High-performance winding wire solutions engineered for continuous operations under high thermal, mechanical, and dielectric stresses.
In modern electrical engineering, the demand for magnet wire that can withstand extreme environments is rising. Factors like heavy grid modernization, electric vehicle (EV) growth, and complex industrial automation require wires that can handle severe thermal stresses. High-temperature resistant enameled wires—specifically those rated from Class 180 (H) up to Class 220 (R) and beyond—play a key role in protecting core industrial and electrical systems from breakdown.
As global industries shift toward higher power density and space-saving designs, electrical equipment runs hotter. For instance, in EV traction motors, systems are transitioning from 400V architectures to 800V to allow for faster charging and higher efficiency. This transition exposes the insulation of motor windings to intense partial discharges, transient voltage surges, and extreme heat. Under these conditions, standard enameled wires degrade quickly, leading to premature motor failure. Using advanced insulation resins like polyamide-imide (PAI) and polyimide (PI) is essential to provide the heat shock resistance, mechanical toughness, and dielectric strength needed to keep these systems running reliably.
Additionally, global supply chains are focusing on energy efficiency and material optimization. High-temperature enameled aluminum wire and copper-clad aluminum (CCA) wire are increasingly used alongside traditional copper. These alternatives offer cost savings and weight reduction while maintaining stable electrical performance at high temperatures, making them highly valuable for heavy-duty industrial applications.
Our enameled wires are engineered and manufactured in strict compliance with major international standards, including IEC 60317, NEMA MW 1000, and JIS C 3202. The table below outlines the core properties and insulation profiles of our high-temperature magnet wire classes.
| Thermal Class | Maximum Temperature | Typical Insulation Coatings | Core Applications & Performance Characteristics |
|---|---|---|---|
| Class 130 (B) | 130°C | Polyurethane (PU) / Polyester (PE) | Excellent solderability, ideal for standard small relays, solenoids, and instrument transformers. |
| Class 155 (F) | 155°C | Modified Polyester / Polyurethane + Nylon overcoat | High dielectric properties, standard industrial motors, fractional horsepower motors. |
| Class 180 (H) | 180°C | Polyesterimide (PEI) / Polyurethane (PU-H) | High resistance to heat shock, suitable for heavy-duty power tools and automotive alternators. |
| Class 200 (K) | 200°C | Polyesterimide (PEI) + Polyamide-imide (PAI) overcoat | Excellent chemical resistance to refrigerants and solvents; ideal for hermetic compressors. |
| Class 220 (R) | 220°C | Polyamide-imide (PAI) / Polyimide (PI) | Extreme thermal durability, high scratch resistance, used in aerospace and high-voltage traction motors. |
Choosing the right thermal class involves balancing thermal limits, mechanical protection, and cost. In high-frequency, high-voltage setups, special overcoats like PAI help prevent micro-cracks under thermal cycling, which is key to avoiding insulation breakdown and ensuring long-term reliability.
Based in Suzhou, Suzhou Daiming Electrical Materials Co., Ltd. is a specialized manufacturer of high-quality enameled wires. Our product range includes enameled aluminum wires, enameled copper wires, and enameled copper-clad aluminum (CCA) wires. Our modern production facility covers 258,333.33 sq. ft. and is equipped with 30 state-of-the-art production lines, allowing us to maintain a stable supply and meet high-volume global market demands.
We perform strict quality control at every stage of production, from raw material inspection to final product testing. Our commitment to international standards guarantees the durability, performance, and thermal stability of our products. With over a decade of industry experience, our engineering team provides customized solutions, helping clients choose the right wire diameters, thermal classes, and insulation profiles for their specific applications.
Our products are engineered for demanding industrial environments. Here is how we ensure consistent quality, durability, and reliability:
We use multi-pass die coating and precise curing control to ensure a uniform paint film. This provides excellent adhesion and scratch resistance during high-speed winding.
Our insulation formulas are designed to resist thermal overload and cut-through pressures, preventing short circuits even under sustained stress and temperature peaks.
We offer precision customization across different shapes (round, flat, rectangular), wire diameters, and thermal ratings (from 130°C to 220°C) to fit your project requirements.
Our products are used in core industrial sectors, offering durability, safety, and efficiency where performance is critical.
As electric vehicles, renewable energy, and grid systems evolve, magnet wire technology faces new demands. The industry is moving toward higher voltage classes, higher frequencies, and more compact designs, which require advanced wire engineering to handle these conditions.
Our technical roadmap is designed to address these trends:
By combining raw material quality, advanced testing equipment, and process control, we help global partners build efficient, durable, and reliable electrical systems.
Browse our range of specialized magnet wire solutions, including paper-covered conductors, flat enameled profiles, and transposed systems.
Find technical answers and engineering details for high-temperature resistant enameled wires.