... , polypropylene copolymerization by extrusion become pipe, PP injection become fittingsAdvantages:Pp-r with a general plastic pipe light weight, ... Pp-r raw material molecular only of carbon, hydrogen elements, no harmful elements of the toxic existence, not only for piping ... hot, can also be used in pure drinking water system.2, heat preservation and heat insulation. 3, good heat resistance. Pp-r ...