... an iron based alloy, NdFeB type rare earth magnet is much more prone to surface oxidation or rust, and elimination. Users should ... type rare earth magnet7) Irreversible loss at high temperature8) Types: N30, N33, N35, N38, N40, N42, N30M, N33M, N35M, N38M, N40M ... , N35SH, N25UH, N28UH, N30UH, N35SH, N38, N45, N48, and N509) High energy ranging from 8MGOe to 48MGOe with wonderful coercive force10) Less ...