Selecting Magnetic Shielding Materials

When selecting magnetic shielding materials, there are several parameters which need to be considered. The most critical is determining the strength or flux density of the magnetic field to be shielded. Other factors, such as shield geometry, required attenuation, and mechanical stability are also important. Once the field strength has been determined, either by direct measurement with a gauss meter or by mathematical modeling, the appropriate magnetic shielding alloy can be selected.
The ability to conduct magnetic lines of flux is called permeability, and in a magnetic shield, the degree of permeability is expressed numerically. The standard is free space , which has a permeability value of one. In comparison, MuShield’s magnetic shielding materials range in permeability from 200-350,000. Knowing the permeability value of the magnetic shielding materials you are choosing from is imperative when selecting the proper materials for your magnetic shield.