In power transmission, industrial manufacturing, new-energy vehicles, rail transit, and aerospace, wires and cables serve as the “neural pathways” for energy and signal transmission. Conventional PVC and rubber-based cable materials are highly susceptible to softening and deformation, insulation failure, aging-induced cracking, and even fire hazards under harsh operating conditions such as high temperatures, open flames, prolonged outdoor exposure to sunlight, and extreme temperature fluctuations. In contrast, silicone materials, owing to their unique molecular structure and outstanding comprehensive performance, have become the core raw material for the insulation, jacket, and filling layers of high-end wires and cables. They provide critical support for achieving the three key performance attributes of high-temperature resistance, flame retardancy, and aging resistance, and represent an indispensable functional new material for specialty cables.

The reason silicone can meet the demanding service conditions of wires and cables lies in its unique molecular backbone structure. Conventional polymers typically feature carbon–carbon bonds as the main chain, which have relatively low bond energy and are prone to thermal cleavage and decomposition; in contrast, the silicone backbone is composed of silicon–oxygen bonds, whose bond energy is significantly higher than that of carbon–carbon bonds. The molecular chain adopts a stable helical conformation, with organic groups attached as side chains, thereby combining the thermal stability of inorganic materials with the flexibility and elasticity of organic polymers. This fundamental structural design confers inherent advantages in high-temperature resistance, weatherability, and electrical insulation.

High-temperature resistance: Stable performance and no failure across extreme temperature ranges.

High-temperature resistance is the most distinctive hallmark of silicone cables. Conventional PVC cables can typically withstand temperatures only up to 60–80°C; beyond this range, their insulation layers rapidly soften, melt, and fail. In contrast, silicone cables deliver stable performance across an exceptionally wide temperature range—from –60°C to 250°C. Standard grades can operate continuously at 150–200°C, while specially formulated, modified silicone compounds can endure brief exposure to temperatures exceeding 250°C. In high-temperature applications such as metallurgical furnaces, industrial ovens, engine compartments, and new-energy charging stations, the silicone insulation remains resistant to molecular-chain scission and hardening-induced embrittlement even under sustained thermal stress, maintaining excellent elasticity and insulation resistance. Conversely, in extremely cold outdoor environments or low-temperature cold-storage settings, silicone cables do not become brittle and crack like conventional plastic cables; instead, they retain flexibility and integrity, making them ideally suited for harsh operating conditions characterized by alternating high and low temperatures.

Flame-retardant safety: self-protects upon exposure to fire and prevents fire from spreading.

Electrical safety is the fundamental bottom line for wires and cables, and silicone materials provide a reliable fire-resistant barrier. Conventional cables, when ignited, drip molten material and emit toxic fumes, which can easily ignite surrounding objects and rapidly expand the fire; in contrast, silicone is a halogen-free, environmentally friendly flame-retardant material that produces no corrosive toxic gases during combustion and generates extremely low smoke. More critically, ceramic-forming silicone undergoes a rapid phase transition when exposed to open flames and high temperatures, forming a hard, dense ceramic protective layer on the cable surface that tightly encapsulates the internal conductors, effectively blocking oxygen and heat. This not only prevents further combustion of the insulation but also maintains short-term electrical conductivity, buying precious time for evacuation and emergency repairs. Moreover, after combustion, silicone leaves behind only stable inorganic silicate residues, with no molten dripping—thereby eliminating at the source the risk of fire spread—and making it widely suitable for high-fire-safety applications such as high-rise buildings, underground utility tunnels, and rail transit systems.

Age and weather resistance: long-term service life, reducing operation and maintenance costs.

Electrical wires and cables are often exposed for extended periods to outdoor, underground, and chemically corrosive environments, enduring continuous UV radiation, ozone attack, rain and moisture, and corrosion from acidic or alkaline media. With conventional materials, such exposure can lead within just a few years to aging and chalking, insulation breakdown and leakage, and sheath cracking—resulting in extremely high replacement and maintenance costs. In contrast, silicone’s highly inert molecular structure confers outstanding resistance to UV radiation, ozone, climatic aging, and chemical corrosion, enabling it to withstand the relentless assault of sun, rain, wind, frost, snow, and other environmental factors over long periods. It also resists corrosion from oil contaminants, weak acids and bases, and industrial exhaust gases. Even after prolonged service, silicone cables exhibit no signs of hardening, shrinkage, cracking, or electrical leakage, with a service life more than three times that of conventional rubber- or plastic-based cables. In applications such as overhead power transmission, outdoor photovoltaic power plants, and chemical industrial parks, silicone cables can operate for extended periods with virtually no maintenance, significantly reducing line replacement and repair costs.

In addition to its three core performance attributes, silicone wire and cable also boasts a soft texture, a small bending radius, and easy installation, making it ideal for routing in the confined spaces within equipment. Moreover, it offers outstanding electrical insulation performance, with high dielectric strength and low leakage losses, ensuring stable and interference-free transmission of power and signals, and meeting the requirements of various cable applications, including high-voltage, low-voltage, and signal-control systems.

Today, driven by the rapid development of new energy, high-end equipment, and smart cities, market demands for wire and cable performance are continuously escalating in terms of temperature resistance, fire safety, service life, and environmental sustainability. Silicones are no longer niche specialty materials; they have become a core, indispensable raw material for the transformation and upgrading of the wire and cable industry. With their three key advantages—high-temperature resistance, flame retardancy, and aging resistance—silicones safeguard the security of power transmission, support the high-end, safe, and long-lasting development of various industries, and serve as an invisible yet reliable critical material underpinning modern industrial operations and everyday electricity use.