As already discussed in previous sections, the NdFeB magnet has various grades:- each grade has its magnetic properties (relating to the strength of magnetic field output and resistance to demagnetization, maximum recommended operating temperature, and temperature coefficients).
The grades have other physical properties which are similar between the grades. Below is an overview of these properties:
| Characteristic | Symbol | Unit | Value |
| Density | D | g/cc | 7.5 |
| Vickers Hardness | Hv | D.P.N | 570 |
| Compression Strength | C.S | N/mm2 | 780 |
| Coefficient of Thermal Expansion | C// | 10-6/°C | 3.4 |
| C^ | 10-6/°C | -4.8 | |
| Electrical Resistivity | r | µ Ω.cm | 150 |
| Temperature Coefficient of Resistivity | a | 10-4/°C | 2 |
| Electrical Conductivity | s | 106S/m | 0.667 |
| Thermal Conductivity | k | kCal/(m.h.°C) | 7.7 |
| Specific Heat Capacity | c | kCal/(kg.°C) | 0.12 |
| Tensile Strength | σUTS, or SU | kg/mm2 | 8 |
| Young’s Modulus | l / E | 1011N/m2 | 1.6 |
| Flexural Strength | b | 10-12m2/N | 9.8 |
| Compressibility | s | 10-12m2/N | 9.8 |
| Rigidity | E.I | N/m2 | 0.64 |
| Poisson’s Ratio | n | 0.24 | |
| Curie Temperature | Tc | °C | 310 |
Structural use of Neodymium Iron Boron, NdFeB, magnets
There is a risk of chipping or breaking the magnets because all magnets are inherently brittle. The Neo magnets are less brittle than SmCo. It is advised to not put magnets in conditions of mechanical stress e.g. in load-bearing situations.
How to test real silver using neodymium magnets:
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