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Major Technical Indicators of Ginde PVC-U Spiral Noise-Abating Pipeline System S0 S1 S2 Ring Stiffness KN/銕?鈮?.5 鈮?.5 鈮? Apparent Density G/m3 0.9-1.3 Composite Test No Breakage, No Desquamating Hammer Dropping Impact Test (0鈩? No Breakage, No Desquamating Vertical Shrinkage Rate 鈮?% No Breakage, No Desquamating Dichloromethane Immersion Test The inside and outside surface should not be less than 4LPVC-U Pipeline System For Water Drainage website:http://www.gindegroup.com/water-drainage-system/pvc-u-pipeline-system-for-water-drainage/