Bonded NdFeB magnets for complex shapes and multipole designs.

Bonded NdFeB combines rare earth magnetic material with a binder system, enabling molded or compressed geometries, tight dimensional repeatability, inserts, and magnetization patterns that are difficult with simple sintered parts.

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MaterialNdFeB powder with polymer binder

ProcessInjection molded or compression bonded

ShapesRings, rotors, arcs, inserts, molded forms

Main reasonShape variety, tolerance, and multipole patterns

Product

Shape freedom, integrated features, and controlled pole patterns.

Bonded NdFeB is the route for molded or compressed geometries where sintered machining would be difficult, wasteful, or unable to deliver the required multipole pattern. Tooling, binder, wall thickness, and magnetization fixture should be reviewed as one specification.

High freedom for molded forms

Multipole and radial magnetization options

Repeatable dimensions for production programs

Use this route when

The part needs complex geometry, thin walls, inserts, or molded features.
The magnetic pattern is multipole, radial, or fixture-dependent.
Dimensional repeatability matters more than maximum energy product.
Production volume can justify tooling and process route review.

Review before choosing

Magnetic output is usually lower than sintered NdFeB and must be checked against the target.
Injection vs compression route changes tolerance, tooling, and magnetic properties.
Binder material affects temperature, chemical resistance, and mechanical behavior.
Magnetization coils and fixture design should be planned before launch.

Specification

Complex geometry with a deliberate output tradeoff.

Bonded NdFeB usually delivers lower magnetic output than sintered NdFeB, but it can reduce assembly steps and enable features such as thin walls, inserts, sleeves, and pole patterns. The correct route depends on injection molding, compression bonding, binder system, and expected volume.

Specification should define geometry, binder route, and magnetization pattern together.

Material system	Bonded NdFeB; magnetic powder plus polymer binder selected by process and application.
Typical forms	Multipole rings, rotors, arcs, sleeves, thin-wall parts, inserts, and molded assemblies.
Process route	Injection molding for shape freedom; compression bonding for higher magnetic loading where suitable.
Magnetization	Multipole, radial, axial, or custom fixture-dependent patterns.
Engineering risk	Magnetic output tradeoff, tooling cost, wall thickness, binder limits, and annual volume.

Technical Data

Bonded NdFeB material reference bands.

These ranges help compare process routes. Final performance depends strongly on powder loading, binder, part geometry, and magnetization pattern.

Grade / Route	Br (T)	Hcj (kA/m)	BHmax (kJ/m³)	Max temp. (°C)	Density (g/cm³)
Injection molded PA	0.35-0.55 T	500-750 kA/m	20-55 kJ/m3	100 C	3.8-5.0 g/cm3
Injection molded PPS	0.35-0.52 T	500-720 kA/m	20-50 kJ/m3	150 C	3.8-5.0 g/cm3
Compression bonded N8	0.55-0.62 T	600-800 kA/m	50-65 kJ/m3	120 C	5.5-6.0 g/cm3
Compression bonded N10	0.60-0.68 T	650-850 kA/m	65-80 kJ/m3	120 C	5.5-6.0 g/cm3