Compression Molded NdFeB Magnets
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Compression molded NdFeB magnets combine rapidly quenched neodymium magnetic powder with a thermoset binder, followed by high-pressure compaction and controlled curing. The process is well suited to precision rings, sleeves, discs, thin-wall components and multi-pole magnetic parts.
Compared with sintered NdFeB, compression molded magnets provide lower eddy-current loss, good dimensional repeatability and more flexible magnetization patterns. Vanguard supports BNP material selection, tooling, prototypes, magnetization fixtures and series production.
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Select BNP grade using the required air-gap flux, torque or sensor signal, plus temperature and demagnetizing-field exposure.
Wall thickness, draft, corner radius, undercuts, inserts and demolding direction should be resolved before tooling release.
Define pole count, pole width, phase position, reference mark and waveform acceptance criteria early in development.
Concentricity, runout, shaft or hub fit, adhesive clearance and balancing targets affect finished rotor performance.
The following table retains the BNP-series data previously supplied for this page. Final performance should be confirmed against magnet geometry, molding conditions, magnetization fixture and the agreed inspection method.
| Grade | Remanence | Coercivity | Intrinsic Coercivity | Max. Energy Product | Max. Operating Temperature | Temp. Coefficient Of Br | Density | ||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| Br | Hcb | Hcj | (BH)max | Tw | ρ | ||||||
| mT | kGs | kA/m | kOe | kA/m | kOe | kJ/m³ | MGOe | °C | %/°C | g/cm³ | |
| BNP-2 | 300-400 | 3.0-4.0 | 160-240 | 2.0-3.0 | 440-600 | 5.5-7.5 | 19-26 | 2.4-3.3 | 160 | -0.11 | 5.6-6.0 |
| BNP-3 | 400-510 | 4.0-5.1 | 216-280 | 2.7-3.5 | 504-680 | 6.3-8.5 | 24-32 | 3.0-4.0 | 160 | -0.11 | 5.6-6.0 |
| BNP-4 | 460-520 | 4.6-5.2 | 224-288 | 2.8-3.6 | 504-680 | 6.3-8.5 | 30-35 | 3.8-4.4 | 160 | -0.11 | 5.6-6.0 |
| BNP-5 | 470-550 | 4.7-5.5 | 240-360 | 3.0-4.5 | 520-680 | 6.5-8.5 | 37-44 | 4.7-5.5 | 160 | -0.11 | 5.6-6.0 |
| BNP-6 | 550-650 | 5.5-6.5 | 320-376 | 4.0-4.7 | 600-720 | 7.5-9.0 | 44-52 | 5.5-6.5 | 160 | -0.11 | 5.6-6.0 |
| BNP-7 | 550-650 | 5.5-6.5 | 320-408 | 4.0-5.1 | 560-680 | 7.0-8.5 | 52-64 | 6.5-8.0 | 160 | -0.11 | 5.6-6.0 |
| BNP-8 | 620-670 | 6.2-6.7 | 400-456 | 5.0-5.7 | 640-800 | 8.0-10.0 | 64-76 | 8.0-9.5 | 160 | -0.11 | 5.8-6.2 |
| BNP-9 | 650-700 | 6.5-7.0 | 416-456 | 5.2-5.7 | 680-800 | 8.5-10.0 | 68-76 | 8.5-9.5 | 160 | -0.11 | 5.8-6.2 |
| BNP-9H | 650-700 | 6.5-7.0 | 432-488 | 5.4-6.1 | 920-1040 | 11.5-13.0 | 71-80 | 8.9-10.0 | 180 | -0.1 | 5.8-6.1 |
| BNP-10H | 650-710 | 6.5-7.1 | 432-480 | 5.4-6.0 | 784-960 | 9.8-12.0 | 74-82 | 9.3-10.3 | 180 | -0.1 | 5.8-6.1 |
| BNP-10 | 670-720 | 6.7-7.2 | 424-480 | 5.3-6.0 | 640-800 | 8.0-10.0 | 76-84 | 9.5-10.5 | 160 | -0.1 | 5.8-6.2 |
| BNP-11 | 680-740 | 6.8-7.4 | 400-480 | 5.6-6.0 | 640-800 | 8.0-10.0 | 80-88 | 10.0-11.0 | 160 | -0.1 | 6.0-6.2 |
| BNP-12D | 720-770 | 7.2-7.7 | 440-520 | 5.5-6.5 | 720-880 | 9.0-11.0 | 88-96 | 11.0-12.0 | 160 | -0.1 | 6.1-6.3 |
| BNP-12L | 730-770 | 7.3-7.7 | 368-432 | 4.6-5.4 | 520-640 | 6.5-8.0 | 80-88 | 10.0-11.0 | 120 | -0.12 | 6.0-6.3 |
