Difference between blank magnets and finished magnets

Magnetic property: So called "magnetic property" is detected from the blank magnets (semi-product from sintering process) after some simple grinding on the surfaces.

For the finished magnets, we suggest testing on Magnetic flux density (mWb) OR Surface gauss (Gs) etc. but not BHmax, because this value on finished magnets is smaller then it on blank magnets due to smaller volue/size/weight (which can not be calculated by ratio) after blank magnets being machined. The loss is happened during the machine tooling processes such as: pickling during electroplating, and chamfering.