Nanjing Electric Insulator Co., Ltd. specializes in the development of Glass Insulators, Composite Insulators and Porcelain Insulators,Etc. In 1958, R&D the first tempered glass insulator in China , filling a domestic gap. We own the CNAS certification for test lab. The company attaches great importance to independent innovation, and its annual R&D investment ranks among the forefront of the industry.