Industry background and market demand
With the upgrading of industrial technology and the expansion of new energy industry, high-temperature cables have become a core component in the field of power transmission. The selection of its insulation material is directly related to the reliability, safety and service life of the cable in extreme environments. According to industry data, China's high-temperature cable market size in 2025 has exceeded 150 billion yuan, of which the demand in the new energy field is increasing by more than 25% annually. This growth trend has put forward higher requirements for the insulation material's temperature resistance, insulation performance and environmental protection.
Core selection principle
Temperature resistance
High temperature cables need to adapt to a wide temperature range of -60 ℃ to 260 ℃. For example, the fluoroplastic insulation layer of IRONFLON Wire&Cable can operate stably for a long time at 260 ℃, while modified silicone rubber is suitable for fluctuating environments from -50 ℃ to 200 ℃, meeting the needs of different industrial scenarios.
Insulation performance
In high-temperature environments, the dielectric loss coefficient of insulation materials should be lower than 0.002, and the insulation resistance should be above 1000M Ω to ensure power transmission efficiency and resist electromagnetic interference and aging problems.
Safety and environmental requirements
The material must pass the GB/T 19666-2025 flame retardant certification, maintain the circuit unobstructed in a 950 ℃ flame for 90 minutes, and control the smoke density to be ≤ 75 and toxicity index to be<60. In addition, halogen-free and low smoke polypropylene materials have become the preferred choice for environmental protection due to a 39% reduction in carbon emissions.
Chemical Resistance
Fluorine plastic (XLPE \ ETFE \ FEP \ PFA \ PTFE) and other materials can effectively resist acid, alkali, and salt spray erosion, and can effectively extend the service life of cables in harsh environments such as chemical plants or oceans.
Technological breakthroughs and future prospects
At present, polypropylene (PP), fluorine plastic (XLPE\ETFE\FEP\PFA\PTFE) and other new materials are gradually replacing the traditional cross-linked polyethylene. IRONFLON high-temperature cables have successfully completed the technological breakthroughs, which have significantly improved the stability of high-frequency signal transmission, and solved the aging problem in high-temperature scenarios, such as steel mills and photovoltaic power plants. In the future, as the engineering application of polypropylene cables in 110kV voltage level is gradually landed, the innovation of insulation materials will continue to promote the industry to develop in the direction of high efficiency, safety and sustainability.
Typical Case
Photovoltaic power station: the cable with ETFE double-layer co-extruded insulation structure, in a 500MW photovoltaic project in Inner Mongolia to achieve 25 years of UV aging life, its dielectric strength of 25kV/mm, to meet the -40 ℃ to 120 ℃ of the wide temperature range of the work requirements.
New Energy Vehicle High Voltage System: Ningde Times 800V platform adopts aerogel-modified silicone rubber insulated cables, with temperature resistance upgraded to 220℃, certified by IATF16949, and the weight of the wiring harness is reduced by 15% while maintaining the 800V voltage resistance performance.
Scandinavian wind power project: Danish wind farm uses environmentally stress-cracking-resistant insulating material, which has no cracking phenomenon after 1000 hours of testing and is adapted to the extremely cold climate.
European rail transportation system: a city subway uses 105℃ temperature-resistant grade cables, through 168 hours of thermal aging test performance change rate <10%, to ensure the long-term reliability of the power supply system.
