1.process :Butt-welded&Overlap 2.cold or hot water,gas series 3.ISO,CE,AENOR, EMI ... and plastic .1.process :Butt-welded&Overlap2.cold or hot water,gas series3.ISO,CE,AENOR, EMI certificate4.top ... Composite pipePERT-AL-PEX Composite pipeapplication1. Hot water and cold water pipe for production and domestic use;2. ... and so on;3. Pipe used for solar energy water heater;4. Coal gas and natural gas pipe;5 ...