... 4)Strength,Durability,Safe,Long life 1.Ductile cast iron fittings produced according to ISO2531, EN545, BS4772, EN598, AWWA ... Outside painting zinc and then plus bitumen / FBE coating.5. Fittings: All flanged tee, all socket tee, flanged bend, socket ... 700≥10 Pa≥10SMechanical properties: NameTensile StrengthElongationYield StrengthHardnessDuctile iron fittings≥420MPa≥5%≥300MPa≤250HB Ductile cast iron ...