Product Description
Silk-covered wire refers to an electromagnetic wire formed by wrapping one or two layers of natural or synthetic fibers over an enameled stranded wire. Common types include polyester fiber-covered wire, nylon fiber-covered wire, and self-bonding fiber-covered wire (acetone-bonded or hot-air bonded).
| Type |
Silk Layer Material |
Processing Method |
Key Properties |
| USTC |
Polyester, Polyamide |
Single-layer silk wrapping |
Heat resistance class 130 |
| UDTC |
Polyester, Polyamide |
Double-layer silk wrapping (tight, nocopper exposure) |
Heat resistance class 130 |
| UDATC |
Polyester + AcetateFiber |
Double-layer silk wrapping (tight, nocopper exposure) |
Heat resistance class 130, acetone solvent bonding, strong adhesion, rapid coil fomming |
| UDHTC |
Polyester + PolyamideFiber |
Double-layer silk wrapping (tight, nocopper exposure) |
Heat resistance class 110, hot-air bonding (110-140C), strong adhesion, rapid coil forming.environmentally friendly |
Features & Advantages:
1:Excellent high-frequency resistance.
2:Neat coil winding arrangement with high Q-factor.
3:Superior to enameled stranded wires: Silk protection minimizes wire damage during winding, ensuring enhanced electrical performance.
4:Self-bonding silk-covered wires offer high adhesion, rapid forming, and eco-friendliness (hot-air bonded type).
5:Excellent direct solderability with minimal residue.
6:Customizable production based on client requirements (wire diameter, structure, etc.).
Applications of Silk-Covered Wires:
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High-Frequency Electronics: RF inductors, high-frequency transformers, 5G communication modules.
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New Energy Systems: Solar inverters, EV charging coils, wind turbine generators.
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Consumer Electronics: Wireless chargers, drone motors, smart device coils.
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Industrial Equipment: Welding machine coils, motor windings, solenoid valves.
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Medical Devices: MRI system coils, electrosurgical tools, diagnostic equipment.
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Aerospace & Defense: Avionics wiring, satellite communication components, radar systems.
Key Advantages Highlighted:
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Optimized for high-frequency resistance and minimal skin effect loss.
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Widely adopted in extreme environments (high temperature/vibration).
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Compliant with automotive (AEC-Q200) and medical (ISO 10993) standards.
Representative specifications and parameters:
| Specification |
AWG Gauge |
Conductor Diameter (mm) |
Conductor Diameter (inches) |
Number of Strands |
Stranding Type |
Max. Overall Diameter (mm) |
Max. Overall Diameter (inches) |
Rated Voltage (V) |
Max. DC Resistance (Ω/km) @20ºC |
| UDATC 2UEW 155 0.032*15 |
44 |
0.032 |
0.00126 |
15 |
15 |
0.24 |
0.00945 |
380 |
1605 |
| UDATC 2UEW 155 0.400*60 |
26 |
0.400 |
0.0157 |
60 |
60 |
4.33 |
0.1705 |
2300 |
2.40 |
| UDATC 2UEW 155 0.071*1700 |
41 |
0.071 |
0.0028 |
1700 |
68*5*5 |
4.31 |
0.1694 |
850 |
3.12 |
| UDATC 2UEW 155 0.08*105 |
40 |
0.080 |
0.00315 |
105 |
21*5 |
1.19 |
0.0469 |
850 |
36.32 |
| UDATC 2UEW 155 0.08*180 |
40 |
0.080 |
0.00315 |
180 |
36*5 |
1.65 |
0.0649 |
850 |
21.19 |
| UDHTC 2UEW 155 0.060*200 |
|
0.060 |
0.00236 |
200 |
40*5 |
1.35 |
0.0531 |
750 |
33.61 |
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Company Profile
HANGZHOU HONGTONG WIRES CO.,LTD was established in 2004. It is a company that has been focusing on the research, development and production of enameled wire for 21 years. The company has always adhered to the business tenet of "high quality and excellent service", committed itself to high-quality development, and created value for customers.
