Injection molded magnets are a type of composite material which composed of magnetic powder and thermoplastic binder. Injection molded magnets can be divided to isotropic type and anisotropic type base on whether apply orientation field or not during the molding process. Magnetic properties of isotropic injection molded magnets are significantly lower than compression’s due the lower filling ratio of magnetic powder. Injection molded magnet also can be classified to injection molded NdFeB magnets, injection molded ferrite magnets, injection molded SmCo magnet, and injection molded SmFeN magnets according to the type of powder. The maximum operating temperature of PA12, PA, and PPS binder can reach 120, 150, and 180 degrees Celsius, respectively. Injection molded magnets are well adapted for mass production with higher dimensional accuracy, complex shape, superior mechanical strength, low weight, and integrated ability with other functional parts.
Manufacturing Process of Injection Molded Magnets
Magnetic Properties of Injection Molded NdFeB Magnets
| Grade |
Remanence Br |
Coercivity Hcb |
Intrinsic Coercivity Hcj |
Max. Energy Product (BH)max |
Max. Operating Temperature Tw |
Temp. Coefficient Of Br |
Density ρ |
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| mT | kGs | kA/m | kOe | kA/m | kOe | kJ/m3 | MGOe | ℃ | %/℃ | g/cm3 | |
| BZ-3 | 350-450 | 3.5-4.5 | 200-280 | 2.5-3.5 | 400-460 | 5.0-8.0 | 20-28 | 2.5-3.5 |
PA12: 120 PA6: 150 |
-0.11 | 4.5-5.0 |
| BZ-4 | 400-500 | 4.0-5.0 | 240-320 | 3.0-4.0 | 560-720 | 7.0-9.0 | 32-48 | 4.0-6.0 | -0.11 | 4.5-5.0 | |
| BZ-5 | 450-550 | 4.5-5.5 | 304-360 | 3.8-4.5 | 640-800 | 8.0-10.0 | 36-44 | 4.5-5.5 | -0.11 | 4.5-5.1 | |
| BZ-6 | 500-600 | 5.0-6.0 | 328-384 | 4.1-4.8 | 640-800 | 8.0-10.0 | 44-52 | 5.5-6.5 | -0.11 | 4.7-5.2 | |
| BZ-6 | 550-650 | 5.5-6.5 | 344-400 | 4.3-5.0 | 640-800 | 8.0-10.0 | 52-60 | 6.5-7.5 | -0.11 | 4.7-5.3 | |
| BZ-5 (PPS) | 450-550 | 4.5-5.5 | 320-400 | 4.0-5.0 | 880-1120 | 11.0-14.0 | 36-44 | 4.5-5.5 | PPS: 180 | -0.11 | 4.8-5.3 |
| BZ-6 (PPS) | 500-600 | 5.0-6.0 | 320-400 | 4.0-5.0 | 880-1120 | 11.0-14.0 | 44-52 | 5.5-6.5 | PPS: 180 | -0.11 | 4.9-5.4 |
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Magnetic Properties of Injection Molded Ferrite Magnets
| Grade |
Remanence Br |
Coercivity Hcb |
Intrinsic Coercivity Hcj |
Max. Energy Product (BH)max |
Max. Operating Temperature Tw |
Temp. Coefficient Of Br |
Density ρ |
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| mT | kGs | kA/m | kOe | kA/m | kOe | kJ/m3 | MGOe | ℃ | %/℃ | g/cm3 | |
| BZ-F1.5 | 220-240 | 2.2-2.4 | 160-167 | 2.00-2.10 | 231-240 | 2.90-3.00 | 11.6-12.4 | 1.45-1.55 |
PA12: 120 PA6: 150 |
-0.19 | 3.25 |
| BZ-F1.9 | 270-290 | 2.7-2.9 | 180-186 | 2.25-2.33 | 216-228 | 2.70-2.85 | 14.8-15.6 | 1.85-1.95 | -0.19 | 3.63 | |
| BZ-F2.0 | 280-290 | 2.8-2.9 | 184-200 | 2.30-2.50 | 216-246 | 2.70-3.10 | 15.6-16.4 | 1.95-2.05 | -0.19 | 3.70 | |
| BZ-F2.1 | 280-290 | 2.8-2.9 | 190-204 | 2.38-2.55 | 216-249 | 2.80-3.12 | 16.4-17.2 | 2.05-2.15 | -0.19 | 3.75 | |
| BZ-F1.7 (PPS) | 250-260 | 2.5-2.6 | 167-175 | 2.10-2.20 | 208-216 | 2.60-2.70 | 13.6-14.0 | 1.70-1.75 | PPS: 180 | -0.19 | 3.65 |
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