Plastic Bonded Magnets
In contrast to sintered magnets, plastic-bonded pressed magnets are already manufactured with significantly greater filigree geometries. The production of plastic-bonded injection-moulded magnets presents similar options in terms of shapes and sizes as in the production of technical plastic components. An additional mechanical processing stage is not normally required for injection-moulded parts.
Compared to sintered magnets, plastic-bonded magnets are considerably more flexible but do not achieve the mechanical qualities of technical plastics because of the high charge ratio. With unfavourable geometries, especially thin wall strengths or tight pole pitch, deviations from the material data can appear as a result of excessively fast solidification or inadequate directional field strengths.
As is generally the case with all bonded materials, the chemical resistance of plastic-bonded magnets is determined by the plastic matrix as well as the magnetic charge materials. Due to the high proportion of plastic surrounding the magnet material (approx. 30–50%), the magnetic particles of injection-moulded magnets enjoy extra protection. Any surface corrosion can only penetrate into the body of the magnet to a very limited extent. Pressed magnets, on the other hand, are approx. 10–20% plastic and, in contrast to injection-moulded magnets, cannot be manufactured as dense units. Although the resin coats the magnetic particles, in aggressive conditions these present a larger area of corrosive surface than for injection-moulded magnets. In critical applications, corrosion resistance is further improved by an appropriate coating.
If available you have the possibility to download PDF's for the individual magnet types. You find the appropriate files while hovering over their names in the tables below. The PDF then opens in a new window
Chart: Ferrite Magnets injection-moulded (PDF, 55 KB)
Chart: Ferrite Magnets Rubber (PDF, 55 KB)
Chart: SmFeN injection-moulded (PDF, 80 KB)
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