Magnetic ABC

A

Air gap

The distance between a magnet and the point at which the desired adhesion is required, e.g. a FERRO foil. All non-magnetic metals, plastics and paints are also regarded as air gaps.

Anisotropic

Structurally unequal concerning the directions of space, which for magnets means that during the production process they are exposed to a high magnetic field which forces the “elementary magnets” to align themselves in the direction given by the preferred axis. This results in better magnetic values than with other directions of space.

D

Demagnetizing

Electro-magnetic fields or very strong magnetic fields such as from NdFeB magnets as well as excessive temperatures can de-magnetize magnets. In addition, it should be noted that magnetic materials are always sensitive to impact and pressure.

H

Holding Force

The holding forces have been determined at room temperature on a polished 10mm thick steel plate (S235JR in accordance with DIN 10 025) by pulling the magnet vertically from the surface (1kg~10N). A maximum deviation of -10% compared to the specified values is possible in exceptional cases. In general, the value will be exceeded.

I

Isotropic

Structurally equal concerning the directions of space, which for magnets means that there is no preference in terms of the direction of space.

M

Magnetic and magnetic adhesion – the difference

Ferric materials are magnetically adhesive and are used as a base for adhesion for magnets or magnetic films (to which a magnet can be attached). Magnets and magnetic films are permanently magnetic and offer excellent adhesion, for example to our FERRO products.

Here you can find our short explanation as PDF.

Magnetic or magnetic adhesion
Magnetizing

Alignment of elementary magnetic areas by means of an external magnetic field.

Materials

Hard ferrite
Hard ferrite magnets

Average working temperature
Smallest adhesive power


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NdFeB magnets

Low working temperature
Highest adhesive power


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SmCo magnets

Average working temperature
Highest adhesive power


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AINiCo magnets

Highest working temperature
Medium adhesive power


O

Operation temperature

Maximum temperature at which magnets can be used. Individual specifications on maximum operation temperatures are to be observed for each magnet. A system’s holding power generally declines at higher temperature ranges. Exceeding the specified temperature will affect plastic, glue and possibly also magnetic values.

S

Solvents, acids and alkalis

If you intend to use magnetic systems in connection with solvents, acids or alkalis then get in touch with us – we would be happy to advise you.

T

Types of magnetizing

Axial, diametric, single-sided, multi-pole, strip-magnetized, radial

Magnetarten

General information

  1. The holding forces have been determined at room temperature on a polished 10mm thick steel plate (S235JR in accordance with DIN 10 025) by pulling the magnet vertically from the surface (1kg~10N). A maximum deviation of -10% compared to the specified values is possible in exceptional cases. In general, the value will be exceeded.
  2. Small cracks in the magnet do not influence holding forces.
  3. Dimension A refers to the length by which the bar magnet could be shortened without being damaged.
  4. The holding force will be reduced by up to 15% due to magnetic short circuits when the bar magnet is mounted directly onto iron. In order to avoid this, certain distances between the brass coat of the bar magnet and the iron have to be maintained. These distances should also be kept at the rear end in case the bar magnet was shortened by dimension A and then mounted onto iron.