Until March 2019, the cumulative sales and supply of Nanjing Electric Group's LD brand AC and DC toughened glass insulator products exceeded 100 million pieces, accounting for one-half of the country and one-sixth of the world.

Since its inception in China in 1958, the product has experienced three development stages: manual production, mechanized production, and automated production with imported technology. It has gradually developed into the company’s leading product, core product and main export product, serving power construction and replacing product imports. It is better To meet the needs of the development of the national power industry, especially the construction of key national projects. For more than 60 years, the company has insisted on independent innovation and independent brands, gradually mastering the world's leading core technology and owning independent intellectual property rights. The products cover the domestic market and are exported to more than 70 countries and regions in the world. Especially since 2011, the products have been widely used in national UHV projects. Until 2019, a total of 22 UHV lines have been adopted for "West-to-East Power Transmission", "Anhui-East Power Transmission", "Xinjiang Power Transmission", "Shaanxi Power Transmission", "Mongolia Power Transmission", and "Power Transmission to Xinjiang" and “Nortel’s Southern Power Supply” and other national key projects, as well as the “Belt and Road” construction and global power development. Since 2015, LD brand glass insulator products have been gradually transferred to Nanjing Electric Insulator Co., Ltd., which is located in Nanjing Economic and Technological Development Zone, for R&D, production and sales.