Company Profile
Hangzhou Hongtong Wire & Cable Co., Ltd
Hangzhou Hongtong Wire & Cable Co., Ltd., strategically positioned in China’s Yangtze River Delta innovation hub with integrated campuses in Hangzhou, Zhejiang and Xuancheng, Anhui, stands as a leading specialist in high-performance coated magnet wires. Established in 2004 with full ownership of 76,000 sqm industrial land, our vertically integrated ecosystem delivers over 20,000 tons annually of precision-engineered electromagnetic solutions.
The company operates three advanced R&D platforms – UL-certified Laboratory (File E326617), Automotive-Grade Wire Development Center, and Composite Insulation Technology Institute – supported by 17 patented manufacturing processes that enable micron-level tolerance control and extreme-environment resilience.
Our UL-recognized product lines, including ultra-fine enameled wires for medical micro-devices, skin-effect-minimizing Litz wires for 5G infrastructure, and film-insulated flat wires for aerospace systems, drive technological breakthroughs across next-generation EVs (32% market penetration in powertrains), FDA-compliant medical robotics, and industrial automation. With certifications spanning IATF 16949, RoHS, and REACH, Hongtong supplies global leaders including Sanhua, Holley Group, and Mindray Medical from dual manufacturing centers in East China, supported by logistics hubs in Shanghai and Ningbo that enable certified solution delivery to 18 countries across Asia, Europe, and North America – powering progress from smart factories to orbital satellites with mission-critical connections.
Chairman’s Speech
For two decades, Hongtong has pioneered China’s specialty enameled wire industry, evolving from a local workshop founded in 2004 to a nationally recognized leader in insulated conductive solutions. Our journey embodies the dedication of engineers and technicians who perfected micron-level coating technologies, enabling breakthroughs in automotive electronics, high-efficiency motors, and medical micro-devices.
We uphold a triple commitment: To empower employees through continuous skills advancement, to serve communities through eco-conscious manufacturing, and to advance China’s industrial modernization through precision-engineered exports. This balanced approach fosters sustainable partnerships across our value chain.
As China accelerates its “Manufacturing 2025” and “Dual Carbon” goals, Hongtong embraces the shift from volume production to technology-led value creation. We recognize that innovation in insulation systems – not scale – will define global competitiveness, and are channeling resources into three pillars: automated precision coating systems, green solvent-free formulations, and industry-academia R&D alliances.
Moving forward, we will deepen collaborations with automotive and medical sector leaders, expand our UL-certified solution portfolio, and strengthen quality management to IATF 16949 excellence standards. Through these actions, Hongtong pledges to be the indispensable insulation partner for China’s high-tech manufacturing ecosystem.
Chairman: Li Xiao
Development milestones of
Hangzhou Hongtong Wire & Cable Co., Ltd.
Why Choosing Hongtong?
Hongtong invests in micro-fine and specialty wire technologies, driving continuous improvements and enabling higher performance standards.
With modern production lines and automated monitoring, we achieve precision and efficiency in every process.
Our production process is fully monitored through a digital quality management system. Every spool is assigned a unique barcode for complete traceability, ensuring stable performance and reliable supply for every customer order.
All products undergo strict inspection for dimensions, coating, and performance, certified under UL, ISO9001, IATF16949, RoHS, and REACH.
Hangzhou HQ and Xuancheng plant cover over 50,000㎡ with advanced facilities.
20+ enameled wire lines, 200+ drawing machines, monthly specialty wire output exceeding 100 tons.
High capacity and efficient production planning guarantee reliable delivery.
From enameled round wires to litz and alloy wires, we offer diverse choices to meet different technical needs.
Our technical team provides customized solutions, transforming ideas into practical, high-performance products
Every wire is manufactured under strict quality systems and tested for durability, insulation, and thermal resistance — ensuring dependable operation in critical applications worldwide.
We manage every step, from copper sourcing to final testing, guaranteeing high standards.
Flexible production scheduling enables fast response to customer demand and on-time global delivery.
Every order is supported by strict process traceability and standardized packaging solutions, ensuring customers receive reliable products with the same high quality every time.
Enameled Wire FAQs
Enameled copper wire, also referred to as magnet wire, consists of a copper conductor insulated by a thin, durable layer of polymer coating. Typical insulating materials include polyester, polyurethane, polyamide, or polyimide, each selected for specific thermal and mechanical properties.
The insulation serves two primary purposes:
• Provides electrical isolation between conductor turns, preventing short circuits
• Protects against environmental factors including moisture, heat and mechanical abrasion
This type of wire is manufactured through multiple precision coating and baking processes that ensure uniform insulation thickness and consistent performance characteristics essential for electromagnetic applications.
Enameled copper wire finds extensive application in electromagnetic devices due to its excellent conductivity and insulation properties. Primary applications include: • Motor and transformer windings, where it enables efficient energy conversion; • Inductors and coils in electronic circuits for energy storage and filtering; • Solenoids and actuators for electromechanical control systems; • Generators, alternators and various electrical apparatus requiring reliable insulated conductors; The specific wire type—including single solid conductors or Litz wire constructions—is selected based on application requirements such as frequency, current capacity and space constraints. Manufacturers typically offer various grades differentiated by thermal class, dielectric strength and mechanical durability to meet different technical specifications.
Yes, the copper core of enameled wire is highly conductive, serving as an excellent conductor material with superior winding capabilities. The primary role of the thin, durable enamel insulation is to prevent electrical contact between adjacent turns or with external components, thereby preventing short circuits while maintaining optimal electrical performance. This combination makes it an indispensable component in a wide array of electromagnetic applications, including transformers, motors, generators, inductors, speakers, and various precision electronic devices. Manufacturers, such as those producing oxygen-free and low-oxygen copper magnet wires, utilize multiple coating and baking processes to apply synthetic resin insulation—like polyurethane or polyimide—ensuring the wire meets stringent technical standards for longevity and efficiency.
Enameled wire consists of two fundamental parts:
• Conductor: Typically made from high-purity copper, such as oxygen-free copper (OFC) or low-oxygen copper, which is annealed to achieve a smooth surface, uniform roundness, and excellent flexibility. The conductor must adhere to strict international standards with no defects.
• Insulation: The bare copper is coated with multiple layers of a continuous, smooth synthetic resin film through a series of painting and baking processes. This insulation is free from foaming and impurities. Common insulating materials include, in order of increasing temperature resistance: polyvinyl formal (Formvar), polyurethane, polyamide, polyester, polyester-polyimide, polyamide-polyimide (amide-imide), and polyimide.
The selection of the specific conductor and insulation combination is critical and is determined by the required thermal class, mechanical properties, and the final application’s technical specifications, which guides the manufacturing process.
Litz wire (from the German Litzendraht, meaning “braided wire”) is a specialized type of stranded enameled wire designed to minimize power losses at high frequencies.
Unlike ordinary stranded wire, Litz wire consists of multiple individually insulated thin strands that are woven or bundled in a specific pattern. This construction ensures that each strand moves equally through the entire cross-section of the conductor, thereby reducing the “skin effect” and “proximity effect” that cause increased AC resistance at higher frequencies.
Its primary applications include:
• High-frequency transformers and inductors for switch-mode power supplies (SMPS)
• Wireless charging coils
• RF antennas and resonant circuits
• Induction heating equipment
The choice between single solid enameled wire and Litz wire is primarily driven by the operating frequency and the need to optimize efficiency.