How to Understand the Rare Earth Permanent Magnets’ Grades? Part 2 – Bonded Neodymium Iron Boron Magnets
Unlike sintered NdFeB magnets having extensive recognition of the uniform grades in the global market, the grades of bonded NdFeB magnets are mainly based on the technology and standard of each manufacturer itself. For our company, the grades of bonded NdFeB magnets mostly include two parts, i.e. “HGT-“ + “number”. The left part “HGT” is our company’s short name. The right part “number” represents value of (BH)max (in CGS unit). The value varies from 2 to 12. In a few grades, there is an “H” added in the end, meaning higher coercivity compared with the grade of the same number. For example, the grade “HGT-8” means that the relative bonded NdFeB magnet’s (BH)max is 8 MGOe. Compared with the grade “HGT-10”, the grade “HGT-10H” has a higher Hcj level.