Plastic Bonded & Molded Magnets, Plastic Magnets – Compression Bonded and Injection Molded Rare Earth (NdFeB, SmCo), Ferrite, Alnico and Hybrid Magnets

Plastic Bonded Molded Magnets:

Compression Bonded Magnets
Injection Molded Magnets
Powdered NdFeB, SmCo, Alnico and Ferrite with a binder
Hybrid magnetic powder combinations possible e.g. NdFeB plus Ferrite
May require a dedicated press tool and magnetising fixtures
Tooling charges may sometimes apply

Plastic Bonded & Molded Magnets

Plastic Bonded & Molded Magnets

Compression Molding of Magnets uses a solid binder (e.g. a plastic or thermosetting epoxy) plus the magnetic material. The end material is isotropic – the magnetising coil fixture design determines the magnetic pattern it takes. Compression molding is cost effective when higher volumes are required – compression molded magnets are best produced in tens or hundreds of thousands of magnets per production run.

Advantages of Compression Bonded Magnets:-
A higher ratio of magnetic material powder to binder gives higher magnetic performance than the injection molded magnets (higher magnetic loading).
NdFeB, SmCo, Alnico and Ferrite versions possible.
Hybrid versions as well (e.g. NdFeB plus Ferrite) with combined properties.
Good tolerances – secondary machining not needed.
Low electrical conductivity, low eddy currents.

Disadvantages of Compression Bonded Magnets:-
The compression bonding process is limited to simpler shapes such as rectangles, rings, arcs and cylinders.
A consistent cross sectional area is required along the pressing direction.
Possible tooling charges for production and magnetising.

Injection Molding uses a solid binder (e.g. a plastic or thermosetting epoxy) plus the magnetic material but gives a greater variety of shapes and complexity of shapes compared to compression bonded. The end material is isotropic – the magnetising coil fixture design determines the magnetic pattern it takes.
Overmolding is possible with injection molding process.
Injection molded magnets are produced in tens or hundreds of thousands of magnets per production run.

Advantages of Injection Molded Magnets:-
More complex shapes are possible.
Overmold, insert mold, etc all possible.
NdFeB, SmCo, Alnico and Ferrite versions possible.
Hybrid versions as well (e.g. Ferrite+NdFeB) with combined properties.
Low electrical conductivity, low eddy currents.
Good tolerances. More resistant to chipping than compression bonded.
Disadvantages of Injection Molded Magnets:-
Injection molded magnets offer lower magnetic performance than the compression bonded magnets (due to lower magnetic loading).
Possible tooling charges for production and magnetising.

We can produce Compression Bonded, Injection Molded or Plastic Magnets to a wide variety of grades with a custom range of sizes, shapes and magnetisation options. We would need to review your design requirements to determine feasibility of production before we could provide a quotation. Because of this, the majority of such magnets are custom made.

Compression Molded Neodymium Magnets

Compression Molded Neodymium Magnets

Bonded Molded Magnets

Compression Molding NdFeB Magnets

Compression Molding NdFeB Magnets

Bonded Molded Magnets

Bonded Neodymium Iron Boron Magnets

Bonded Neodymium Iron Boron Magnets

Bonded Molded Magnets