Sio2 silicon dioxide 21 % al2o Aluminum oxide 5.30 % fe2o3 Ferric oxide 3.30 % cao Calcium oxide 65.60 % mgo Magnesium oxide 1.10 % so3 Sulphur trioxide 2.70 % loi Loss of ignition 0.90 % C3a tricalcium aluminates 8.05 % C3s tricalcium silicate 60.00 % C2s dicalcium silicate 15.00 % c4af Tricalcium alumino ferric 9.76 % Physical and mechanical properties Blain cm2/gr 3.250 Autoclave expansion 0.02 Initial setting time (vicat) 105 minutes Final setting time (vicat) 135 minutes Compressive strength 03 days - 230 kg/cm2 07 days 305 kg/cm2 28 days 420kg/cm2. On the customer requirements.