Technical cultivator in the field of high-temperature cables

1、 Company Profile: Focusing on high-temperature wire, craftsmanship and intelligent manufacturing of quality

Jiangsu Xingyuan High Temperature Cable Co., Ltd. is located in the core area of the manufacturing industry in the Yangtze River Delta region. It is a technology-based enterprise that integrates research and development, production, and sales of high-temperature insulated cables. For many years, Xingyuan High Temperature Cable has always focused on the sub track of fluoropolymer insulated wire and special heat-resistant wire, and has built a complete industrial chain from material selection, extrusion process to finished product testing around core material systems such as PTFE, PFA, FEP, and silicone rubber.

Unlike traditional cable companies, Xingyuan has chosen a "narrow and deep" product route since its establishment - not pursuing a wide range of cable categories, but investing all resources in the technology direction of "high temperature resistance, corrosion resistance, and high reliability". At present, the company has formed four main product lines: PTFE PTFE high-temperature wire, PFA soluble polytetrafluoroethylene wire, FEP perfluoroethylene propylene wire, and silicone rubber high-temperature wire, and is equipped with a fire-resistant mica tape wrapping series, which can cover a wide temperature range from -60 ℃ to 1200 ℃.

In terms of customer structure, Xingyuan has long served leading enterprises in the fields of automobile manufacturing, aerospace, metallurgy and chemical engineering, home appliance heating elements, and industrial sensors. The company is equipped with a professional technical selection team, providing customers with full process supporting services from early sample trial production to batch delivery, and then to after-sales technical tracking.

2、 Material cornerstone: Why fluoropolymers can withstand extreme working conditions

Fluororesin has always been known as the "last choice in extreme environments" within the plastic material family. Compared with ordinary polyolefin plastics, the hydrogen atoms on the molecular chain of fluoropolymers are partially or completely replaced by fluorine atoms, and the bond energy of carbon fluorine bonds is as high as 485 kJ/mol, much higher than the 413 kJ/mol of carbon hydrogen bonds. It is precisely this extremely strong chemical bond energy that endows fluororesin with excellent thermal stability, chemical inertness, and electrical insulation properties.

Among all fluoropolymers, polytetrafluoroethylene (PTFE) is known as the "plastic king" and represents the most comprehensive performance. In its molecular structure, every hydrogen atom on the polyethylene main chain is replaced by a fluorine atom, forming a dense "fluorine atom barrier". This structure enables PTFE to work continuously for a long time at 260 ℃, exhibiting inertness to the vast majority of acids, bases, oxidants, and organic solvents, while possessing extremely low dielectric constant and excellent radiation resistance.

Figure 1 PTFE PTFE High Temperature Wire

However, there are also performance differences between different fluoropolymers. Although PTFE has top-notch performance, its melt viscosity is extremely high and cannot be directly extruded like ordinary plastics. Therefore, a process route of pushing and sintering must be adopted. In order to solve processing difficulties, the industry has developed two categories of PFA and FEP that can be melt processed:

PFA (Fusible Polytetrafluoroethylene)

PFA retains over 90% of the chemical stability and heat resistance of PTFE, while possessing the melt processing characteristics of thermoplastic plastics. Its long-term use temperature is about 250 ℃, and it can produce thin-walled insulation layers through conventional extrusion processes. It is particularly suitable for occasions that require high uniformity and dimensional accuracy of the insulation layer, such as high-frequency coaxial cables, chemical liquid transport pipe inner walls, etc.

FEP (perfluoroethylene propylene)

FEP is a copolymer of tetrafluoroethylene and hexafluoropropylene, with a long-term usage temperature of approximately 200 ℃. Its transparency and melt flowability are superior to PFA, and its price is relatively lower. It is widely used in high-frequency communication harnesses, internal wiring of household appliances, and scenarios that require corrosion resistance but not extreme temperatures.

Figure 2 PFA High Temperature Line

Silicone rubber insulated wire

In addition to fluoropolymer systems, silicone rubber high-temperature wires are another important category of products. The main chain of silicone rubber molecules is composed of silicon oxygen bonds, with high bond energy and good molecular chain flexibility. The long-term use temperature is usually between 180 ℃ and 200 ℃, and it can withstand 250 ℃ in the short term. Its outstanding features are softness, bending resistance, excellent cold resistance (up to -60 ℃), and significantly lower cost than fluoropolymer wire. It is widely used in heating elements, lighting fixtures, motor leads and other fields.

