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What is mumetal ?

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What is mumetal ?

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MUMETAL offers important electromagnetic field shielding characteristics, including very high magnetic permeability – its ability to absorb magnetic energy. The unique properties of this family of alloys results in the highest possible attenuation, making these shielding alloys the materials of choice for reducing low-frequency electromagnetic interference (EMI). MUMETAL is an industry reference material, with different characteristics than proprietary alloys. MUMETAL meets MILSPEC 14411C, composition 1. When the specification or the application calls for a magnetically soft or high permeability material, MUMETAL can frequently be successfully applied. To obtain optimum magnetic properties, annealing MUMETAL alloy following fabrication is essential. This should be done in a furnace that allows for careful control of the annealing temperature and cooling rate. Optimum properties are reached in a pure hydrogen atmosphere.

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This is a trade name that contains 80 % Nickel, 4.5 % Molybdenum and balance Iron. Other names include Permalloy, Hy Mu80, Magnifer 7904. These alloys all have very high magnetic permeability resulting in the highest possible attenuation ratio.

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