1,Certificates:ISO9001,CE 2,Promduce in Astm Technological 3,5 days delivery 4,OEM accept Multilayer pert-al-pert pipe Multilayer pert-al-pert pipe : Type:Butt welding +Overlap pipes The multilayer pipes PERT/AL/PERT are composite pipes, that are produced in overlapping and butt welding methods.They are composed of an inner and outer layer of PERT, that are bonded by a special glue to the ...