Injection Molded2022-02-18T07:18:27+00:00

Complex shapes, tight tolerances

Mold custom magnets – directly to shafts, bushings, or any other components.

Injection molded magnets offer designers and engineers a material with nearly unlimited dimensional and magnetic possibilities. They are made by mixing magnetic materials (NdFeB, ferrite) 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 molding allows for the production of intricately shaped magnets with extremely tight tolerances (up to .01mm) and a wide variety of physical and magnetic characteristics, depending on the type of magnetic material and binder utilized. Exceptional tensile strength provides high impact and rotational force resistance – and they have excellent chemical resistant properties as well.

Injection molded magnets are available in both neodymium and hard ferrite materials – and neodymium magnets made this way are also self- encapsulating, eliminating the need for additional corrosion resistant coatings or plating. It is also possible to utilize a range of blended hybrid materials to produce an incredibly wide range of potential energy products.

Injection molded magnets are the option our customers turn to most often to replace more traditional sintered or cast materials, allowing for local sourcing of magnets while streamlining the manufacturing process.  EAM’s knowledgeable product development team can help you choose the optimal combination of binder and magnet material for your specific application.

  • Unlimited shapes and magnetizing options

  • Ideal for high volume applications

  • Over-mold magnets directly to shafts, bushings, inserts, etc.

  • Excellent resistance to impact, rotational forces, chemicals

  • Tight tolerances

  • Available both isotropic and anisotropic

Injection Molded Neodymium & Hard Ferrite

Magnetic Properties

Viewing: Magnetic Properties of Injection Molded Neodymium

Name Anisotropic Magnet Isotropic Magnet
Residual flux density Coercive force Maximum energy product Residual flux density Coercive force Maximum energy product
Br bHc iHc (BH) max. Br bHc iHc (BH) max.
(G) (Oe) (Oe) (MGOe) (G) (Oe) (Oe) (MGOe)
Hard Ferrite / NYLON 6
EAM 9500 1000 950 1900 0.2 650 650 2000 0.1
140 2400 2200 2900 1.4 1250 1100 2900 0.3
160 2600 2250 2850 1.6 1370 1140 2800 0.4
170 2780 2350 2800 1.8 1450 1200 2800 0.5
190 2870 2350 2700 2.0 1480 1250 2700 0.5
200 3000 2400 2800 2.2 1530 1300 2800 0.6
Hard Ferrite / Nylon 12
062 1550 1400 2000 0.6 1050 1000 2000 0.2
132 2340 2200 3300 1.4 1200 1150 3250 0.3
152 2570 2350 3300 1.6 1320 1200 3250 0.4
172 2730 2400 2900 1.8 1400 1250 2850 0.4
192 2860 2400 2900 2.0 1460 1250 2850 0.5
202 2930 2500 2900 2.1 1500 1300 2850 0.6
Hard Ferrite / PPS
134 2350 2200 2850 1.4 1200 1150 2800 0.3
164 2640 2250 2800 1.7 1380 1200 2750 0.4
Nd-Fe-B / Nylon 12
362 5910 5050 12000 8.0 4000 3450 7900 3.3
392 7000 5110 12500 10.3 5000 3900 8000 5.0
502 7400 6050 12000 12.3 5700 4200 7500 6.0
602 8100 6300 12300 13.8 6100 4250 7500 7.0

Product Name Saturated flux density A.C. initial permeability µiac Relative loss factor tan / µiac Volume Resistivity
Bs 100KHz 1MHz 100KHz 1MHz
(G) Ω • m
Soft Ferrite / NYLON 6
410 3200 11.5 11.5 4.4 X 10-3 1.0 X 10-3 103
425 2450 15.0 15.0 2.8 X 10-3 8.0 X 10-3 107
Soft Ferrite / NYLON 12
422 3100 10.4 10.4 6.4 X 10-3 1.4 X 10-3 103
Soft Ferrite / Polyotefine
430 E 3050 10.1 10.1 5.6 X 10-3 1.3 X 10-3 103
Soft Ferrite / PPS
456 S 650 2.9 2.9 7.5 X 10-3 1.1 X 10-3 1011
465 N 2470 16.0 16.0 2.7 X 10-3 1.5 X 10-3 108
  • Conversion Formula (CGS unit SI unit) – 1G=10-4T 10e=80A/m 1MG0e=8kJ/m3
  • The above tables are based on reliable sources for reference only.
  • Users are advised to utilize them only after study of all relevant data.

Injection Molded Neodymium & Hard Ferrite

Demagnetization Curves

See data for several grades of neodymium below.

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