لوله هاي چند لايه مورد ارائه در اينجا شامل 5 لايه ميباشد كه لايه هاي دروني و بيروني آن از پلي اتيلن  فشرده با ( اچ دي پي
اي يا پكس) درست شده است
PE(X)-AL-PE(X)(PAP) multilayer pipe is a five-layer composite pipe, its inside and outside layers are made of
Hi-Density,Cross-Linking or Medium Density Polyethylene (HDPE or PEX), tightly bonded with heating adhesive to the
mid-layer of longitudinally overlapped-welded aluminum core of the pipe. All layers are extruded by one step. Available
in white.
PE(X)-AL-PE(X) multilayer pipe's inside and outside layers are of special PE, Hygienic, toxic-free and smooth. Its
middle layer of AL is 100% of gas/oxygen tightness, which gives it both advantages of metal and plastic pipe, but
eliminates their own disadvantages.
http://brass-tube.com/pe.htm