Steel-reinforced spiral-wound corrugated pipes have a three-layer reinforced structure. These three layers consist of an inner and outer layer of HDPE (High Density Polyethylene) and a U-shaped steel band. The inner layer of HDPE is formed by extrusion and winding.

Before the steel strip is formed into a profile, it is coated with a special polyethylene material. The steel is wound onto a mandrel as a profile, and the inner, middle, and outer layers are simultaneously bonded together to form a spiral corrugated pipe.

Steel provides exceptional durability and, because it is coated, becomes resistant to all types of corrosion. The HDPE inner and outer layers resist corrosion. The high strength and advantages of steel make this pipe unique.