CaO 54.0%(Min) MgO 1.0% (Max) SiO2 0.5 %(Max) Al2O3 0.25%(Max) Fe2O3 0.20% (Max) Alkali 0.20% (Max) Decrepitation Index 3.5% (Max) Physical Size 40-80 Undersize 6% (Max) Oversize 5% (Max)