... bonded with melt adhesive to the mid-layer of aluminum core which is longitudinally welded ... used in building water supply systems, heating pipe systems, air-conditioning systems, and domestic hot ... by detector when embedded owing to the metal layer in the middle, so that it is ... mainly supply PE pipe, PPR pipe, SRTP pipe, SRTP pipe, PE-RT pipe, HDPE pipe, UHMW PE pipe and supporting pipe fitting used ...