... light weight, corrosion resistance, scaling and long service life Pp-r pipePp-r pipe and tube type, using polypropylene is ... extrusion of polypropylene copolymerization, injection pipe fittings become.Pp-r pipe what features?Pp-r pipe in general plastic light weight, ... centralized heat-supply system,2 the heating system, building, including floor, wall panels and radiant heating system,Three, can be ...