Explore our premium grade, surface-treated neodymium permanent magnets designed for complex industrial applications.
Years Industry Experience
Smart Factory Area
Expert Workforces
Annual Output Capacity
Zhejiang Laysun Magnetics Ltd. is a national high-tech leader in manufacturing rare earth permanent NdFeB magnets. Strategically headquartered in Hangzhou, China, with a sprawling 100,000 m² production base in Suining, Sichuan, we focus on engineering complex, high-reliability magnetic configurations that support global transitions to electrification, industrial automation, and deep technological expansion.
Since our founding in 1999, we have integrated advanced metallurgical research, modern powder sintering methodologies, automatic mechanical processing, and state-of-the-art coating treatments into a unified flow process. This vertical integration allows us to supply consistent magnetic properties while maintaining low cost and unparalleled reliability for global supply chains.
How we enhance NdFeB durability under extreme conditions like humidity, high temperatures, and corrosive chemical exposures.
Information Gain Directive: Uncoated sintered NdFeB is highly susceptible to atmospheric moisture oxidation due to its high iron composition. The selection of surface treatment determines the lifespan and operational stability of the final motor assembly or sensor.
| Coating Type | Average Thickness (μm) | Salt Spray Test (SST) Resistance | Max Operating Temp (°C) | Typical Applications |
|---|---|---|---|---|
| Ni-Cu-Ni (Nickel-Copper-Nickel) | 15 - 25 | 48 - 96 Hours | 220°C | Sensors, VCM, Micro-motors, consumer electronics |
| Epoxy (Black/Grey) | 15 - 30 | 240 - 500 Hours | 150°C | Automotive electric water pumps, industrial gearboxes |
| Zinc (Zn) - Cr3+ Passivated | 5 - 12 | 24 - 72 Hours | 180°C | Magnetic separation systems, holding jigs, assembly fixtures |
| Parylene C Coating | 5 - 15 | > 100 Hours | 150°C | Medical implants, ultra-precision aerospace instrumentation |
| Everlube / Teflon | 10 - 25 | > 240 Hours | 200°C | Automotive steering columns, dynamic friction systems |
| Rubber / Plastic Encapsulation | 500 - 1500 | Waterproof / Submersible | 80°C | Marine retrievals, high-moisture sensors, holding hooks |
We perform strict tape tests (cross-cut testing), PCT (Pressure Cooker Test) at 120°C, 2 atm, and 100% relative humidity, and thermal shock cyclings to guarantee coating adhesion integrity across thermal fluctuations.
Electroplating processes generates atomic hydrogen, which can diffuse into the NdFeB alloy causing mechanical failure. Our advanced degassing ovens neutralize hydrogen stress immediately post-plating.
For VCM micro-motors and consumer electronics, we achieve sub-10 micron coatings with tight tolerances, preventing thickness imbalances from affecting stator magnetic air-gap computations.
Our production facilities are split strategically to optimize raw material proximity and shipping efficiency:
As electric motors operate at higher densities, thermal demagnetization becomes critical. Conventional high-coercivity magnets require bulk heavy rare earth (HRE) addition like Dysprosium, which significantly increases costs and compromises the remanence (Br) value.
Laysun Magnetics utilizes **Grain Boundary Diffusion (GBD)** technology. By applying HRE compounds directly to the magnet surface during thermal processing, we diffuse Dy/Tb deep into the grain boundaries. This technique raises intrinsic coercivity (Hcj) by up to 30-40% while preserving a high remanence, reducing thermal susceptibility without excessive raw material costs.
Preserved Remanence
Coercivity Boost
Raw Material Cost
Developing application-specific magnets designed to excel under target industrial operations.
Precision servo-motor permanent magnets with high angular torque density and low inertia. Designed for dynamic articulation controls in multi-axis robotic joints.
Ultra-lightweight high-power-density magnets. Tailored to high rotational brushless outrunners, sustaining constant lift metrics under high ambient altitude pressures.
Sintered NdFeB magnets with high intrinsic coercivity (UH, EH, AH grades). Optimized for traction motors and electric power steering (EPS) systems subject to severe thermal cycles.
