... called random copolymerized polypropylene pipe,is a new generation of envirnonment-friendly construction material developed in the 1990s.Besides plastic ... reaching more than 160mms in caliber.Mingda PP-R pipes and pipe fittings are widely used in such areas as delivery ... fluids,heating pipes,circulation sysytem of hot water,pipes in agriculture,planting in gardens, parks and ranches,etc. PPR pipe