neodymium iron boron (NdFeB), nickel-plated, galvanised or tin-plated, glossy, extreme adherence strength (10 to 15 times stronger than normal ferrite magnets of the same size), direction of the magnetization is through the height (axial), for use at a maximum temperature of 80 °C; attention: the designation "N" does not refer to adherence strength (see Information about Neodymium Magnets)!
Model airplane makers are surely acquainted with our smallest rectangular magnets in the size 5 x 5 x 1.2 mm because they are small enough to be used in the motors of model airplanes. The 4 x 4 x 4 mm version, on the other hand, is well used as a decorative fastener of notes on a magnet pinboard. A single magnet is easily capable of holding 5 sheets of A4 paper!
In regards to their different surfaces, the three rectangular magnets are differentiated mainly in that the zinc coated magnet is somewhat more matte and lighter coloured and its slightly rougher surface takes better to gluing than the nickel or tin coated versions.
Neodymium magnets are extremely powerful. Crushing and bruising injuries can occur when handling these magnets, especially the larger ones. When two magnets collide together, small pieces can be broken off and cause injury. For these reasons the magnets should be handled carefully and they should definitely not be allowed to crash into one another from a distance. Magnets should never land in children’s hands because swallowing them can lead to serious medical problems.
Particularly the larger neodymium magnets should never be stored or used near devices or objects that can be damaged by magnetism. This can include, among others, televisions and monitors, credit cards, bankcards, computers, data storage devices of all kinds, video and music cassettes, mechanical clocks and speakers. A large magnet can also disturb heart pacemakers. When in doubt you should exercise caution!
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