Holding forces of permanent magnets are usually specified only under ideal conditions: at 20°C and with direct contact of the magnet to the holding surface. In a real application, however, this is not the case. The actual temperature is often higher and the magnet does not lie directly on the holding surface, e.g. because of its own coating. If the magnet is supposed to hold a thick sheet of paper or a cardboard, the distance to the holding surface increases additionally and the holding force of the magnet decreases strongly with an increasing distance.
Use our magnets calculator to find out how much holding force a magnet effectively generates in your application under real conditions.
Click here for the adhesive force calculation of magnets