Neo-magnet is made by powder metallurgy and prone to chipping and cracking. It should be used as its magnetic features, rather than its mechanical properties, for example, as a frame, holder or supporter in a design. It can be abrasively ground, cut or sliced, but only with the use of liberal amounts of coolant. Per to MMPA standards, visual imperfections such as hairline cracks, void, porosity and minor chips are commonly found in sintered metallic magnets and would not be considered as failure with some certain limits applied of course.

The basic specification for a magnet:
 Br: residual induction, the B value of a saturated magnet when the magnetic field inside the magnet is zero.   iHc: intrinsic coercive force is the field that needs to zero the magnetization M of the magnet. bHc: coercive force is the field that needs to zero magnetic induction B.  (BH)max: maximum energy product is the maximum of (BH) value. Tc: Curie temperature is the temperature point at which the ferri- or ferromagnetism starts to disappear. Tmax: maximum service temperature below that no significant loss could happen to the magnet’s physics properties. aBr , aiHc: Reversible temperature coefficient, the thermal stability as surrounding temperature changes. nre: Recoil permeability, average slope of recoil loop.

Coating is obvious an effective way to enhance NdFeB magnet’s anti-corrosive and lengthen it life in usage. Additional Co or other elements in the alloy can alos reduce the chance to be corroded.  The added Co segregates into the grain boundaries (where the corrosion occurs), directly hinders the formation of Nd2O3. Reducing the Rare Earth content declines corrosion that means fewer Nd-rich grain boundaries in the microstructure. Rapidly quenched material is less susceptible to corrosion.

Degradation of the magnetic and physical properties can only truly be contained by controlling the composition of the magnet, and by providing it with an effective coating  

Neo magnets are very strong after magnetized, also are very brittle. It is crucial to handle those magnets with extreme care to avoid personal injury and damage to the magnets. Magnetizing the magnets after assembly is highly recommended.  Dry powder, such as grinding dust may ignite at room temperature and burn slowly. Solid magnets spark at crash point only when being crashed. Don’t use vacuum cleaner or power sweeper to collect the powder to avoid the fire. Keep in house within container or packaging from fire, water and direct sunshine.

Curie temperature is a temperature at which the ferri- or ferromagnetism starts to disappear.

Not all magnets come out as being magnetized. Applying an external field usually can magnetize a magnet as long as the field strength is big enough to overcome the magnet’s coercive or resistant force. If you want to demagnetize a magnet, usually applying a revised and alternated magnetic field or heating up to exceed its Curie temperature works.