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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

GradeRemanence BrCoercivity HcbIntrinsic Coercivity HcjMaximum Energy Product (BH)maxDensityComposition
mTGskA/mOekA/mOekJ/m3MGOeg/cm3
FA112132130162204027935008.81.13.03Ferrite+PA6
FA1524524501832300251315011.91.53.32
FA1928428401952450235295015.61.963.6
FA20T29329301932420223280016.62.083.7
FA22T30530501912400229287018.12.273.85
FB12227227017121502793500101.263.1Ferrite+PA12
FB1625825801932430255320013.11.643.3
FB19R28328302052570255320015.51.953.58
FB20RT29429402032550247310016.72.13.7
FB23R306306020926202533180182.263.83
FC1424224201752200271340011.31.423.35Ferrite+PPS
FC1525025001792250247310012.11.523.44
FC16B25625601782234239300012.71.63.54
FC1726826801772226218273613.71.723.61

NdFeB plastic magnet​

GradeRemanence BrCoercivity HcbIntrinsic Coercivity HcjMaximum Energy Product (BH)maxDensityComposition
mTGskA/mOekA/mOekJ/m3MGOeg/cm3
NB2535335302473098725911221.82.733.79NdFeB+PA12
NB30L138138102563211671843124.63.094.21
NB4045545503003769697876034.74.364.52
NB5050350303254078647813241.95.264.91
NB7059259203704647681854956.77.135.34
NB8064764703844829589740165.48.225.67
NC1527627601952453679853113.61.713.52NdFeB+PPS
NC2033633602352946656824119.72.483.86
NC30370370026633469431184024.53.084.07
NC30L38438402643310680854825.43.194.21
NC40H447447031239158991129534.54.344.61
NC50500500034042748771102342.15.295.02
NC60533533037246728991129049.56.215.11
HNB120a7867860461579086010800101.112.74.92HDDR +PA12
HNB140a8218210501629010031260011314.25.15

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