1.ISO2531 &EN545 certificated by SGS 2.DN80--1200 T-type 6 meter 3.zinc spraying, bitumen coating,cement lining ,epoxy 1) Standard: ISO2531, BSEN5452) Effective length:DN80-DN1200 6M by bulk shipment,5.7M by20'or40’container;3) Inner cement: Ordinary portland cement according to ISO4179, sulphate resistant cement4) Outside coating: Zinc coating(≥130/m2) and bitumen paiting or epoxy paiting(≥70μm) ...