... best quality. Neodymium Block Magnet 1. Material and Grade: Sintered Neodymium Ferrite BoronN35~N52, N35M~N50M ... N33EH2. Coating and test: Zn, Ni, NiCuNi, epoxy, electrophoresis, etc. Spray test, pressure test, peeling off test and thickness test are applied in ... widely used in aviation, spaceflight, electron, mechanism, meter and medical treatment, loudspeakers, sensors, motors, rotors, wind turbines ...