SYSTEMPEX. PEX-b-ALU-PEX-b pipes on a roll with blue HDPE jacket light version, for sanitary and heating. The pipe consists of a PEX-b inner pipe (silane cross-linked). An aluminium layer is bonded to this pipe by laser welding (butt welding). A protective layer of PEX-b is extruded onto this aluminium layer. As the diameter of the pipe increases, the thicknesses of the respective layers also increase. The thickness of the aluminium varies between 0,2 and 1,2 mm. The bonding between PEX-b and aluminium and between the outer layer of PEX-b is done with a copolymer adhesive. The jacket is an HDPE jacket light version: Improved flexibility and ease of installation, and a resistance of 240N (Newton).