Magnetic-shielding metals

The materials that fall under this category are used in airport environments, which deal with what is known in the industry as ELF (extremely low frequency) radiation interference to ticketing computer terminals caused by the close proximity of building utility electrical vaults as well as to main switchgear rooms.

Another application is in the production of handheld electronic equipment with and without radio cards.

Material Types

MuShield works primarily with an 80% nickel alloy. The alloy, with such trade names as HyMu80, Permalloy, and MuMetal, shields from low-frequency electromagnetic interference. For high-frequency shielding, refer to fabricators that work with copper, aluminum, and other conductive materials.

The term "B-40" is an arbitrary starting point for high-permeability alloys because it is a good average value of the flux density induced within a piece of high-permeability material.

It has also been found that time-varying (AC) magnetic fields need to be attenuated below 7 milligauss for most monitor applications. Also, larger monitors are more sensitive to EMI.

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