Sintered NdFeB permanent magnet contains basic raw materials neodymium (Nd) 32%, iron (Fe) 64%, boron (B) 1%, , with small amount of dysprosium (Dy), terbium (Tb), cobalt (Co) , niobium (Nb), gallium (Ga), aluminum (Al), copper (Cu) and other elements, Sintered NdFeB permanent magnetic materials with  the high remanence, high coercivity, and was known as the " Magnetic King" The main characteristics of permanent magnetic materials is : good magnetic properties , high temperature performance. High Curie temperature,up to 710 ~ 880 degrees Celsius, the maximum operating temperature up to 250 ~ 350 degrees Celsius. So the stability of permanent magnet magnetic material is best, it is suitable for manufacturing various high-performance permanent magnet electro-acoustic devices.

MAGNETIC AND PHYSICAL CHARACTERISTICS (NdFeB)

No. TYPE Remanence Br Coercive-force bHc Intrinsic coercive force iHc Max. energy product (BH) max Working Temperature KGs T KOe KA/m KOe KA/m MGOe KJ/m³ 0C 32   N28UH 10.4-10.8 1.04-1.08 9.8-10.2 780-812 ≥25 ≥1990 26-28 207-223 ≤180 33   N30UH 10.8-11.2 1.08-1.12 10.1-10.6 804-844 ≥25 ≥1990 28-30 223-239 ≤180 34   N35UH 11.7-12.1 1.17-1.21 10.5-11.2 836-890 ≥25 ≥1990 33-35 263-278 ≤180 35   N38UH 12.2-12.6 1.22-1.26 11.4-11.9 907-947 ≥25 ≥1990 36-38 287-303 ≤180