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The third generation of rare earth permanent magnet Neodymium iron boron is the most powerful permanent magnet among contemporary magnets. Its main raw materials include the metallic element iron 63.95-68.65%, the metallic element iron 63.95-1.2%, the non-metallic element boron 1.1-1.2%, the dysprosium 0.6-8%, niobium 0.3-0.5%, aluminum 0.3-0.5%, copper 0.05-0.15% and other elements.
1. Usually place a magnet of the same specification on a plane that can be absorbed, such as patch, blade, iron gate, etc., and use the handle to identify the size of the magnetic force
2. Use electronic balance: the weak magnetic force and its density is generally related, the density is small magnetic force is relatively small, the weight is heavy magnetic force is relatively large, on the contrary, the light weight magnetic force is small if the requirements of the magnet is high you need to test the instrument.
Each kind of product is divided into several brands according to the maximum magnetic energy product size
The grades of NdFeb magnetic materials are: N35 -- N52,35M -- 50M, 30H -- 48H,30SH -- 45SH, 28UH -- 35UH,28EH -- 35EH.
Example of grade: 048021 means that (BH) Max is 366-398kj /m3 and Hcj is 800KA/m of sintered NdFeb permanent magnet.