There are three important parameters to measure the performance of the merits of permanent magnetic materials— remanence Br, coercive force Hc and (BH) max. These three parameters determine the performance of magnetic materials.
NdFeB magnetic materials are called “the king of magnet”. That is because it has the most excellent Br, hC(Hc) and (BH)Max(max). Of these three parameters, (BH) max is the most important one. The division of magnetic material is determined based on this parameter. Its unit is MGOe. The greater it is, the stronger the magnet is. Now the (BH) value of NdFeB magnetic material in the current market supply is generally between 30 and 50, which is labeled as N30~N50.
In addition, according to the specific needs, sometimes the temperature performance of materials and the surface binding property of the products should be paid special attention to. They should be defined and tested according to the national standards.