Established in 1974, Longkou Appliance Insulating Materials Factory is one multiple managing factory that produces many kinds of insulating materials.

Through development in these years, it had now 54 million meters of 2715 PVC insulating lacquer sleeve, 20 million meters of alkali-free glass fibre belt with its advanced production equipments and complete measurement meas.

Trade mark of the products is "Longyue" Brand. The products were sold abroad in 1986 first time, and they are welcome deeply by the customers both at home and abroad.