Grey portland cement for construction grade 42, 5 r/n according to brutish and european standards din en 197-1/2000 or astm c 150. CHEMICAL COMPOSITION CONTROL RANGE UNIT MIN. MAX. 1 SILICON DIOXIDE (SiO2) % 20, 80 23, 00 2 ALUMINUM OXIDE (AI203) % 4, 50 6, 00 3 FERRIC OXIDE (LIME) (Fe203) % 3, 10 6, 00 4 CALCIUM OXIDE (Cao) % 64, 00 68, 00 5 MAGNESIUM OXIDE (Mgo) % 1, 00 5, 00 6 SULPHUR TRIOXIDE (SO3) % 2, 70 3, 00 7 LOSS OF IGNITION (Loi) % 1, 00 3, 00 8 INSOLUBLE RESIDUE % 0, 10 0, 70 9 TRICALCIUM SILICATE (C3S) % 50, 00 64, 00 10 DICALCIUM SILICATE (C2S) % 14, 20 18, 00 11 TRICALCIUM ALUMINATE (C3A) % 6, 00 9, 50 12 TRICALCIUM ALUMINO FERRICE (C4Af) % 8, 00 12, 00 PHYSICAL AND MECHANICAL PROPERTIES 1 BLAIN CM2/GR 3, 25 2 AUTOCLAVE EXPANSION 0, 02 3 NORMAL CONSISTENCY % 27, 50 4 INITIAL SETTING TIME (Hours Mins) 3:25 4:50 5 FINAL SETTING TIME (HOURS Mins.) 4:54 6:00 6 FINITES INDEX (CM2/GM) 2800 3040 7 COMPRESSIVE STRENGTH ISO/EN 19/200