Premium grade industrial enameled wires designed for ultra-efficiency, high thermal stress tolerance, and mechanical robustness.
In the rapidly evolving power generation, high-frequency transformer, and electric vehicle (EV) traction motor sectors, the demand for high-thermal performance windings has surged. Polyesterimide Over-Coated with Polyamide-imide Enameled Aluminum Round Wire, designated globally as EIW/AIW (Class 220), represents the pinnacle of composite insulation engineering. By combining the exceptional dielectric properties of the Polyesterimide basecoat (EIW) with the unmatched chemical resilience, scratch protection, and moisture barrier of the Polyamide-imide (PAI) overcoat (AIW), electrical engineers are unlocked to push thermal limits to 220°C.
Historically, copper was the default medium for motor stators and coils. However, modern lightweight initiatives and the raw material cost fluctuations of non-ferrous metals have positioned high-purity electrical aluminum (grade EC-1350, conductivity ≥ 61% IACS) as the standard alternative. Crucially, EIW/AIW aluminum round wire minimizes the overall inertia of moving coil applications and provides substantial weight reductions (up to 50% relative weight reduction compared to copper configurations), translating directly into system efficiency gains.
A breakdown of thermal, chemical, and physical parameters comparing standard EIW against double-coated EIW/AIW aluminum wire.
| Property Parameter | Polyesterimide Single Coat (EIW - Class 180) | EIW/AIW (Class 220) Enameled Aluminum Wire | Testing Standard Method |
|---|---|---|---|
| Thermal Index | 180°C | 220°C | IEC 60172 / ASTM D2307 |
| Overload (Cut-through) Temp | ≥ 300°C | ≥ 400°C | IEC 60851-6.3 |
| Thermal Shock Tolerance | 200°C (No Cracking) | 240°C (No Cracking) | IEC 60851-6.1 |
| Dielectric Breakdown Voltage | ≥ 4.0 kV | ≥ 8.0 kV (Thickness Grade 2) | IEC 60851-5.4 |
| Chemical & Solvent Resistance | Standard (Affected by strong acids/bases) | Outstanding (Resistant to solvents & refrigerants) | IEC 60851-4.3 |
| Pinhole Test | ≤ 5 per 15m | 0 (Highly Uniform Paint Film Coating) | IEC 60851-5.2 |
Suzhou Daiming Electrical Materials Co., Ltd. is a leading manufacturer of high-quality enameled wires: enameled aluminum wires, enameled copper wires, and enameled copper-clad aluminum wires. Situated on a sprawling 258,333.33 ft² site, our advanced production facility houses 30 state-of-the-art production lines. This robust infrastructure enables us to maintain a stable and high-volume output, ensuring consistent supply to meet global market demands. With strict quality control at every stage, from raw material inspection to final product testing, we uphold the highest industry standards, guaranteeing the durability and performance of our enameled wires.
To achieve Class 220 thermal grades, Daiming uses specialized vertical enamel towers configured with multi-pass application systems. High-precision dies apply up to 24 separate layers of insulating varnish, followed by high-velocity hot air curing in automated temperature-controlled zones. Real-time laser outer-diameter checks guarantee that tolerance variations are kept within ±0.001mm. This advanced process controls ensure that our EIW/AIW wires maintain mechanical flex integrity and avoid cracks, even under severe mechanical stress during winding.
Our supply chain resilience relies heavily on integrating raw material sourcing with direct delivery channels. Suzhou Daiming sources high-purity aluminum rods directly from first-tier national smelters, mitigating the supply shocks that commonly affect smaller manufacturers. This guarantees that global B2B procurement managers receive reliable delivery schedules, consistent electrical conductivity, and competitive pricing.
Why Tier-1 global industrial companies select Suzhou Daiming as their long-term magnet wire partner.
Each roll of EIW/AIW enameled wire undergoes strict inline testing, ensuring a uniform insulation layer with superior adhesion and mechanical toughness.
Double insulation prevents breakdown under massive thermal shocks and cut-through pressures, keeping electrical equipment safe at temperatures up to 220°C.
We accommodate customized conductor diameters and specific enamel thickness grades (Grade 1, 2, or 3) to precisely match your machine specifications.
With 30 state-of-the-art production lines operating continuously, we guarantee short lead times and stable supply chains, even for high-volume orders.
Our enameled wires are engineered for highly efficient, energy-saving motors, directly contributing to carbon-reduction initiatives worldwide.
Our key team members have over ten years of industry experience and are proficient in enameled wire characteristics, international standards, and advanced process flows.
Enabling thermal durability, low energy consumption, and high operational safety across primary electrical fields.
The global magnet wire sector is undergoing major transformations driven by electric mobility (800V powertrain architectures) and energy efficiency regulations (such as IEC IE4/IE5 standards). Traditional enameled wires face insulation challenges like partial discharges and high-frequency skin effect losses under fast rise-time switching pulses.
Daiming’s technical roadmap centers on next-generation insulation engineering, including:
Because aluminum enameled round wire is highly recyclable and significantly lighter than copper alternatives, its adoption in high-volume industries like automotive and HVAC helps reduce shipping weights and operational fuel consumption. Our R&D division is focused on optimizing these physical properties to support global sustainability targets.
Ensuring compliance with international technical specifications and environmental regulations.
Our EIW/AIW enameled round wires are manufactured in strict compliance with IEC 60317-25 and NEMA MW 35-C directives, ensuring seamless drop-in integration with automated production equipment worldwide.
All raw materials and insulation varnishes used are fully certified under RoHS 3.0 and REACH protocols, ensuring compliance with strict environmental regulations for export to Europe, North America, and East Asia.
We provide localized technical assistance and logistics management. All shipments include detailed test certificates (MTRs), spool dimension parameters, and protective, ocean-safe packaging to prevent moisture ingress during shipping.
Technical answers to common questions about EIW/AIW enameled aluminum wire sourcing, application, and engineering properties.
Updates on technology, shipments, and global market trends from Daiming Electrical.
Explore our complete range of enameled conductor lines, including flat wires and transposition systems.
