(July 30, 2026)The layout of new power infrastructure is accelerating, bringing market expansion opportunities for high-purity fumed silica dedicated to insulating silicone rubber for high-voltage cables. With the continuous launch of UHV power grids, offshore wind power, new energy vehicle high-voltage wiring harnesses and energy storage system supporting cable projects, downstream cable manufacturers keep raising standards on electrical stability, damp-heat aging resistance and leakage resistance of insulating materials. As the core reinforcing filler for silicone rubber insulating layers, high-purity modified fumed silica directly affects the long-term operation safety of cables. The power cable sector has become another vital emerging growth point for high-end silica.
For a long time, low-ion fumed silica matched with high-end high-voltage silicone rubber cables has long relied on overseas supplies. Ordinary industrial-grade silica contains relatively high soluble metal ions. After being filled into insulating silicone rubber, it tends to increase dielectric loss, causing hidden risks such as accelerated aging and declining insulating performance under long-term electrification, and fails to meet strict standards for high-voltage and vehicle-mounted wiring harnesses. Cable-specific silica with deep purification and precise hydrophobic modification effectively reduces surface polar groups and trace impurities, and disperses evenly in silicone rubber systems. It can significantly improve the tensile and tear strength of insulating rubber, restrain rubber structuring, and guarantee stable insulating properties. It is applicable to the manufacturing of new energy 800V high-voltage wiring harnesses, wind power cables, indoor and outdoor high-temperature-resistant power cables.
In the second half of 2026, multiple offshore wind power and power grid renovation projects start construction intensively. New energy vehicle manufacturers accelerate the localization of raw materials for high-voltage wiring harnesses. Continuous updates to cable industry specifications fully upgrade testing requirements for insulating raw materials in terms of purity, batch consistency and long-term aging resistance. Leading domestic silica enterprises speed up the construction of dust-free dedicated production lines for cables, optimize combustion synthesis and surface modification processes, and continuously develop graded products with low ions and low dielectric loss. Many powder enterprises carry out collaborative R&D with cable material research institutes, and customize filler solutions for high-voltage DC cables, vehicle-mounted wiring harnesses and photovoltaic inverter connecting wires.
Different cable categories impose differentiated indicator requirements on silica. Materials for new energy vehicle high-voltage wiring harnesses enforce strict control over soluble impurities for stable dielectric performance; insulating materials for offshore wind power cables focus on long-term resistance to salt spray and damp heat aging; general power installation cables balance processing fluidity and cost; communication high-frequency cables set strict requirements on powder particle size uniformity and low haze. A single universal grade can hardly adapt to diverse working conditions, pushing powder enterprises to build graded product portfolios. Leading downstream cable manufacturers implement lengthy raw material certification cycles, continuously lifting dual thresholds of technology and qualification for this track.
The track boasts broad development prospects, yet industrialization challenges cannot be ignored. Fumed silica for cable insulation requires extremely high standards for production environment cleanliness and full-process impurity control, demanding massive investment in production line renovation. Established overseas material suppliers have engaged in the power material sector for years with complete long-term operating test data. Numerous small and medium-sized powder manufacturers lack deep purification technologies with fluctuating ion indicators, making it difficult to enter high-end cable supply chains. Low-cost powder with unqualified indicators circulating in the market may trigger potential safety hazards during long-term cable operation and damage the industry’s reputation.
The differentiated supply-demand pattern of the industry becomes increasingly prominent. Leading enterprises equipped with stable high-purity production processes, complete electrical performance testing capacity and formula technical support achieve steady order growth. Manufacturers lacking refined purification and modification technologies that only produce general powder are limited to the low-end ordinary cable market. The localization process of the cable industry speeds up, and procurement orders keep converging to upstream raw material suppliers with stable quality control and complete certifications.
Industrial research institutes forecast that demand for cables supporting wind power, energy storage and new energy vehicles will be continuously released in the next three years, production capacity of high-voltage insulating silicone rubber will expand steadily, and the market scale of high-end fumed silica dedicated to cables will maintain an upward trend. Products in this track feature high added value and solid long-term demand certainty. It serves as a key direction for fumed silica enterprises to break cut-throat competition in traditional tracks and explore new energy power new material markets.
In the long run, developing high-purity fumed silica for cable insulating silicone rubber helps domestic silicon-based powder enterprises accelerate import substitution of high-end products. Domestic silica manufacturers shall continuously optimize the integrated process of high-temperature synthesis, deep purification and hydrophobic modification, strictly control trace ion impurities, and complete compliance testing and certification related to power materials. Strengthen joint upstream and downstream development with cable and silicone enterprises, iterate filler products suitable for new-generation high-voltage cables, and enhance the competitive position of domestic fumed silica in the global power insulating material industrial chain.