... 1,White u-pvc rigid drainage/u-pvc water-proof pipe 2,Material :U-PVC 3,ISO,IEC,GB Standard 5,Size:16mm-200mm Discription:PVC drainage ... .Low coefficient of friction fo PVC-U pipe results in efficient flow and less maintenanceE.PVC-U is a combustion-proof material ... .Low coefficient of linear expansion of , thermal expansion of pvc-u pipe is less than polyolefin by , low thermal conductivity ...