ASTM International Standard ASTM A753 covers wrought nickel-iron soft-magnetic alloys that are commonly used for production of magnetic cores or magnetic shields that require high magnetic permeability, high electrical resistivity, low coercive field strength, and low core losses.  Our Mu-Metal alloy was developed for Magnetic Shield Corporation to meet the chemical requirements for the ASTM A753 Alloy 4 type.  Our MuMetal ® is used to fabricate magnetic shields that are used primarily in low intensity fields where high attenuation is desired (high initial permeability & high shielding efficiency). Mu metal offers exceptionally high initial and maximum permeability and it also has very low remanence.

Available as stress annealed (partially annealed for ease of machinability), or fully annealed for maximum permeability. Mu METAL® is used for fabricated shields such as enclosures, cylinders, cans, channels or 3D boxes. Typically, final annealing in a hydrogen atmosphere furnace is required after stamping, machining, bending, rolling or welding to provide maximum shielding performance.

MuMETAL® alloy is available in many forms, but most shields are fabricated from our sheet or coil stock in gauges from 0.014" to 0.080" thickness [0.36mm to 2mm]. MuMETAL foil stock is fully annealed and available in gauges from 0.002" to 0.010" thickness [0.05mm to 0.25mm]. Foil is also available stress annealed by request.

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MuMETAL® conforms to specs ASTM A753 Alloy 4 and MIL-N-14411C Composition 1

MuMETAL® is a registered trademark of Magnetic Shield Corporation.