Polyurethane Enameled Copper Wire Self Bonding 0.040mm Ultra Fine Grade 3 Insulation

Our 0.040mm 3SBUEW is a ultra-fine self-bonding enamelled copper wire, engineered with a triple-layer polyurethane (3UEW) base insulation and a high-performance self-adhesive layer. Designed for micro-miniaturization, high-density winding, and direct soldering, it delivers exceptional dimensional stability, mechanical strength, and electrical reliability for the most demanding precision applications.

• Ultra-Precise Dimensional Control
  • Tight tolerance: Unilateral deviation ≤ 0.001mm; CPK ≥ 1.33 for consistent mass production.
  • Exact 0.040mm conductor diameter; minimal diameter fluctuation for perfect winding alignment.
• Superior Mechanical Properties
  • High elongation & tensile strength: Reduces breakage in high-speed winding; excellent flexibility for tight coils.
  • Enhanced abrasion resistance: 1.3× higher than standard JIS requirements; scratch-resistant coating protects during processing.
• Excellent Electrical & Thermal Performance
  • Thermal class 155°C (F-class): High softening breakdown temperature; stable performance under overload.
  • Direct solderable: Low-temperature soldering at 300–340°C; clean laser/mechanical stripping ensures solder yield.
  • High insulation resistance, corrosion resistance, and radiation resistance for harsh environments.
• Reliable Self-Bonding
  • Activated by heat (110–220°C) or solvent; forms strong, rigid coils without additional adhesives.
  • Consistent bonding strength across all specifications; ideal for integrated molded inductors.

• Customized Single-Head Production: High efficiency and exceptional dimensional stability; equipped with:
  • HVC (High Voltage Continuity) pinhole monitoring: Ensures coating integrity.
  • 360° laser diameter monitoring: Real-time precision control for zero defects.
• Strict Quality Control: 100% inspection for dimensions, insulation, and bonding performance; batch traceability for reliability.

Perfect for high-precision, space-constrained devices requiring micro coils, direct soldering, and high stability:

• Micro motors & linear motors
• Integrated molded inductors
• High-end speakers & audio devices
• Medical electronics & intelligent sensors
• Laser radars & precision instruments
• AI electronics & aerospace components

• JIS / IEC / NEMA compliance guarantees global quality recognition.
• Ultra-precise dimensions minimize winding errors and maximize yield.
• Dual-layer protection (insulation + self-bonding) ensures long-term reliability.
• Direct solderability simplifies assembly and reduces production costs.

Q2.What fields are your productsmainly used in?

A :We mainly produce ultra-fine enameled wire. Our products are widely used in automobiles, new energy, electric power, communication, home appliances, and other fields as winding coils for motors, generators, transformers, and other equipment. We also cooperate with famous brands such as Huawei, Xiaomi, BYD Foxconn, and so on.

Q3.Do you have your own product design?

A :Yes. We can design and improve materials, processes, and performance to meet customer process needs and winding requirements.

Q4.If we provide materials, can you do the secondary processing? What other services can you provide?

A :If it meets the requirements of the production process, we can assist in secondaryprocessing.① Besides mass production, we can also provide customized production in small quantities with multiple specifications.② We can provide technical support according to the customer's product requirements, to assist the customer in completing the research and development of new products.

Q5.Where is your factory located? How far is it from Guangzhou/Beijing/Shanghai/Shenzhen?

A :We have 2 production bases: ① Xianning base: close to Wuhan, in the center of China. The time to Guangzhou, Beijing, Shanghai, and Shenzhen by high-speed rail is about 3-4 hours; the airplane is about 1.5 hours; ②Dongguan base: close to Guangzhou and Shenzhen, farther away from Beijing and Shanghai, about 4 hours by airplane.