Tangshan Porcelain Insulator company Co., Ltd which is built in1952, the predecessor is âTangshan High Voltage Porcelain Factoryâ.In 2003 it succeeded the remanufacture is the limited liabilitycompany, the establishment âthe Tangshan city porcelain insulatorlimited companyâ. It is the biggest rod insulator enterprise inChina. As a professional porcelain insulator company, itconcentrates on the development, design, and manufacturing of126kV~1100kV rod insulator, ±500kVã±800kV DC rod insulator and126kV~550KV SF6 porcelain shell etc. High quality, wide range ofproducts and high working efficiency make it is one of the keyenterprises in China insulator industry. The product trade mark isâTDâ.Â