As of 2026, the electrical insulation materials industry is rapidly evolving toward high-performance capabilities, domestic substitution, and deep alignment with downstream application scenarios, with the overall market size maintaining a steady upward trajectory.
Market Size and Growth Trends
- Overall Market Expansion: my country's insulation materials market reached 81.12 billion RMB in 2025, with a compound annual growth rate (CAGR) of approximately 3.1% from 2018 to 2025. Notably, the market size for the electrical insulation paperboard segment surpassed 12 billion RMB in 2026, maintaining a CAGR of 8%–10% over the past five years.
- Sustained Demand Growth: Continued expansion in downstream sectors-such as UHV (Ultra-High Voltage) power transmission and transformation, new energy grid integration, urban distribution network upgrades, and energy-efficiency improvements for industrial motors-is driving steady growth in the demand for insulation materials.
Core Technology Development Trends
- High Performance with Low Dielectric Loss:High-end products, such as extra-wide, low-dielectric-loss epoxy paperboard, are becoming the mainstream standard. Premium products can maintain a dielectric loss factor (tan δ) below 0.5% at power frequency, with some advanced products achieving levels below 0.3%, thereby significantly reducing energy consumption and the risk of overheating in power equipment.
- Accelerated Domestic Substitution: Categories that long relied on imports-such as high-end silicone resins and silicone encapsulation materials-are overcoming synthesis process barriers through industry-academia-research collaboration. A 2026 industry symposium explicitly identified the synthesis and modification of high-end silicone resins as a key area for technological breakthroughs.
- Digital Process Upgrades: Insulation protection for new energy batteries is shifting from traditional PET film wrapping to digital UV-curing coating processes. High-performance UV insulating inks offer dielectric strength exceeding 6 kV and are compatible with complex battery cell structures, driving the evolution of manufacturing toward automation and integration.
