This product is suitable for electrified railway tunnels with complex operating conditions, which can effectively prevent pollution flashover accidents and reduce the workload of cleaning and maintenance. It is not only subjected to tension (long rod insulators PQE1~PQE4) during operation, but also to bending force (line insulators). Structural insulators (PQX1~PQX5), due to their small size, are irreplaceable products such as porcelain and glass insulators when the clear space of the tunnel is small, especially in heavily polluted areas. Composite insulator for railway has compact structure and strong integrity,it has good antifouling property,light weight and small volume.Also it has good insulation performance and mechanical strength.This product is mainly used in high speed railway and Urban Rail Transit.1.Insulator in the transportation and installation to should take put down gently, and should not be thrown, and to avoid all kinds of miscellaneous pieces of (wire, iron plate, tools, etc.) and sharp hard object collision and friction. 2. When the composite insulator is hoisted, the knot is tied on the end accessories, and it is strictly forbidden to hit the shed or sheath. The rope must touch the shed and the sheath, and the contact part should be wrapped with soft cloth. 3. Do not use the composite insulator as an auxiliary tool for placing (retracting) wires, so as not to damage the insulator due to impact force or bending moment. 4. It is strictly forbidden to step on the insulator umbrella skirt