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Conductive antistatic bags are manufactured with a layer of conductive metal, often aluminum, [3] and a dielectric layer of plastic [2] covered in a static dissipative coating. This forms both a shield and a non-conductive barrier, shielding the contents from static charge via the Faraday cage effect.
Effectiveness of the shielding of a static electric field is largely independent of the geometry of the conductive material; however, the static magnetic fields can penetrate the shield completely. In the case of varying electromagnetic fields, the faster the variations are (i.e., the higher the frequencies), the better the material resists ...
Shielding: Materials that attenuate current and electrical fields Low-charging or Anti-static : Materials that limit the buildup of charge by prevention of triboelectric effects through physical separation or by selecting materials that do not build up charge easily.
Conductive ESD bag with a network card inside ESD shoes. Electrostatic discharge materials (ESD materials) are plastics that reduce static electricity to protect against damage to electrostatic-sensitive devices (ESD) or to prevent the accidental ignition of flammable liquids or gases.
Antistatic garments attempt to shield ESD sensitive devices from harmful static charges from clothing such as wool, silk, and synthetic fabrics on people working with them. For these garments to work properly, they must also be connected to ground with a strap.
For static or slowly varying magnetic fields (below about 100 kHz) the Faraday shielding described above is ineffective. In these cases shields made of high magnetic permeability metal alloys can be used, such as sheets of permalloy and mu-metal [ 9 ] [ 10 ] or with nanocrystalline grain structure ferromagnetic metal coatings. [ 11 ]
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