"Reunification plastic" card PVC-U double-wall corrugated pipe wall section is hollow trapezoidal continuous corrugated structure, with high compressive strength, wall smooth, water resistance, high pass water capacity, corrosion resistance, light weight, small joints ( long length), convenient and reliable connection, long life and other characteristics, is an ideal alternative materials cast iron pipes and cement concrete pipes. The company's products according to national standards GB / T 18477.1-2007 "buried drainage with a hard polyvinyl chloride (PVC-U) structure wall piping systems - Part 1 double wall corrugated pipe" production requirements. Product Features 1. The ring stiffness: hollow annular wall with a reasonable structure design, greatly improving the pipe ring stiffness, in the case of the same material, can withstand greater pressure on the environment. 2. Fluid resistance: smooth wall, the frictional resistance is significantly less than the concrete pipe. Practice has proved that, in the same grade, with smaller diameter double-wall corrugated pipe can achieve the same flow; at the same diameter, the use of double-wall corrugated pipe can reduce the slope, effectively reducing the amount of excavation works. 3. Connect tightness: elastic ring socket connection, connection tightness significantly better than metal pipes and concrete pipes. The excellent corrosion resistance: excellent corrosive acid salt, and other media, corrosion much better than metal pipes and concrete pipes. 5. The construction is simple: light weight, length (less joints), and the foundation trench for the requirements of low, easy to connect, construction speed, integrated low price. 6. Long life: pipe wear resistance, long service life. Outside the range of product applications 1. municipal, building underground sewerage and drainage pipe. 2. Agricultural drainage and irrigation pipes without pressure. 3. buried communication wires, optical fiber, low-voltage cable sheathing. Embedded pipes 4. railways, highways and other roads. 5. Mine ventilation and transmission fluid pipes.