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  26   N-30SH 10.8-11.2 1.08-1.12 10.1-10.6 804-844 ≥20 ≥1592 28-30 223-239 ≤150 27   N-33SH 11.4-11.7 11.4-11.7 10.6-11.1 844-884 ≥20 ≥1592 31-33 247-263 ≤150 28   N-35SH 11.7-12.1 1.17-1.21 10.8-11.5 860-915 ≥20 ≥1592 33-35 263-279 ≤150 29   N-38SH 12.1-12.5 1.21-1.25 10.8-11.5 860-915 ≥20 ≥1592 36-38 287-302 ≤150 30   N-40SH 12.6-12.9 1.26-1.29 10.8-11.5 860-915 ≥20 ≥1592 38-40 303-318 ≤150 31   N-42SH 13-13.3 1.30-1.33 11.4-11.9 907-947 ≥19 ≥1512 40-42 318-314 ≤140