Wavin’s multilayer composite pipe comprises an inner plastic layer made of cross-linked polyethylene (PEX-c), an outer plastic layer of high density polyethylene (HDPE), and a butt welded (for consistent wall thickness) aluminium layer, in between.

The aluminium layer is welded to the inner and outer plastic layers by the use of a coupling agent, producing a pipe structure with a total of five layers. This two-step manufacturing process gives greater control, resulting in a consistently high quality pipe.