... .Very stable. 3.Strong resistance to demagnetization Sintered NdFeB permanent magnet************************Products performance:Grade: N35-N52,30H-48H,30SH-45SH,30UH ... ,28EH-33EHHigh corrosion resistant Very well stable Lower priceSalt spray test: 24 to 72 hoursCoating: Ni, Zn, Epoxy, Silver, Glod, Chrome ... )≥2388(≥30)247-271(31-34)200 Sintered NdFeB permanent magnet