Hollow composite insulators are mainly composed of glass fiber reinforced winding tube parts, silicone rubber climbing skirts and connecting flanges. 

Epoxy glass fiber reinforced winding tubes are the insulating inner components of hollow composite insulators. They are processed by winding with a special winding machine using epoxy resin pre-impregnated continuous alkali-free glass fibers in accordance with mechanical layering design, and possess excellent mechanical strength and dielectric properties. Silicone rubber creepage skirts serve as the outer insulation of hollow composite insulators, undertaking necessary electrical performance such as protection and providing creepage distance. The connecting flange is made of aluminum by die-casting and uses a unique bonding technology to transfer mechanical loads and provide sealing for the supporting and connecting structure. Hollow composite insulators are applicable in 40.5kV to 550kV power systems, such as SF6 transformers, SF6 circuit breaker sleeves, lightning arresters, high-voltage bushings, section capacitors, and cable terminals, among other high-voltage electrical products.