Engineered for extreme thermal thresholds, superior chemical compatibility, and precise mechanical tolerances.
In modern electrical insulation systems, magnet wires coated with Polyesterimide (PEI) resins represent the absolute baseline for high-reliability industrial operations. Structurally derived by introducing stable imide rings into the backbone of a polyester polymer chain, Polyesterimide balances the exceptional economic feasibility of polyester with the premium, high-temperature dielectric performance characteristic of polyimides.
This hybrid chemical makeup establishes a thermal index of Class H (180°C) and Class C (200°C - 220°C), making it the prime choice for winding and tie configurations in demanding magnetic circuits. Whether utilized as standard round enameled wire, shaped flat conductors, or transposed cable matrices, PEI acts as a critical electrical barrier. The material provides outstanding resistance to heat shock under heavy overloads, maintains consistent breakdown voltage limits, and offers superior protection against aggressive industrial solvents and synthetic refrigerants.
The condensation polymer structure of PEI incorporates cyclic imide rings which drastically limit chain movement at elevated temperatures, providing unmatched physical endurance against thermal degradation and mechanical elongation.
Engineered to pass rigorous heat-shock examinations exceeding 200°C-240°C, ensuring that tight winding radiuses and mechanical stresses do not compromise insulation integrity during manufacturing or heavy cycling.
Undergoing rigorous verification under IEC, NEMA, and ASTM standards to support the engineering demands of global OEMs.
Maintains solid structural integrity at continuous operating temperatures ranging from 180°C to 220°C. Resists thermal decomposition, ensuring safety and longevity in high-amperage applications.
Provides extremely high breakdown voltage metrics, even under mechanical stress. Optional modification with nano-silica improves long-term corona discharge performance in inverter duty applications.
Features low friction surfaces for automated, high-speed winding machinery. Highly resistant to transformer oils, organic solvents, and modern refrigerants like R134a and R410a.
We are a leading, high-volume manufacturer of advanced enameled wire products, including enameled aluminum wires, enameled copper wires, and specialized enameled copper-clad aluminum wires (ECCA). Operating from a state-of-the-art facility spanning 258,333.33 ft², we have committed ourselves to engineering insulation materials capable of handling tomorrow's electrification challenges.
Our infrastructure hosts 30 advanced production lines, allowing for stable, high-capacity outputs that fulfill the logistical and technical requirements of multinational engineering corporations. By executing meticulous quality checks from incoming wire rod assays to final precision layer testing, Suzhou Daiming ensures that every shipment meets critical international guidelines.
Advanced Production Lines
Facility Footprint (Sq. Ft)
Cooperating Countries
Batch Traceability & Testing
Navigating raw material dynamics, supply chain stabilization, and design-in customization.
With high fluctuations in commodity indices (LME / SHFE), global procurement managers must implement forward pricing models and volume commits. We provide structured supply contracts linked directly to metal indices, ensuring clear, predictable billing structures. Additionally, our high-volume production schedules act as a buffer, allowing us to absorb short-term supply chain variations and deliver continuous batches on-site without schedule slippage.
As copper prices experience volatility, copper-clad aluminum (ECCA) insulated wires emerge as a vital alternative. Incorporating an aluminum core with a thin outer layer of high-purity copper, ECCA delivers a substantial weight reduction of up to 40% compared to pure copper, while maintaining excellent conductivity and solderability. When coated with high-grade polyesterimide insulation, ECCA wires offer design engineers a highly efficient, weight-optimized path to control BOM budgets.
Polyesterimide insulated wires play a foundational role in many of today's key industrial systems.
Excellent mechanical properties allow our wire to withstand high mechanical forces during high-speed, automated stator coil winding, while maintaining thermal stability under continuous workloads.
Our Continuously Transposed Conductors (CTC) use flat wire configurations to optimize slot fill factor, lower copper losses, and handle high electrical stresses in utility grids.
Modified PEI layers with PAI overcoats offer the protection required for 800V drive systems, shielding motor coils from high-frequency inverter voltage spikes.
Used in high-duty compressors for cooling systems. Provides reliable resistance to chemical solvents and synthetic refrigerants, preventing premature insulation failure.
Industrial electrification is shifting toward higher power densities and smaller physical footprints. For magnet wire insulation, this demands materials that can handle higher thermal loads without suffering structural degradation or micro-cracking.
Our research and development focus is directed toward three core areas:
Broaden commercial availability of corona-resistant enameled wires for automotive motors and key clean energy components.
Upgrade all Suzhou Daiming facilities with advanced closed-loop solvent combustion systems to reduce carbon emissions.
Release next-generation magnet wire systems designed to operate safely in SiC-driven high-frequency motor setups.
Answers to common engineering questions regarding the application and supply of Polyesterimide-insulated wires.
From paper-covered flat configurations to continuously transposed conductors, we deliver dependable quality.
