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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.
Injection Molded Neodymium & Hard Ferrite
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.|
|Hard Ferrite / NYLON 6|
|Hard Ferrite / Nylon 12|
|Hard Ferrite / PPS|
|Nd-Fe-B / Nylon 12|
|Product Name||Saturated flux density||A.C. initial permeability µiac||Relative loss factor tan / µiac||Volume Resistivity|
|(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.
Charts & Data
See data for several grades of neodymium below.
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:
Browse Standard Parts
Injection Molded/Bonded Standard Parts
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