Magnetic shielding - forms of supply
As a rule shielding problems are individual and need to be solved on an individual basis. We have a long-term experience with respect to the theoretical background, the measuring technique, design and production processes as well as with the magnetic annealing treatment of shieldings from very small to really big. Let us know your problem, and we will support you with reasonable proposals and practical solutions.
However some standard design are availabe ex stock which might be suitable depending on the application. Just give us a call to find out.
Magnetic shielding foils
Soft magnetic materials need to see an annealing treatment for optimal properties. Elastic tension and especially plastic deformation seriously reduce the permeability and thus the shielding efficiency. However in many applications foils from MUMETALL® are suitable for first basic tests and allow a good judgement of the requirered shielding measures (e. g. with cans or specific shaped boxes with higher wall thickness). In some cases they are even sufficient to solve the problem.
- Shielding foils from MUMETALL® are available w/o or with adhesive layer in a size of 0,1/0,05 x 155 mm and variable length starting from 1 m.
- Shielding foils from the amorphous alloy VITROVAC® 6025X feature a unique combiation of mechanical hardness and flexibility with permeabilties higher than those of MUMETALL® foils of the same thickness. Furthermore the magnetic properties are by far less sensitiv against elastic tensions (bending) due to the low magnetostriction of the alloy. Main applications are cable shieldings with small winding diameter as well as fast and flexible solutions against weaker magnetic fields. Foils from VITROVAC® are available in widths up to 50 mm with a strip-thickness of 0,02 mm.
Shielding tubes from the high permeability alloy MUMETALL® are used to shield sensitive (against magnetic fields) cables or to avoid magnetic field radiation from electric cables. Such problems may occur in aircrafts or ships or with sensitive medical eqipment.
Compared with copper shielding, MUMETALL® shielding tubes are effective at static or very low frequency fields. The tubes are available in standard nominal diameters from 6 to 32 mm. With a shielding factor of about 200 they effectively protect from and against magnetic fields.
More „sophisticated“ profiles are produced by metal machining, forming, welding etc. This processing requires some specific adjustments to the materials special mechanical properties. A possible influence on shape and tolerances as a consequence of the annealing treatment needs to be considered.
Especially with complex forms with many openings FEM results should be taken with some care and the shielding factor should be verified by measurements (see also measuring services).
Shielding panels and cut parts
We stock panels from MUMETALL® or PERMENORM® in sizes of 600 - 640 mm x 2000 mm and typical thicknesses of 0,35 to 3 mm, which may be purchased complete or cut according to your requirements. Please note that in most cases magnetic annealing is essential to achieve the best magnetic properties.