& nbsp; insulating materialThere are many kinds, including gas, liquid and solid. Common gasesInsulating materialsThere are air, nitrogen, sulfur hexafluoride & nbsp, insulating PC film and so on. The main types of liquid insulating materials are mineral insulating oil, synthetic insulating oil (silicone oil, dodecylbenzene, polyisobutylene, isopropyl biphenyl, diarylethane, etc.).

Solid insulating materials can be divided into organic and inorganic. Organic solid insulating materials include insulating paint, insulating glue, insulating paper, insulating fibre products, plastics, rubber, lacquer pipe and insulating impregnated fibre products, electrical thin films, composite products and tapes, and laminated products for electrical purposes. Inorganic solid insulation materials mainly include mica, glass, ceramics and their products. In contrast, solid insulating materials are of great variety and importance.

Different electrical equipments have different requirements on the performance of insulation materials. Insulation materials for high-voltage electrical devices such as high-voltage motors and high-voltage cables require high breakdown strength and low dielectric loss. The main requirements of low voltage electrical appliances are mechanical strength, elongation at break and heat resistance grade.