... : 0.4MPa, 0.6MPa, 0.8MPa, 1.0MPa, Plastic corrugated pipe for drainage Physical-mechanical characteristic: ItemsIndexTesting MethodRing stiffnessSN8≥8GB/T9647 ... 8.4.5 of CJ/T225-2006Tensile strength(N) of polyethylene connection interface≥1460GB/T8804Creep rate≤2GB/T8042Specifications are as below ... ):200mm, 225mm, 300mm, 400mm, 500mm, 600mm, 700mm ,800mm Plastic corrugated pipe