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FAQ - Frequently Asked Questions

Why does the same magnet from your competitor have double the adhesive force?

The adhesive force indicated in our shop has been empirically defined and can be reached under ideal conditions. Measuring with wrong devices can lead to the establishment and promotion of much too high adhesive forces.
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Customers often ask us why a particular neodymium magnet from a competitor has an adhesive force of 400 kg, for instance, while our magnet of the same size is much "weaker".
Well, certain competitors simply measure the adhesive force incorrectly (see below). We are more than happy to lay out our procedure.

Procedure for measuring the adhesive force at supermagnete:

In order to identify the adhesive force of our neodymium magnets, we start by calculating the adhesive force with a computer program. This program is also the basis for our Adhesive Force Tool. Thereafter, we define the adhesive force with a self-developed adhesive force measuring machine.
In our shop, we indicate the lower of the two values to make sure we don't promise an inflated adhesive force. You can rest assured that our magnets can reach the indicated adhesive force under ideal conditions. You can read about ideal conditions under FAQ "How strong is this magnet?"
Our adhesive force measuring machine
DEATH MAGNET with wooden block

Preparation

On each magnet that we want to measure, we glue a little wooden block into which we screw a hook. Instead of wood we could also use aluminium or another non-magnetic material.

Measurements with our machine

1. We attach the magnet to the 2 cm thick steel plate on the adhesive force measuring machine. The wooden block is directed upwards.
2. We connect the hook on the machine with the hook in the wooden block.
3. We use the car jack that is mounted on the side to pull until the magnet separates from the plate. The integrated digital scale stops when the maximum adhesive force was reached.
Adhesive force directly before separation
Now, the maximum adhesive force was exceeded

Video of a measurement

We captured the adhesive force measurement of a hook magnet on video. The sequence here is easier to describe than above, because the hook on the machine is directly attached to the hook of the pot magnet. This eliminates the need to glue on a block of wood. In the video you'll hear a snapping sound when the hook magnet detaches from the metal. The detachment itself can be seen at 0:33/34. Even after the detachment the magnet is still so close to the steel plate, so you need to watch very carefully.

Wrong measurements with steel

Other vendors often attach a piece of metal to the top of the magnet. Metal on the opposite side increases the adhesive force of a magnet dramatically. This procedure actually measures the adhesive force of a magnet system (magnet between two steel plates). This type of measurement does not correspond with the standardised and exactly defined method of measuring adhesive force (see document below).
Such technically incorrect executed measuring efforts lead to an alleged adhesive force of 400 kg for a 50 x 50 25 mm neodymium magnet (comparable with our DEATH MAGNET), which is simply impossible. A magnet of this size cannot reach such a high adhesive force, not even with the strongest possible N52 magnetisation.
In the end, these vendors deceive their customers. Our adhesive forces might not sound as spectacular as those of our competitors - but ours can be actually reached in reality.

Conclusion:

Magnets of identical shape, size and quality have the same adhesive force. Therefore, a 50 x 50 x 25 mm block magnet with a N42 quality has an adhesive force of approx. 100 kg - regardless of the vendor.