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Magnetic shielding materials re-direct a magnetic field so it lessens the field's influence on the item being shielded. Shielding does not eliminate or destroy magnetic fields, nothing does. It does, however, provide an easy path for the magnetic field to complete its path. You may think of it as a magnetic field conductor.

This leads to what type of material can provide the best path for magnetic fields and thus create shielding. Since the field is attracted to the shielding material it stands to reason that if a magnet is attracted to the material (ferromagnetic material), that material can provide some amount of magnetic shielding.

Shield calculation formulas do exist to help solve electro magnetic shielding problems, but are usually valid only for theoretical conditions of closed shield shapes and well-described interference fields. Remember, one test is worth a thousand expert opinions. The easiest way to calculate magnetic shield values and properties is with our free-for-the-asking CO-NETIC® Magnetic Shield Calculator. This easy to use slide chart performs the calculations demonstrated below simply and quickly.

Formulas for magnetic calculations are based upon a perfect spherical shield and a point field source. These conditions are seldom encountered in practical shielding situations. However, the formulas can be helpful if modified for simplicity and used with discretion.

Also, technical data concerning the magnetic properties of shielding materials is based upon standard samples. Some variance in production runs may occur due to material thickness, annealing time and temperature tolerances.

Use Magnetic Shield's Calculator to determine shield design characteristics and give you an estimate of the strength of the shielded field for each standard thickness of our Co-Netic® AA Perfection annealed foil and sheet. Contact us to receive your FREE Calculator (www.magnetic-shield.com).