SMC composite material is a type of sheet-like molding material, mainly composed of GF (special yarn), MD (filler) and various additives. It first appeared in Europe in the early 1960s, and around 1965, the United States and Japan successively developed this craft. In the late 1980s, China introduced advanced SMC production lines and processes from abroad.

In terms of power insulation, SMC composite materials are widely used as insulation materials in power transmission systems. For example, it is used to support and fix electrical equipment, such as high-voltage transformers, insulation poles, grounding grids, etc. Due to its high strength and good insulation performance, SMC composite materials can ensure the stable operation of power systems.