Neodymium magnets may lose their magnetic force permanently at temperature of 80°C or above.
Most magnets are hard and brittle. When drilling or sawing a magnet with improper tools, the magnet may break. The emerging heat may demagnetize the magnets. The magnets will rust and disintegrate due to the damaged coating.
Oxidation and rust
The magnets should be kept in good condition and avoid following environment in case that magnets may rust or become weak in mechanical or magnetic performance.
1) With acid, alkali, organic solvent or electrolytes.
2) Immersed in water or in oil.
3) Hydrogen atmosphere.
4) Corrosive atmosphere such as Cl2, NH3, NOx, etc.
5) With radioactive rays.
Be careful in assembling magnets and prevent the tiny fragments from entering into eyes or causing other injuries. The magnets may break into pieces when collide each other or with other materials. Big block of magnets will strongly attract each other or attract iron steel pieces, which may cause serious injure to person.
Magnets could affect the functioning of pacemakers and implanted heart defibrillators. A pacemaker could switch into test mode and cause illness, and a heart defibrillator may even stop working.
Magnetic fields of improperly packaged magnets could influence airplane navigation devices. So magnets are required to be in packaging with sufficient magnetic shielding for airfreight.
Magnetic Field Influence
Keep magnets away from magnetic memory media or other magnetic sensitive devices such as magnetic cards, tapes, disks, hard disk drives, and watches. Otherwise information stored in the media or the devices may be damaged.