Sintered Neodymium Iron Boron (Sintered NdFeB)
Due to over 20 years of continuous development the Neodymium Iron Boron Family has evolved over 30 grades based on the maximum energy product and operating temperature. Some grades have become obsolete as laboratory curios become factory product. Some factories are now claiming operating temperatures as low as 50ºC and up to 230ºC for specialist use. MagDev source from several factories and a summary of the range of grades is shown below. Please note that not all sizes are available in all grades. It is wise to seek assistance during the concept stage of product design to establish what we can offer.
Select a Shape
List of shapes available in this material
Typical Magnet and Physical Specifications
Grade
Type |
Br kG
min/typ |
bHc kOe
min/typ |
jHc kOe
Oersted |
BHMax
min/typ |
Max
Temp ºC |
Comments |
| N35 |
11.7/12.1
|
10.8/11.4 |
>12 |
33/35 |
80 |
A basic, low cost magnet offering good strength at room temp |
| N30H |
10.8/11.2
|
10.1/10.6 |
>17 |
28/30 |
120 |
A basic grade useful to 120ºC but at the expense of some energy |
| N33H |
11.4/11.7
|
10.3/11.0 |
>17 |
31/33 |
120 |
Slightly higher energy than N30H |
| N35H |
11.7/12.1
|
10.8/11.4 |
>17 |
33/35 |
120 |
Good strength to 120ºC becoming our standard grade |
| N44H |
12.9/13.5
|
12.3/13.1 |
>16 |
40/44 |
120 |
Our top energy grade used for cutting small orders and special sizes |
| N27SH |
10.2/10.6
|
9.8/10.3 |
>20 |
25/27 |
150 |
Higher temp use at the expense of more energy |
| N30UH |
11.0/11.6 |
10.3/11.1 |
>27 |
28/32 |
180 |
Highest temp grade block for cutting |
| Density g/cc |
7.5 |
| Young’s Modulus kN/mm2 |
150 |
| Curie Temp. ºC |
310 |
| Bending Strength N/mm2 |
250 |
| Spec. Res ~Ω mm2/m |
1.5 |
| Compressive Strength N/mm2 |
1000 |
| Hardness (Vickers) |
580 |
| Thermal Conductivity W/mºC |
9 |
