Ambient temperature. Because of sintered NdFeB has a negative temperature coefficient (αBr <-0.13% / ℃, αHcj <-0.6% / ℃), so the use of the environment and sustainable instantaneous maximum temperature maximum temperature of the magnet itself will produce different levels of demagnetization, including reversible and irreversible, reversible and irreversible. Ambient humidity. NdFeB itself is prone to corrosion, oxidation, surface treatment of the general approach we take to protect the permanent magnet, but it does not fundamentally address the impact of humidity on the fundamental magnets. Environment more dry, the more lasting the life of the magnet. How to measure the magnetic properties of the high and low? There are three main parameters: remanence Br (Residual Induction), units of Gauss, is a measure of the external magnetic field strength can provide the parameters; coercive force Hc (Coercive Force), the unit Oersteds, is a measure of the ability of anti-demagnetization parameters; magnetic energy plot BHmax, unit Gauss-Oersteds, how much energy can be stored to characterize a physical.