| BNP-13L | 780-830 | 7.8-8.3 | 400-480 | 5.0-6.0 | 480-640 | 6.0-8.0 | 88-104 | 11.0-13.0 | 120 | -0.12 | 6.1-6.4 |
| Parameter | Unit | Typical Value |
|---|---|---|
| Density | g/cm3 | 5.8–6.2 |
| Binder System | – | Epoxy / thermoset resin |
| Electrical Resistivity | Ω·cm | High, suitable for low eddy-current loss |
| Working Temperature | °C | Typically up to 120 °C, higher options on request |
| Corrosion Resistance | – | Good with resin binder; coating available for harsh environments |
| Dimensional Stability | – | Excellent for net-shape molded parts |
Compression molding supports rings, sleeves, discs, blocks, thin-wall rotors and custom profiles. Net-shape production can reduce secondary machining and improve repeatability in volume manufacturing.
| Item | Capability | Notes |
|---|---|---|
| Outer Diameter / Length | 2–120 mm typical | Larger sizes reviewed by mold and press capacity |
| Wall Thickness | Thin-wall rings available | Confirmed by geometry and mechanical strength |
| Standard Tolerance | ±0.05 mm to ±0.10 mm | Tighter tolerance available after mold review |
| Secondary Features | Groove, step, chamfer, hole, insert, marking | Designed for assembly and magnetization fixture |
BLDC, stepper, spindle and micro motors requiring thin-wall rings, multi-pole patterns and stable rotor balance.
Angle, speed and position sensing products that depend on controlled pole distribution and repeatable waveform output.
Actuators, pumps, HVAC motors and compact sensor systems requiring consistent net-shape magnetic components.
Printers, scanners, appliances and smart devices where compact size, volume consistency and cost control matter.
Powder consistency, binder mixing, granulation, compaction pressure, mold condition and curing profile are controlled by batch.
Surface flux, magnetic moment, pole count, pole angle, phase position and waveform can be measured to project requirements.
OD, ID, thickness, concentricity, runout, flatness, hole and insert position are verified against drawing datums.
Shaft or hub bonding, balancing, polarity marking, material reports and PPAP-style documentation are available on request.
Sintered NdFeB normally provides higher magnetic strength. Compression molded NdFeB offers net-shape production, higher electrical resistivity, dimensional repeatability and flexible multi-pole magnetization.
Yes. Multi-pole magnetization is a core advantage. Pole count, pole pitch, phase reference and waveform tolerance must be agreed before the magnetizing fixture is developed.
The resin binder improves corrosion resistance compared with uncoated sintered NdFeB. Additional coating may still be specified for humidity, salt spray, chemicals or long service life.
Yes. Support can include shaft or hub integration, adhesive bonding, balancing, magnetic waveform inspection, polarity marking and production packaging.
Please provide a drawing or 3D model, target magnetic output, dimensions and tolerances, pole pattern, operating temperature, coating, insert or assembly needs, sample quantity and annual volume.
Send the drawing, magnetic target, pole pattern, operating temperature and assembly requirements. Our team can review BNP grade selection, tooling, magnetization and inspection before quotation.
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