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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.

injection molded plastic magnets

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

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