... Chemical resistance, burst strength, less friction compared to metal pipes, PVC Pipes can be used with advantages for drainage, portble water ... --- 2014/07/10 Product Certification CQM CQM11P10214R0S Building dewatering pvc-u pipes,dn <= 315mm 2011/08/11 --- 2014/07/10 Testing ... Date Product Quality Inspection Report FQII Building dewatering pvc-u pipes,dn 110*3.2 2012/08/06 Product Quality Inspection ...