Melted alloy ingots are made into powder using powder metallurgy technology, which is directionally formed in a magnetic field. So after sintering and densification of the formed rough embryo in inert gas or vacuum, the sintered neodymium iron boron has a relatively high magnetic energy product and coercivity, high cost-effectiveness, and good mechanical properties.

How are sintered neodymium iron boron magnets classified?

Do you know that sintered neodymium iron boron magnets are evaluated based on the maximum magnetic energy product. Take a look at our neodymium magnet specifications page and you will find a rule that the maximum value of grade N35 (BH) is 33-36MGOe in the middle. Therefore, higher values indicate stronger magnets, ranging from N35 to N55.

The letter after the number represents the maximum operating temperature (usually in Celsius), ranging from M (100 ℃), H (120 ℃), SH (150 ℃), UH (180 ℃), EH200 ℃) to AH (220 ℃). If there is no letter like N42 after it, the maximum operating temperature is 80 ℃.