Injection Molded/Bonded

Complex shapes, tight tolerances…

unlimited possibilities

Mold custom magnets – directly to shafts,

bushings, or any other components.

Injection Molded/Bonded

Injection Molded/Bonded

EAM is an industry leader in the design and production of injection molded magnets. These unique magnets are made by mixing magnetic material with a polymer binder (usually nylon or PPS) which then allows the magnet to be injection molded just as any other plastic would be.

Injection molding allows the production of intricately shaped magnets with extremely tight tolerances and a wide variety of physical and magnetic characteristics.

A wide range of properties are possible depending on the type of magnetic material and binder utilized. EAM offers both Neodymium and Hard Ferrite injection molding capability, and it is also possible to utilize a blend of different magnetic material to produce the desired properties.

EAM’s knowledgeable product development team will assist you in choosing the optimal combination of binder and magnet material for your specific application.

One of the greatest advantages of the injection molding process is that a high degree of shape complexity is possible — ie. gears, snap fits and undercuts. It is also possible to incorporate shafts, brushes and other inserts into the process, simplifying the magnetic assembly manufacturing process. Injection molded magnets can be insert molded directly onto or around existing components, often eliminating the need for additional steps in the manufacturing process.

Properties

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 4000 3450 7900 3.3
392 5000 3900 8000 5.0
502 5700 4200 7500 6.0
602 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.

EAM-InjMoldedNeoFerrite-MagPhysProps.pdf

Charts & Data

See data for several grades of neodymium below.

Injection Molded Neodymium & Hard Ferrite DEMAGNETIZATION CURVES

One
One

EAM-Neodymium_Mat_Property_Chart.pdf

EAM-InjMoldedNeoFerrite-MagPhysProps.pdf

Photos

Photos

Case Studies

Postage Machine Manufacturer / Advanced Injection Molding Read more

Power Tool Manufacturer Read more

Tier 1 Commercial Automotive Supplier Read more

After-Market Magnetic 'Break-Away' Oil Filter Read more

A Magnetic Stirrer for the Food Industry Read more

Compression Bonded Magnets

    

Compression Bonded Magnets

Neodymium magnets can be manufactured in several ways, and one of the most innovative is the process of compression bonding.

Compression bonding is a die-pressing process that involves mixing neodymium powder with an epoxy binder and pressing high-density parts that are then oven-cured.

Compression bonding results in magnets that exhibit higher energy products (more than 10 MGOe) than those made by injection molding; however they are limited to more basic shapes due to the nature of the die-pressing process.

Compression bonded neodymium magnets are ideal for applications requiring tight tolerances and high magnetic strength. They are isotropic – so they may be magnetized in any direction – and the epoxy binder allows bonded magnets to be resistant to most industrial automotive fluids and solvents. Compression bonded magnets exhibit good mechanical strength. Tooling costs are generally lower than they are for injection molded parts. Bonded magnets have an operating temperature range from -40˚C to 165˚C.

Compression Bonded Neodymium Charts and Data

Select the grade to view data below:

info-comp-a9h-01
info-comp-a9h-02
info-comp-b10-01
info-comp-b10-02
info-comp-c9h-01
info-comp-c9h-02
info-comp-d10-01
info-comp-d10-02
info-comp-o8-01
info-comp-o8-02

Download PDF of entire curve data series

Browse Standard Parts

Injection Molded/Bonded Standard Parts

Need a stock magnet for prototyping, design work, crafts or home projects?

We’ve made it easy to browse EAM’s standard parts and make purchases easily with a credit card. All orders ship direct from our NY or PA locations.

Just click to be redirected to EAM’s online magnet store: