... 3. AENOR, WATERMARK, EMI, CE, ISO. Starwin composite pipe : Starwin composite pipe is composite pipe of five layers, inside and outside layers of ... -Density polyethylene (HDPE), Cross-Linked (PEX) or Polyethylene Raised Temperature (PE-RT), tightly bonded with melt adhesive to the mid-layer ... strive to promote benefit with our partners and collaborators . PEX-AL-PEX PIPE for hot water