Ductile iron pipe s Competitive prices Prime quality Best service Quice deliver time Ductile iron pipe, DN80-DN800,K7-K12, GB13295,ISO2531,EN545,EN598 ... ) Inner cement: Ordinary portland cement, sulphate resistant cement, high-alumina cement;5) Outside coating: Zinc coating(130g/m2 ... inspection report or other third inspection party;9) Class: K7, K8, K9, K10, K12, class 30, class 40 Ductile iron pipe