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Understand the science behind high-temperature insulation coatings that secure critical energy pathways.
Polyesterimide (PEI) coating represents a major leap forward in polymer insulation chemistry. Characterized by high thermal stability, this material combines the excellent mechanical toughness of ester linkages with the exceptional thermal degradation resistance of imide rings. As a primary insulation system for round copper and aluminum magnet wires, PEI coatings exhibit thermal performance classifications ranging from Class 180 (H) to Class 200 (K).
Under high-voltage and high-current stress conditions, conventional enamel coatings deteriorate due to localized thermal spikes. The presence of the imide groups inside the polymer backbone of Polyesterimide prevents chains from sliding, significantly enhancing the wire’s resistance to thermoplastic flow up to temperatures exceeding 300°C. Additionally, it offers exceptional resistance to common industrial solvents, synthetic refrigerants, and cooling oils, making it the preferred choice for hermetic motor designs and heavy-duty transformers.
Polyesterimide-coated magnet wires are rigorously tested for consistency across thermal, chemical, and electrical parameters:
A global leader in developing, extruding, and coating high-integrity electrical conductor systems.
Operating from a sprawling 258,333.33 ft² manufacturing base in Suzhou, China, Suzhou Daiming Electrical Materials Co., Ltd. has established itself as an elite supplier of enameled aluminum wires, enameled copper wires, copper clad aluminum (CCA) enameled wires, and complex transposed conductors (CTC).
Our state-of-the-art facility integrates 30 advanced production lines, designed to achieve maximum extrusion and drawing consistency. By coupling high-speed vertical and horizontal enameling equipment with inline laser dimensional controls, we ensure that every micron of the polyesterimide coating complies with rigorous global tolerances. Our engineers leverage more than a decade of industry expertise to deliver customization across wire diameters, temperature configurations, and spool sizes.
Unlocking value through vertical integration, rigorous testing standards, and geographic logistics superiority.
By establishing deep relationships with local electrolytic copper cathode and high-purity aluminum rod refiners in China, we insulate our global clients from volatile raw material fluctuations. Our integrated purchasing model optimizes cost configurations while ensuring raw chemical purity.
Our facility utilizes closed-loop coating dies and computerized curing ovens. This ensures a concentric, defect-free lacquer layer of polyesterimide, which is continuously monitored for pinholes, concentricity, and mechanical flexibility.
From raw rod chemical analysis using emission spectrometers to springback testing, peel tests, and breakdown voltage assays, every shipment is verified in our ISO accredited quality testing lab before shipping worldwide.
How specialized polyesterimide coated round wire drives efficiency across high-demand electrification sectors.
In modern automotive engineering, traction motors require magnet wires that withstand intense heat and high-frequency voltage spikes generated by modern inverters. Polyesterimide coated wires provide the requisite thermal threshold (up to 200°C) and partial discharge resistance. This translates to increased torque density, less heat output, and space-saving motor designs.
Power grid and distribution transformers must manage persistent overload conditions without insulation breakdown. Enameled wire with PEI insulation maintains high mechanical integrity and insulation resistance even under intense vibration and constant operating temperatures, preventing turn-to-turn short circuits.
Wind power and marine installations expose generating components to cyclical thermal shifts, salt mist, and mechanical stress. Our Class 180 and Class 200 enameled wires prevent moisture ingress and mechanical fatigue, enhancing turbine lifetime and slashing maintenance expenses.
Compressors in refrigerators, air conditioning units, and high-performance industrial pumps operate in harsh hermetic environments containing oils and refrigerants. Polyesterimide is chemically inert to chemical solvents and freon, preventing degradation over decades of service.
Reference guide for choosing the correct thermal class, base metal, and dimensional parameters.
| Property | Copper Base Winding Wire | Aluminum Base Winding Wire | Testing Standard Reference |
|---|---|---|---|
| Wire Diameter Range | 0.08 mm – 5.00 mm | 0.20 mm – 6.00 mm | IEC 60317 / NEMA MW 1000 |
| Thermal Class Options | Class 180 (H) / Class 200 (K) | Class 180 (H) / Class 200 (K) | ASTM D2307 |
| Insulation Type | Polyesterimide (PEI) / Overcoated PEI+PAI | Polyesterimide (PEI) / Overcoated PEI+PAI | Polymer Chemistry Assay |
| Elongation Rate | ≥ 30% to 40% (Diameter Dependent) | ≥ 15% to 30% (Diameter Dependent) | IEC 60851-3 |
| Springback Angle | ≤ 5 Degrees (For thick dimensions) | ≤ 6 Degrees | IEC 60851-3 |
| Cut-Through Temp | ≥ 320°C | ≥ 340°C | IEC 60851-6 |
Simplifying the supply chain process for global procurement teams and engineering specifiers.
As a global magnet wire supplier, we know that standard compliance is non-negotiable for Tier 1 automotive and industrial OEMs. Our manufacturing processes conform strictly to IATF 16949, ISO 9001, and ISO 14001 standards. Every batch of enameled wire is accompanied by material test reports (MTRs) certifying dimensional precision, electrical breakdown resistance, and chemical consistency.
Our products strictly adhere to environmental regulations such as RoHS (Restriction of Hazardous Substances) and REACH. In terms of shipping and handling, we supply custom packaging solutions including tapered plastic spools (PT-4, PT-10, PT-25, PT-90, PT-200) and cylindrical spools, enclosed in heavy-duty cardboard boxes and secured on export-grade wooden pallets to prevent damage during transit.
Browse our complete list of specialty enameled wires designed to meet varying electrical, thermal, and weight specifications.
Get answers to common technical, commercial, and engineering questions regarding polyesterimide coated magnet wire.