Engineered to comply with IEC 60317, NEMA MW 79-C, and NEMA MW 80-C specifications, delivering outstanding solderability and breakdown voltage.
Why the integration of polyurethane chemistry (UEW) and high-conductivity copper/aluminum substrates represents the pinnacle of modern electromagnetic winding designs.
Polyurethane (PU) covered enameled wire, widely recognized under the industry standard shorthand UEW, is highly valued for its chemical property of thermal decomposition at temperatures between 360°C and 480°C. In high-speed manufacturing environments, stripping insulation layers mechanically or chemically before soldering adds time, cost, and risk of conductor thinning. Polyurethane insulated winding wires eliminate this preprocessing step. The insulation layer melts cleanly during direct soldering bath exposure or automated spot welding, providing clean, residue-free solder points with maximum electrical connectivity.
This self-fluxing characteristic, combined with the excellent dielectric properties of polyurethane films, makes it a critical material for manufacturing precision miniature coils, high-frequency flyback transformers, solenoid valves, automotive relay components, and high-frequency communication electronics.
Selecting the conductor substrate is a crucial design decision for system engineers. Historically, copper has been the default material because of its exceptional electrical conductivity (100% IACS) and superior mechanical tensile strength. However, the rise of EV drivetrains, lightweight consumer electronics, and high-power utility transformers has created a demand for high-performance enameled aluminum wire.
Engineered to comply with global standards, including IEC, NEMA, and JIS benchmarks.
| Property Parameter | Polyurethane Copper Wire (UEW/Cu) | Polyurethane Aluminum Wire (UEW/Al) | Test Methods & Standards | |
|---|---|---|---|---|
| Base Conductor | Oxygen-free copper (Purity > 99.97%) | Electrical grade EC Aluminum (1350 series) | ASTM B3, ASTM B233 | ASTM B3, ASTM B233 |
| Thermal Class Options | Class 130 (B), Class 155 (F), Class 180 (H) | Class 155 (F), Class 180 (H), Class 200/220 | IEC 60317 / NEMA MW 75, 79, 82 | |
| Wire Diameter Range | 0.02 mm to 3.00 mm (SWG/AWG specs) | 0.12 mm to 6.00 mm (Round / Flat Profiles) | GB/T 6109 / IEC 60317-0-1 | |
| Direct Solderability Temp | 370°C to 450°C (Direct dip, no stripping) | Requires specialized flux or mechanical strip | IEC 60851-4 / Self-soldering test | |
| Dielectric Breakdown Voltage | Up to 12.0 kV (Depending on Film Grade 1, 2, 3) | Up to 9.5 kV (For Class H insulation thickness) | IEC 60851-5 (Cylinder method) | |
| Elongation Rate (%) | > 30% (Standard testing sizes) | > 15% to 25% (Soft temper status) | ASTM B566 / IEC 60851-3 | |
| Springback Angle | < 5° (Highly flexible forming characteristics) | < 3° (Extremely low recoil index) | JIS C3003 Section 7 |
Suzhou Daiming Electrical Materials Co., Ltd. is a global leader in the engineering, synthesis, and distribution of high-performance enameled magnet wires. Our product portfolio includes premium-grade enameled aluminum wires, enameled copper wires, and advanced copper-clad aluminum enameled wires (CCA).
We operate out of a modern 258,333.33 sq. ft. manufacturing facility equipped with advanced, automated vertical and horizontal enameling systems. Our multi-stage extrusion, drawings, and continuous inline testing equipment ensure our magnet wires maintain precise insulation thickness, excellent flexibility, and consistent resistance profiles. By working closely with international distribution partners, we supply critical components to motor winding companies and electrical assembly factories around the world.
Our magnet wire is designed and tested to perform reliably under high operating temperatures and high electrical stress.
We use automated laser-micrometer sizing dies during enamel application to ensure uniform paint distribution, consistent concentricity, and reliable dielectric performance across the entire spool.
Our polyurethane insulation is modified with polyamide or polyimide-imide overcoats to prevent cracking during thermal cycling and high-speed automated winding processes.
We supply magnet wires in round, flat, rectangular, and Continuously Transposed Conductor (CTC) profiles, custom-matched to your electrical current and winding window requirements.
Our 30 high-speed drawing and enameling lines provide a reliable supply of magnet wire, helping global manufacturers maintain consistent production schedules.
Our low-resistance copper and lightweight aluminum magnet wires help improve efficiency and reduce energy losses in next-generation electric motors and transformers.
All Daiming magnet winding wires comply with RoHS and REACH regulations, are UL-certified, and meet international environmental and safety standards.
Our high-performance magnet wires are used in critical applications across many sectors, including automotive systems and power distribution grids.
Stay up to date with updates on overseas shipments, technical articles, and the latest trends in the global enameled wire industry.
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With raw copper prices changing, Copper-Clad Aluminum (CCA) enameled wire offers a cost-effective alternative for coil winders seeking stable materials costs.
Read MoreThe automotive industry's shift toward 800V drivetrain systems has created new requirements for magnet winding insulation. Standard polyurethane films may experience partial discharge and dielectric breakdown when exposed to high electrical stress and rapid voltage rises.
To meet these challenges, our chemical engineers developed corona-resistant magnet wires. By introducing inorganic nano-fillers into the polyurethane chain, we improved the insulation's resistance to high temperatures and electrical stress. Additionally, our new polyimide-imide overcoat options (AIW/UEW) provide reliable protection against thermal overload, extending the service life of motors and generators.
We also focus on optimizing packaging and spool tension. Proper spooling tension helps prevent micro-cracks in the insulation during high-speed winding, ensuring the wire performs reliably in demanding environments.
Get detailed technical answers to common questions about polyurethane covered insulated magnet winding wires.
Select from our specialty enameled copper and aluminum wires designed for industrial applications.