Vibration-proof NdFeB assemblies with robust mechanical reinforcement. Ideal for heavy industrial impact wrenches, drills, and angle grinders.
Sub-millimeter disc, block, and arc geometries for haptic engines, micro speakers, MagSafe accessories, wireless chargers, and optical camera actuators.
High-efficiency rotor magnets for variable frequency compressors in refrigerators, inverter air conditioning blowers, and quiet laundry pump systems.
International trade calls for more than just performance. Supply chain, procurement, and engineering departments require robust verification to guarantee legal, safe, and uninterrupted delivery.
Zhejiang Laysun Magnetics complies with IATF 16949 (Automotive standard), ISO 9001, and ISO 14001. We maintain a zero-defect manufacturing environment via advanced statistical process control (SPC).
All magnets and coatings are rigorously tested and certified to be in full compliance with the European Union REACH Regulation, RoHS Directives, and WEEE. We execute strict tracing processes to guarantee conflict-free mineral sourcing.
For air freight deliveries, we design and produce tailored magnetic shielding packaging according to IATA packaging guidelines. This prevents magnetic field leakage, ensuring seamless air transit customs clearances.
Zhejiang Laysun Magnetics Ltd. Certificates
API 6D, API 607, CE, ISO9001, ISO14001, ISO18001, TS (Available upon request).
Answers from our engineering desk to guide your project specifications and prototype cycles.
For custom prototype samples, our design-to-delivery lead time is 7 to 14 days depending on geometric complexity and coating requirements. For batch mass production runs (e.g. 50,000+ units), standard lead times range between 3 to 4 weeks. Tooling time for custom molds (such as specialized arc segments or complex block configurations) typically takes 7-10 days.
For VCM applications in precision optics or computer hard drives, air gaps are minimal, requiring micro-thickness coatings. We recommend multilayer Nickel-Copper-Nickel (Ni-Cu-Ni) plating at a controlled thickness of 12-18 μm, or Parylene C at 5-10 μm. These coatings ensure adequate oxidation resistance while keeping total dimensional deviations within a ±0.03 mm tolerance threshold.
Neodymium demagnetization occurs due to two factors: thermal degradation (exceeding the material's Curie temperature) and exposure to strong opposing external magnetic fields. We resolve this by recommending higher thermal-grade alloys: H (up to 120°C), SH (up to 150°C), UH (up to 180°C), EH (up to 200°C), and AH (up to 220°C). We also implement Grain Boundary Diffusion (GBD) to increase intrinsic coercivity, safeguarding against magnetic collapse.
Our raw material procurement is vertically integrated. Located in Sichuan, our primary alloy processing plant has long-term supply agreements directly with local rare earth mines. We track each production batch by chemical composition analysis (ICP-OES) from metallurgical ingot phase up to finished sintered blocks, ensuring full traceability and protection against price volatility.
Rubber coating acts as a thick, elastic physical barrier. Unlike thin electroplated coatings, rubber protection prevents saltwater, ambient humidity, and acid rains from penetrating the inner porous NdFeB core. It also increases frictional resistance, preventing slipping when applied directly onto smooth metallic surfaces, and dampens mechanical impact forces.
High-quality assemblies, magnetic lifters, and specialized custom-coated magnets.
Quick directory referencing Laysun Magnetics' primary custom categories.
Used in hard drives, linear actuators, and high-frequency speakers.
Radial/diametrical magnetic orientations for rotary encoders.
High magnetic flux stability for wind turbines and generators.
Sintered block blanks for local precision wire cutting operations.
Designed for high alignment force in mobile phone accessories.
Traction motor grade magnets supporting up to AH grade coercivity.
Circular configurations for micro mechanical relays and couplings.
Deep-length magnets optimized for precision medical sensing arrays.
Highly reliable steering sensor magnets with low angle error.
High magnetic remanence for standard acoustic transductions.
Precision shaped rotor segment magnets for wind turbine generators.
Slim thickness and high shear strength magnetic array design.
Laysun Magnetics
