Product introduction: This pipe is mainly used for municipal rain and dirt separation, drainage pipeline renovation projects, sponge city construction, and more and more demand for drainage pipes and inspection wells. Compared with cement pipes and inspection wells, rigid polyvinyl chloride (PVC-U) double-layer axial hollow wall pipes and polyvinyl chloride (PVC) inspection wells have obvious advantages of good sealing, corrosion resistance, convenient transportation, fast construction, and saving construction period. It is being used more and more in drainage projects in China. Technical indicators Item index density/ (kg/m3) ≤1550 longitudinal shrinkage rate/ (%) ≤5 ring stiffness/ (kN/㎡) SN4≥4SN6.3≥6.3SN8≥8SN10≥10SN12.5≥12.5SN16≥16 Oven test no stratification, no split impact performance (TIR) /%≤10 Dichloromethane impregnation test surface no change hydrostatic test 20 ℃, 0.4MPa, 1h, no penetration, no rupture System adaptability No penetration Only hydrostatic test is carried out when the pipe is used for pressure water delivery. Scope of application: suitable for municipal rainwater, sewage projects, water conservancy projects, pipe substitution canals and other projects. It is also suitable for construction community drainage, power pipes, etc. When selecting pipes with appropriate ring stiffness registration should be selected according to soil quality, depth of burial and bearing capacity.