Magnetic Materials List

Material Residual Flux Density
Br (Gauss)
Coercive Force
Hc (Oersted)
Max. Energy Product Bhmax (MGOe)
Cast Alnico V 12800 640 5.5
Sintered Alnico V 10900 620 3.95
Cast Alnico VIII 8200 1650 5.3
Sintered Alnico VIII 7400 1500 4.0
SmCo 18 8500 8000 18.0
SmCo 22 9500 8600 22.0
SmCo 26 10500 9200 26.0
NdFeB 30H 11600 10000 30.0
NdFeB 38 12550 11700 38.0
Ceramic I 2300 1860 1.00
Ceramic V 3800 2400 3.40
Ceramic VIII 3850 2950 3.50
Flexible Regular 1600 1370 0.60
Flexible High Force 2200 1900 1.10
Material Slope of Load Line at Bhmax Curie Point
(°C)
Max. Practical Oper. Temp
(°C)/(°F)
Cast Alnico V 18.0 890 540/1000
Sintered Alnico V 18.4 860 540/1000
Cast Alnico VIII 5.0 870 540/1000
Sintered Alnico VIII 5.0 840 540/1000
SmCo 18 1.0 700 260/500
SmCo 22 1.0 825 260/500
SmCo 26 1.0 825 350/660
NdFeB 30H 1.0 300 140/280
NdFeB 38 1.0 310 110/220
Ceramic I 1.2 460 400/750
Ceramic V 1.1 460 400/750
Ceramic VIII 1.0 460 400/750
Flexible Regular 1.2 * 120/248
Flexible High Force 1.2 * 120/248

*Because of bonding agents, flexible magnets may not operate above 120 °C

Material Temp Coefficient (%Loss/°C) Density (lbs/cubic Inch) Relative Cost By Weight
Cast Alnico V 0.013 0.264 15
Sintered Alnico V 0.007 0.253 10
Cast Alnico VIII 0.013 0.265 15
Sintered Alnico VIII 0.007 0.253 10
SmCo 18 0.030 - 0.045 0.300 100
SmCo 22 0.015 - 0.030 0.300 100
SmCo 26 0.015 - 0.030 0.300 100
NdFeB 30H 0.090 - 0.120 0.267 80
NdFeB 38 0.090 - 0.130 0.267 80
Ceramic I 0.129 0.167 2
Ceramic V 0.190 0.180 2
Ceramic VIII 0.19 0.180 2
Flexible Regular 0.19 0.133 1
Flexible High Force 0.19 0.140 1