Figure 3 High temperature line of silicone rubber

3、 Detailed explanation of Xingyuan's core product line

3.1 PTFE PTFE High Temperature Wire: The "Victorious Army" for Long term Operation at 260 ℃

PTFE high-temperature wire is Xingyuan's flagship product. This series of wires uses pure copper or nickel plated copper conductors, with a suspended PTFE resin insulation layer on the outer layer, which is pressed and sintered at high temperature. Its continuous working temperature can reach 260 ℃, short-term temperature resistance can reach over 300 ℃, and the brittleness temperature is as low as -190 ℃, truly achieving "hot and cold compatibility".

In terms of electrical performance, the non-polar molecular structure of PTFE stabilizes its dielectric constant at around 2.1, with a dielectric loss tangent value below 2 × 10 ⁻⁴, and it hardly changes with temperature and humidity over a wide frequency range. This characteristic makes PTFE wire the preferred insulation material for internal wiring in high-frequency communication, radar systems, and precision instruments.

Chemical resistance is another major advantage of PTFE wire. Except for a few strong oxidants such as molten alkali metals, elemental fluorine, and chlorine trifluoride, PTFE is inert to almost all chemical media and does not dissolve or swell even in high-temperature, strong acid, and strong alkali environments. This characteristic makes it indispensable in chemical pipelines, semiconductor manufacturing equipment, and electroplating production lines.

图4  FEP氟塑料高温线

3.2 PFA高温线：薄壁精密布线的新选择

PFA线在兴缘产品线中定位“高精度、薄壁化”市场。与PTFE的推压工艺不同，PFA可通过常规熔融挤出实现薄壁绝缘层，最薄绝缘厚度可控制在0.1mm以内。对于空间受限的高密度线束、微型电机绕组和医疗设备内部连线，PFA线既能提供与PTFE接近的耐温耐腐性能，又能显著节省布线空间。

兴缘PFA线导体可选镀银铜、镀镍铜或纯镍，最高工作温度覆盖200℃~260℃区间，广泛应用于半导体测试设备、高温热电偶补偿导线以及航空仪表内部线路。

3.3 FEP高温线：性价比之选

FEP线定位“温度要求200℃以下、但对耐腐蚀性和绝缘可靠性有要求”的市场。其电气性能与PTFE接近，耐化学性同样优异，但价格比PFA低约15%~20%。在家电内部高温布线（如烤箱内部线路、咖啡机加热模块）、照明灯具灯头引线以及汽车传感器线束中，FEP线是高性价比方案。

3.4 硅橡胶高温线：柔软耐弯的全能选手

硅橡胶线以其极高的柔软度和耐寒性在兴缘产品矩阵中占据独特位置。该系列导体采用多股细铜丝绞合，绝缘层为高温硫化硅橡胶，外观柔软可反复弯折，长期使用温度180℃~200℃。在烤箱、微波炉、电暖器等小家电的加热元件引线中，硅胶线几乎是标配。

3.5 耐火线：火焰下仍能保持供电的安全屏障

耐火线是兴缘面向消防安全领域推出的特种产品线。其核心结构为：导体外绕包氟金云母带或合成云母带，外层根据需要编织玻璃纤维并涂覆耐高温涂层。云母带本身是一种无机矿物材料，熔点超过1200℃，在火焰直接灼烧时不会熔融、不燃烧，能在规定时间内维持绝缘完整性，确保消防报警、应急照明、电梯应急电源等关键回路在火灾中继续工作。

Figure 5 Core material of fire-resistant wire - Fluorine mica tape roll

Xingyuan fire-resistant wire is divided into bare copper wire type, nickel plated copper wire type, and pure nickel wire type according to the conductor material, and is divided into two levels of single-layer fire-resistant and double-layer fire-resistant according to the structure. The conventional temperature resistance levels cover 350 ℃, 450 ℃, 500 ℃, 800 ℃, 1000 ℃, and up to 1200 ℃, which can meet the fire-resistant wiring requirements of different severity levels from ordinary commercial buildings to metallurgical heating furnaces, petrochemical plants, and so on.

