Ambient temperature. Since sintered NdFeb has a negative temperature coefficient (Br<-0.13%/℃, Hcj<-0.6%/℃), the immediate maximum temperature and the continuous maximum temperature in the service environment will demagnetize the magnet itself to varying degrees, including reversible and irreversible, recoverable and unrecoverable.

Ambient humidity. Neodymium iron boron is easy to corrode and oxidize. Generally, we take surface treatment to protect permanent magnet. However, the influence of environmental humidity on magnet cannot be fundamentally solved. The drier the environment, the longer the service life of the magnet. How do you measure magnetism?

There are mainly three parameters: Residual magnets (Br), the unit Gauss, which measures the strength of the external magnetic field provided by the magnets; The Coercive Force Hc (Coercive Force) and unit Oersteds are the parameters used to measure the anti-demagnetization capability. The magnetic energy product BHmax, the gaUSs-Oersteds, is a physical quantity that represents how much energy can be stored.