Color Homogenous brightness white Water 65 Fitness ( % ) 0.2 Setting time ( min ) 6 -8 min sec Soundness ( % ) No appear of decay bubbles or holes Transverse strength ( n/mm ) 3.3 So3 ( % ) 54 CaO ( % ) 37 MgO ( % ) 0.2 Calcium sulfate ( CaSO4 . 0.5H2O ) 92.5 Loss of ignition ( % ) 5.8