As a professional enameled wire manufacturer, we always regard product quality as our corporate lifeline. Strictly implementing ISO quality management system standards, we are equipped with advanced testing equipment and a professional quality inspection team to conduct precise examinations on each production batch, covering over 20 critical parameters including conductor resistance, film thickness, voltage resistance, and flexibility. From raw material procurement to production process control, from in-process inspections to full product testing, we have established six-tier quality control procedures to ensure every coil of enameled wire delivered to clients fully complies with IEC international standards and specific customer requirements. Maintaining a 99.98% factory pass rate for years, we demonstrate our relentless pursuit of excellence through verifiable data.
Workshop&Equipment
Currently, the company has two major production bases. HangZhou base is located in Cangqian, the western suburbs of Hangzhou,Zhejiang Province .The plant covers an area of 23,000 square meters .There are more than 260 sets of various wire drawing machines, Litz wire bunching machines, Litz wire Serving machines, Litz wire taping machines, extruded Litz wire production lines, flat taped Litz wire machines and other equipments. XuanCheng base is located in Xuancheng Economic Development Zone, Anhui Province. The plant covers an area of 30,000 square meters, 19 enameled wire production lines and 118 sets of various wire drawing equipments. The total annual production capacity of the two bases is more than 20,000 tones.
Our Advantages
1.The company was established in 2004 and has obtained one utility model patent and one invention patent.
2.The factory area has introduced advanced barcode technology to achieve precise identification and tracking of products. Relying on the Internet of Things, it enables zero-latency real-time monitoring of equipment.
3.The company has two production plants .
Hangzhou Factory covers an area of 23,000 square meters, with 20 enamel coating production lines and more than 200 various wire drawing machines.
Xuancheng Factory covers an area of 30,000 square meters, with 19 enamel coating production lines and more than 118 various wire drawing machines.
4.The company focuses on the research, development and production of enamelled wire. Enamelled wire include
Enamelled Round Wire
Litz Wire
Served Litz Wire
Taped Litz Wire
Extruded Litz Wire
Profiled Litz Wire
5.Diameter range Φ0.035mm-Φ1.000mm(AWG47-AWG23)
6.Can be customised with various insulating materials and different thermal values.
Insulation material:Polyurethane,Polyesterimide,Polyamideimide, Aromatic Polyamideimide,etc.
Thermal values:155,180,200,220 ,240
7.Quality management system and certification
IATF16949
ISO 9001
UL(Cert. No. E326617)
RoHS
Certifications
The company designs and produces on the basis of IEC standards and according to various special quality requirements put forward by customers. At the same time, production control and management in accordance with the requirements of IATF 16949 and ISO 9001 quality management system .Moreover, with the triple certifications of UL, ROHS environmental protection and REACH, it safeguards the quality of its products.
FAQ
Q1. How are the temperature resistance grades of enameled wires classified? And which scenarios are suitable for different grades?
A1. Common temperature resistance grades are as follows:
- 130°C (Class B): It is a general-purpose type, widely used in household appliances and small motors.
- 155°C (Class F): Applicable to industrial motors and transformers. It has better heat resistance compared to Class B.
- 180°C (Class H): Mainly used in high-temperature working environments such as high-temperature motors, transformers, etc.
- above 180°C (Class C): It is suitable for special electronic devices in extremely high - temperature and high - pressure environments, such as motors and transformers in the aerospace and nuclear industries.
Q2. What is the wire diameter range of the enameled wires?
A2. The conventional wire diameter range is from 0.035mm to 1.000mm. Non-standard customization is also supported.
Q3. Do the enameled wires meet the RoHS environmental protection standard?
A3. Yes, the products have passed the EU RoHS certification, and the certificate number is E326617.
Q4. How to select enameled wires for high-frequency transformers?
A4. The key indicators are as follows:
- Low skin effect: It is recommended to choose litz wires or multi-strand thin wires.
- Low dielectric loss: Enameled wires with polyurethane or polyesterimide paint can be selected.
- Self-adhesiveness: It helps to reduce the impregnation process.
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