Silicone Resin

As modern industrial electrical systems rapidly evolve toward high voltage, large capacity and intensive layout, high-temperature resistant insulating materials serve as the invisible framework guaranteeing stable operation of power equipment. Their performance limits directly set the safety ceiling of related devices. Driven by renewable energy grid integration, ultra-high voltage power transmission and intelligent rail transit, conventional insulating materials suffer increasingly severe performance degradation under long-term thermal stress, complex electromagnetic fields and high-humidity conditions.

Targeting this widespread industry bottleneck, Chinese enterprises have focused on developing high-temperature resistant advanced materials. Drawing on nearly two decades of technological accumulation, they have commercialized silicone laminated fiberglass boards. Boasting exceptional thermal stability and dielectric reliability, these products secure a leading position for domestic manufacturing within high-end insulating substrate sectors, fully embodying rigorous standards and solid industrial responsibility of China’s advanced manufacturers.

Silicone Laminated Fiberglass Board: A Breakthrough Material for Class H Ultra-High-Temperature Service

Developed to meet stringent Class H operating conditions (180°C), silicone laminated fiberglass boards are primarily composed of alkali-free fiberglass cloth impregnated with silicone resin. Benefiting from the high bond energy of Si–O bonds, the boards retain over 90% of their mechanical and dielectric strength under continuous service at 180°C or intermittent high-temperature overload, outperforming ordinary epoxy phenolic boards by a substantial margin.

Additionally, the material features self-extinguishing flame retardancy meeting UL 94 V-0 rating and outstanding arc resistance, with a dissipation factor remaining ≤ 0.03 at 180°C. It maintains consistent electrical performance when applied to arc barriers for vacuum circuit breakers, support strips for dry-type transformers, and insulating components used in high-altitude plateau regions. Its surface hydrophobicity effectively resists intense ultraviolet radiation and ozone degradation, ensuring long-term operational safety.

Amid the global trend of domestic import substitution, Chinese manufacturers avoid low-price homogeneous competition. Reliable batch-to-batch consistency and verified long service life win worldwide market recognition. The products are widely supplied across all provinces and municipalities of China and exported to Southeast Asia, Europe and other overseas regions, enabling Chinese-made insulating substrates to gain decisive bargaining power within global industrial supply chains.