Ambient temperature. Since sintered NdFeB has a negative temperature coefficient (αBr <-0.13% / ° C, αHcj <-0.6% / ° C), both the instantaneous maximum temperature and the maximum sustained temperature of the environment of use exert different degrees of demagnetization on the magnets themselves, including Reversible and irreversible, recoverable and unrecoverable.
environment humidity. NdFeB itself is easy to corrosion, oxidation, and generally we take the surface treatment to protect the permanent magnet, but it does not fundamentally solve the impact of environmental humidity on the magnet. The more dry the environment, the longer the life of the magnet. How to measure the level of magnetic properties?
There are three main parameters: Residual Induction (unit: Gauss) is a measure of the strength of the magnetic field provided by the magnet. Coercive force (unit: Oersteds) is a measure of the anti-demagnetization capability. Product BHmax, in units of Gauss-Oersteds, is a physical quantity characterizing how much energy can be stored.