... laser welding pipe for hot water Specifications:1. Five layers: Polyethylene, Adhesive, Aluminium, Adhesive, Polyethylene2. Connection mode: Overlap welding; Butt welding3 ... ,3240,4150,50634. Series: PE-AL-PEX pipes; PEX-AL-PEX pipes ,PE-AL-PE pipes, PPR-AL-PPR pipesallow long-term working ... gas conveying;6) Used for oxygen input in hospital; XPAP composite pipe