... )ISO2531,EN545,BS4772 4)Strength,Durability,Safe,Long life 1.Ductile cast iron fittings produced according to ISO2531, EN545, BS4772, EN598, AWWA C110 ... Pa≥15S≥700≥10 Pa≥10SMechanical properties: NameTensile StrengthElongationYield StrengthHardnessDuctile iron fittings≥420MPa≥5%≥300MPa≤250HB Ductile cast iron fittings