Sintered NdFeB Sintered NdFeB are the most advanced commercial permanent magnet materials. They can be subdivided into different grades, widely used in different areas. The most widely used magnetic material for motors are sintered NdFeB. Sintered NdFeB magnet features great magnetic strength which can bring large torque for rotors and stators. Among sintered NdFeB grades, the H, SH, EH and UH series are popular in that they can withstand working temperature up to 100-200°C without losing magnetism.