... an iron based alloy,,NdFeB type rare earth magnet is much more prone to surface oxidation or ... rust,and elimination.Users should consider magnet coating,plating or suitable surface treatment.5) Less ... type rare earth magnet.7) Irreversible loss at high temprature.8) Types:N30,N33,N35,N38,N40,N42 ... ,N30SH,N33SH,N35SH,N25UH,N28UH,N30UH,N35SH,N38,N45,N48,N50 and N529) High energy ranging from ...