Jiangsu Shemar Electric Co., Ltd. is engaged in the research, development, production, and sale of composite external insulation for power system substations and transmission and distribution lines, as well as rubber seals, in China. Its product range includes line post, braced line post, and composite insulators for transmission lines; substation post insulators, compact composite substation gantries, explosion-proof transformer composite bushings, anti-flashover solutions, and sealing solutions for substations; and distribution line post insulators. The company also produces and sells rubber products, power equipment, and molds, and provides related technical development, support, services, and consulting. Founded in 1996 and based in Nantong, China, it operates as a subsidiary of Shanghai Shenma Electric Power Holdings Co., Ltd.