4.Versatility of HPL
HPL surfaces equipped with magnetic layers generally have a ferritic layer. To ensure the processing of HPL elements in timber-processing workshops (no flying sparks, depending on the version), steel sheets are only a few micrometres thick. These layers are locally magnetised via the applied permanent magnets, providing the adhesion. This magnetisation diminishes over time once the permanent magnet is removed.
Permanent magnets are made from various materials and are available in a wide variety of shapes and designs. Their adhesive force is primarily determined by:
Low-cost permanent magnets are usually made of hard ferrite and are relatively thin (approx. 2 – 3 mm). Those are sufficient for securing a DIN-A4 page of standard paper with 1 – 2 magnets. For size A1 layouts are those, unlike more expensive neodymium magnets, less suitable. Therefore, it is necessary to decide for each particular application which and how many magnets have to be used for a specific task. Generally speaking, HPL with magnetic adhesion poses have no risk to human health, e. g. persons with pacemakers.
