Injection-Molded NdFeB Magnet
注塑钕铁硼（NdFeB）磁体
Injection-molded NdFeB is a bonded permanent magnet produced by mixing rapid-quenched NdFeB magnetic powder with a thermoplastic binder (PA12 nylon or PPS) and a small amount of processing additives, then injection-moulding the compound directly into finished complex shapes — no sintering, no machining, no finishing waste.
AIC Engineering supplies the IMN series across two binder systems: PA12 nylon for general-purpose applications up to 120 °C, and PPS for elevated-temperature service up to 180 °C. Isotropic grades (IMN-2 / 4 / 6 / 8) cover (BH)max up to 67 kJ/m³; high-coercivity IMN-6H extends Hcj above 1000 kA/m for demagnetisation-resistant motor and sensor applications.
Because the compound flows into the mould cavity, injection-moulded NdFeB enables geometries that compression-moulded or sintered magnets cannot deliver — thin walls, complex 3D forms, integrated shafts and metal inserts, and multi-pole magnetisation in a single step. Dimensional precision is excellent, and parts can be insert-moulded directly with metal or plastic components for one-piece assemblies.
Key Features
Complex Geometries
Thin walls, 3D forms, and integrated inserts — shapes that sintered or compression-moulded magnets cannot deliver.
No Machining, No Waste
Net-shape injection moulding — tight dimensional precision, no finishing scrap, repeatable at high volume.
Two Binder Systems
PA12 nylon for ≤120 °C service; PPS for ≤180 °C elevated-temperature applications.
Insert Moulding & Multi-Pole
Overmould onto metal shafts / plastic carriers; multi-pole magnetisation in a single pulse.
Magnetic Grades
Typical values at room temperature, sourced from the AIC Injection-Molded NdFeB performance data sheet. Representative subset — full IMN-2 / 4 / 6 / 8 / 6H (PA12) and IMN3808 / 4609 / 5303 (PPS) series available on request. * = isotropic.
| Grade | Binder | Remanence Br (mT) | Coercivity Hcb (kA/m) | Intrinsic Hcj (kA/m) | (BH)max (kJ/m³) | Max Op. Temp. (°C) |
|---|---|---|---|---|---|---|
| IMN-4* | PA12 | 400–490 | 247–310 | 573–732 | 28–36 | < 120 |
| IMN-6* | PA12 | 490–570 | 312–382 | 637–796 | 42–56 | < 120 |
| IMN-8* | PA12 | 570–630 | 382–430 | 676–835 | 59–67 | < 120 |
| IMN-6H* | PA12 | 480–560 | 334–398 | 1035–1353 | 40–52 | < 120 |
| IMN4609* | PPS | 500–560 | ≥ 326 | ≥ 795 | 42.9–50.9 | < 180 |
Isotropic grades marked with *. Density: 4.5–6.4 g/cm³ (binder and grade dependent). Multi-pole magnetisation and insert-moulded assemblies available across the range.
Injection-Moulding Process
From compound pellets to finished magnetized parts in a single mould cycle — no sintering, no machining.
- Rapid-quench NdFeB powder (MQ)
- Twin-screw compounding with PA12 / PPS
- Coupling agent & antioxidant dosing
- Pelletising to moulding-grade granules
- Mould tool with insert cavities (if needed)
- Screw plasticisation & injection
- In-mould field alignment (anisotropic option)
- Cooling & ejection — net-shape part
- Pulse magnetizing (single- or multi-pole)
- 100% flux & dimension inspection
- Optional surface coating
- Tray / tape-and-reel packaging
Typical Applications
Need a Custom Injection-Molded NdFeB Part?
Send your drawing or sample — our engineers will confirm grade, binder (PA12 / PPS), insert-moulding design, and magnetisation pattern for your application. Mould tooling and samples available.
Discuss Custom RequirementsProduct Manual
Injection-Molded NdFeB Magnet Product Manualbonded-ndfeb-magnet.pdfDownload PDFFrequently Asked Questions
Answers to common questions about our magnets, customisation, ordering and shipping.
- What is an injection-molded NdFeB magnet? +
- Injection-molded NdFeB is a bonded permanent magnet made by mixing rapid-quenched NdFeB powder with a thermoplastic binder (PA12 nylon or PPS) and injection-moulding the compound directly into finished complex shapes — no sintering, no machining, no finishing waste.
- What shapes can injection-molded NdFeB produce? +
- Because the compound flows into the mould cavity, it delivers geometries that compression-moulded or sintered magnets cannot — thin walls, complex 3D forms, integrated shafts and metal inserts, and multi-pole magnetisation in a single step, with excellent dimensional precision.
- What is the maximum operating temperature of injection-molded NdFeB? +
- PA12 nylon compounds are rated to 120 °C for general applications; PPS compounds are rated to 180 °C for high-temperature service. AIC supplies both binder systems in the IMN series.
- How strong is injection-molded NdFeB compared with sintered NdFeB? +
- Injection-molded NdFeB is isotropic with (BH)max up to about 67 kJ/m³ — lower than sintered NdFeB, but it trades raw magnetic strength for far greater shape complexity, tight tolerances, and one-piece insert-moulded assemblies.