General Information As rare earth permanent magnets, NdFeB are Lanthanide alloys, and the most advanced commercial permanent magnet materials. NdFeB can be subdivided into different grades, widely used in different areas. Sintered NdFeB and bonded NdFeB are the two forms of NdFeB. Up to 10MGOe, the magnetics energy products of the bonded NdFeB is much lower than that of the sintered NdFeB.