Parylene (poly-p-xylene) is a polymeric conform coating material deposited via a vacuum vaporization process. This coating features uniform thickness, high density, and optical transparency, offering excellent electrical insulation, moisture resistance, and chemical corrosion resistance to meet the protective requirements of components with complex geometries. Depending on molecular structure, it is primarily categorized into N-type, C-type, D-type, and HT-type series to accommodate diverse application conditions.

      Ningbo Yuanchen New Materials Co., Ltd. has integrated parylene vacuum coating technology into the protection system for high-performance NdFeB permanent magnets, launching a series of parylene-coated NdFeB products. While preserving the original magnetic properties of the magnets, these products provide robust insulation and corrosion resistance through a dense coating, making them ideal for high-reliability applications involving miniaturized and irregularly shaped magnets.

Core Technical Features

Vapor Phase Deposition Process with Excellent Conformality

      Utilizing Chemical Vapor Deposition (CVD), active monomers polymerize in-situ on the substrate surface to form a thin film. The coating exhibits superior conformality, capable of covering sharp edges, micro-crevices, internal cavities, and other complex structures, making it particularly suitable for the surface protection of miniature and precision magnetic materials.

Precisely Controllable Film Thickness with Dimensional Accuracy

      The coating thickness can be precisely controlled within the range of 0.1–100 μm with excellent uniformity. Its colorless and transparent nature ensures that product appearance remains unchanged while meeting strict dimensional tolerances required for precision magnetic components.

High Dielectric Strength for Reliable Electrical Insulation

      Parylene coatings exhibit high dielectric strength (typical value >5,000 V/mil*), significantly enhancing the electrical safety of electronic components. Small soft-magnetic cores treated with this coating demonstrate outstanding performance in withstand voltage tests, satisfying high-voltage insulation requirements.

Chemical Corrosion Resistance & Barrier Protection

      The coating features low water vapor permeability and excellent chemical inertness, providing resistance to various acids, alkalis, solvents, and salt spray environments. Magnets treated with parylene show significant improvement in neutral salt spray test performance and acid/alkali resistance. Additionally, the coating helps mitigate high-temperature oxidation, improving thermal stability and reducing irreversible flux loss at elevated temperatures.

(Note: Specific corrosion resistance duration depends on coating thickness, type, and testing conditions; please refer to actual test data.)

Low Friction Coefficient for Mechanical Protection

      The smooth coating surface offers a low coefficient of friction (~0.25*), reducing wear during assembly and operation. This protects enameled wire insulation layers and improves winding process yield rates.

Environmentally Friendly Clean Production

      The coating is deposited at room temperature without solvents or additives, generating no hazardous waste liquid. It complies with RoHS, REACH, and other environmental regulations, representing a clean surface treatment process.

Technical Capabilities & Qualifications

      Founded in 2003, Ningbo Yuanchen New Materials Co., Ltd. is a National High-Tech Enterprise with a fully integrated industrial chain encompassing R&D, manufacturing, surface treatment, magnetizing, packaging, and logistics of magnetic materials.

      Magnet Performance: Independently developed high-performance NdFeB magnets achieve remanence (Br) up to 15 kGs and intrinsic coercivity (Hcj) up to 35 kOe*.

      Surface Treatment: Operates an annual production capacity of 1,500 tons of NdFeB magnets, equipped with over ten surface treatment processes including zinc plating, nickel plating, phosphating, electrophoresis, and parylene vacuum coating.

      Management System Certification: Certified to IATF 16949, ISO 9001, ISO 14001, ISO 45001, QC 080000, and other management system standards.

Application Areas

      Micro Motors: Provides inter-turn insulation, reduces eddy current losses, and supports motor miniaturization and efficiency improvement.

      Consumer Electronics: Protective coating for speakers, motors, and camera modules in smartphones, TWS earbuds, and wearable devices.

      New Energy Vehicles (NEV): Corrosion resistance and electrical insulation for sensors, drive motors, and other critical components.

      Medical Devices: Compliant with ISO 10993 biocompatibility testing requirements*; suitable for precision magnetic assemblies in medical equipment.

      Aerospace & Industrial Control: High-reliability magnetic components designed for harsh operating environments.

      Electronic Components: Insulation and moisture protection for high-frequency transformers, inductors, and magnetic sensors.

Customization Services

      Yuanchen New Materials offers customized solutions for parylene coating types (including N/C/D/HT series) and film thickness. Leveraging our integrated manufacturing capabilities, we provide comprehensive technical support throughout the entire process—from magnet selection and structural design to final surface treatment.

      Yuanchen New Materials – Dedicated to Magnetic Material Innovation, Delivering Reliable Magnetic Solutions.