anti-magnetic seal (from Latin: plumbum — lead) or anti-magnetic sticker, indicator of the magnetic field is a device that serves to indicate the influence of magnetic fields on the protected object and helps to reduce theft of energy (electricity, water, gas, heat, fuel).

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  6. Electromagnetic compatibility - Wikipedia

    en.wikipedia.org/wiki/Electromagnetic_compatibility

    RF gaskets come in various types. A plain metal gasket may be either braided wire or a flat strip slotted to create many springy "fingers". Where a waterproof seal is required, a flexible elastomeric base may be impregnated with chopped metal fibers dispersed into the interior or long metal fibers covering the surface or both.

  7. Ferrofluid - Wikipedia

    en.wikipedia.org/wiki/Ferrofluid

    The fluid of magnetic particles forms a barrier which prevents debris from entering the interior of the hard drive. According to engineers at Ferrotec, ferrofluid seals on rotating shafts typically withstand 3 to 4 psi; [14] additional seals can be stacked to form assemblies capable of withstanding higher pressures.