4、 Application areas: from tens of thousands of meters high altitude to kilometers deep wells

The application scenarios of Xingyuan high-temperature cables span multiple industrial fields, and their product reliability has been verified in long-term practical operation:

Aerospace and Defense

Inside aircraft such as airplanes, rockets, missiles, etc., high-temperature wires are responsible for key tasks such as signal transmission around engines and power supply for instrument systems. The Xingyuan PTFE/PFA line has been integrated into the internal wiring systems of multiple military and civilian aircraft, withstanding the tests of high-altitude low pressure, severe temperature differences, and strong vibrations.

Figure 6 High and Low Temperature Resistant Wire Harness Assembly for Aircraft Engine Systems

automotive industry

With the increasing demand for lightweight and high temperature resistance in new energy vehicles, the temperature of internal components in the engine compartment continues to rise, and traditional PVC wires are no longer able to meet it. Xingyuan FEP/PTFE wire is widely used in automotive sensor wires, ignition system leads, and wiring in high-temperature areas inside battery packs.

Metallurgy and Chemical Industry

The wiring around metallurgical heating furnaces and chemical reaction vessels is exposed to high-temperature and corrosive environments for a long time, and the lifespan of ordinary cables is extremely short. Xingyuan fire-resistant wire and PTFE wire can achieve maintenance free operation for several years under these working conditions, significantly reducing downtime and replacement costs.

Home appliances and consumer electronics

Silicone and FEP wires are standard configurations for heating modules in household appliances such as ovens, microwaves, coffee makers, and hair dryers. Xingyuan provides customized wire solutions for multiple leading home appliance brands, with wire diameter, color, and insulation layer thickness adjustable according to demand.

Industrial Heating and Sensing

In industrial heating furnaces, injection molding machines, 3D printers, and temperature sensors, high-temperature wires are directly wound or tightly attached to heating elements, which requires extremely high long-term thermal aging performance of the insulation layer. Xingyuan PTFE wire can work continuously for more than ten years at 250 ℃ without cracking or brittleness.

5、 Xingyuan Advantage: Triple Guarantee of Technology, Quality, and Service

Accurate material selection

In the face of different temperature, corrosion, and bending requirements, the Xingyuan technical team will recommend the optimal solution from the four major systems of PTFE, PFA, FEP, and silicone based on the actual working conditions of customers, to avoid cost waste caused by "overusing" and to avoid safety hazards caused by low selection.

Strict process control

The company has a complete production line from conductor twisting, insulation extrusion (or compression sintering) to finished product testing. Each batch of products undergoes withstand voltage testing, insulation resistance testing, high and low temperature cycling testing, and appearance inspection to ensure stable and consistent performance of the products before leaving the factory.

Strong customization ability

In addition to conventional specifications, Xingyuan can customize special wire diameters, special colors, special conductor structures (such as multi stranded wire, nickel plated copper, pure nickel, etc.) and special sheath combinations according to customer drawings, supporting the full stage demand from small batch samples to large batch stable supply.

Full process service response

From initial selection consultation and sample making, to technical tracking and problem feedback after bulk delivery, Xingyuan has established a complete customer service system. Technical engineers can directly interface with customer R&D and procurement departments to quickly respond to engineering changes and urgent order requirements.

6、 Conclusion

High temperature wire may seem small, but it is an indispensable "nerve endings" in industrial systems. The insulation failure of one wire may cause the entire equipment to shut down and even lead to safety accidents. Jiangsu Xingyuan High Temperature Cable Co., Ltd. always believes that in the field of high-temperature cables, mastering the performance of each material, refining every process, and stabilizing the quality of every batch are the greatest value to customers.

In the future, Xingyuan will continue to deepen its technological accumulation around the two major material systems of fluoropolymer and silicone rubber, expand its product line with a wider temperature range and higher reliability, and work with customers from various industries to provide more reliable wire solutions for high-temperature wiring in high-end manufacturing in China.