Plastic Magnets | Injection Molded Magnets
Definition of plastic magnets
Injection molded plastic magnets offer designers and engineers a material with nearly unlimited dimensional and magnetic possibilities. They are made by mixing magnetic materials (hard ferrite, NdFeB, SmFeB) with a polymer binder (usually nylon or PPS) which then allows the magnet to be injection molded just as any other plastic would be. In addition to providing maximum shape complexity, these magnets can be over-molded directly onto/around existing components like shafts or bushings, often eliminating the need for secondary gluing or assembly.
Advantages of plastic magnets
- Both injection molding and extrusion molding are possible manufacturing process to manufacture plastic magnets, which allow the plastic magnet product to have complex shapes. Compared to sintered magnets, plastic magnets are less prone to cracking and chipping, and because of their high dimensional accuracy, no post-processing is required.
- With plastic magnets, magnetic circuits with multiple poles and sine waves are possible. A smoother and more precise magnetic waveform helps reduce cogging in the motor and improves the accuracy of the sensor.
- Since plastic magnets can be overmolded or insert-molded, it helps to eliminate the bonding and lamination process, which reduces size and weight.
Hard ferrite plastic magnet
| Grade | Remanence Br | Coercivity Hcb | Intrinsic Coercivity Hcj | Maximum Energy Product (BH)max | Density | Composition | ||||
| mT | Gs | kA/m | Oe | kA/m | Oe | kJ/m3 | MGOe | g/cm3 | ||
| FA11 | 213 | 2130 | 162 | 2040 | 279 | 3500 | 8.8 | 1.1 | 3.03 | Ferrite+PA6 |
| FA15 | 245 | 2450 | 183 | 2300 | 251 | 3150 | 11.9 | 1.5 | 3.32 | |
| FA19 | 284 | 2840 | 195 | 2450 | 235 | 2950 | 15.6 | 1.96 | 3.6 | |
| FA20T | 293 | 2930 | 193 | 2420 | 223 | 2800 | 16.6 | 2.08 | 3.7 | |
| FA22T | 305 | 3050 | 191 | 2400 | 229 | 2870 | 18.1 | 2.27 | 3.85 | |
| FB12 | 227 | 2270 | 171 | 2150 | 279 | 3500 | 10 | 1.26 | 3.1 | Ferrite+PA12 |
| FB16 | 258 | 2580 | 193 | 2430 | 255 | 3200 | 13.1 | 1.64 | 3.3 | |
| FB19R | 283 | 2830 | 205 | 2570 | 255 | 3200 | 15.5 | 1.95 | 3.58 | |
| FB20RT | 294 | 2940 | 203 | 2550 | 247 | 3100 | 16.7 | 2.1 | 3.7 | |
| FB23R | 306 | 3060 | 209 | 2620 | 253 | 3180 | 18 | 2.26 | 3.83 | |
| FC14 | 242 | 2420 | 175 | 2200 | 271 | 3400 | 11.3 | 1.42 | 3.35 | Ferrite+PPS |
| FC15 | 250 | 2500 | 179 | 2250 | 247 | 3100 | 12.1 | 1.52 | 3.44 | |
| FC16B | 256 | 2560 | 178 | 2234 | 239 | 3000 | 12.7 | 1.6 | 3.54 | |
| FC17 | 268 | 2680 | 177 | 2226 | 218 | 2736 | 13.7 | 1.72 | 3.61 | |
NdFeB plastic magnet
| Grade | Remanence Br | Coercivity Hcb | Intrinsic Coercivity Hcj | Maximum Energy Product (BH)max | Density | Composition | ||||
| mT | Gs | kA/m | Oe | kA/m | Oe | kJ/m3 | MGOe | g/cm3 | ||
| NB25 | 353 | 3530 | 247 | 3098 | 725 | 9112 | 21.8 | 2.73 | 3.79 | NdFeB+PA12 |
| NB30L1 | 381 | 3810 | 256 | 3211 | 671 | 8431 | 24.6 | 3.09 | 4.21 | |
| NB40 | 455 | 4550 | 300 | 3769 | 697 | 8760 | 34.7 | 4.36 | 4.52 | |
| NB50 | 503 | 5030 | 325 | 4078 | 647 | 8132 | 41.9 | 5.26 | 4.91 | |
| NB70 | 592 | 5920 | 370 | 4647 | 681 | 8549 | 56.7 | 7.13 | 5.34 | |
| NB80 | 647 | 6470 | 384 | 4829 | 589 | 7401 | 65.4 | 8.22 | 5.67 | |
| NC15 | 276 | 2760 | 195 | 2453 | 679 | 8531 | 13.6 | 1.71 | 3.52 | NdFeB+PPS |
| NC20 | 336 | 3360 | 235 | 2946 | 656 | 8241 | 19.7 | 2.48 | 3.86 | |
| NC30 | 370 | 3700 | 266 | 3346 | 943 | 11840 | 24.5 | 3.08 | 4.07 | |
| NC30L | 384 | 3840 | 264 | 3310 | 680 | 8548 | 25.4 | 3.19 | 4.21 | |
| NC40H | 447 | 4470 | 312 | 3915 | 899 | 11295 | 34.5 | 4.34 | 4.61 | |
| NC50 | 500 | 5000 | 340 | 4274 | 877 | 11023 | 42.1 | 5.29 | 5.02 | |
| NC60 | 533 | 5330 | 372 | 4672 | 899 | 11290 | 49.5 | 6.21 | 5.11 | |
| HNB120a | 786 | 7860 | 461 | 5790 | 860 | 10800 | 101.1 | 12.7 | 4.92 | HDDR +PA12 |
| HNB140a | 821 | 8210 | 501 | 6290 | 1003 | 12600 | 113 | 14.2 | 5.15 | |
About Tengye: Tengye supplies finest permanent magnet materials to world industry. We work closely with our customer from designing stage to mass production.
