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Some Portland cement is produced by grinding clinker manufactured by burning raw materials like limestone, marl, clay, iron ore, pyrite ash, bauxite etc. at appropriate proportions by addition of a certain amount of retarder (generally gypsum) and sets and gains strength after a certain time being mixed with water.

Our Grey Ordinary Portland Cement conforms to British Standard Specification BS12/1996 or ASTM C-150.

SPECIFICATIONS AND CHEMICAL COMPOSITION OF PORTLAND CEMENT

*CHEMICAL* *ANALYSIS*	*UNIT*	*CONTROL* *RANGE*	*TYPICAL*
*SILICON DIOXIDE (SiO2)*	%	*20.8 – 23*	21
*ALUMINIUM AXIDE (Al2O3)*	%	*4.5 – 6.0*	*5.30*
*FERRIC OXIDE (Fe2O3)*	%	*3.1 – 6.0*	*3.30*
*CALCIUM OXIDE (Cao)*	%	*64 - 68*	*65.60*
*MAGNESIUM OXIDE (Mgo)*	%	*1.0 – 5.0*	*1.10*
*SULPHUR TRIOXIDE (SO3)*	%	*2.7 – 3.0*	*2.70*
*LOS OF IGNITION (Loi)*	%	*1.0 – 3.0*	*1.90*
*INSOLUBLE RESIDUE*	%	*0.1 – 0.7*	*0.4*
*TRICALCIUM SILICATE (C3S)*	%	*50.0 – 64.4*	60
*DICALCIUM SILICATE (C2S)*	%	*14.2 – 18.2*	15
*TRICALCIUM ALUMINATE ( C3A)*	%	*6.0 – 9.5*	*8.05*
*TRIC. ALUMINO FERRICE (C4Af)*	%	*10.5 – 12.0*	*9.76*
*CHROMIUS ES. (CR6) AT LEST FOR A 6 MONTHS PERIOD*			*<2ppm*

Physical And Mechanical Properties:

BLAIN CM2/GR		3.25
AUTOCLAVE EXPANSION		002
NORMAL CONSISTENCY	%	27.5
INITIAL SETTING TIME	Hours Mins	3:25 – 4:50
FINAL SETTING TIME	Hours Mins	4:54 – 6:00
FINTES INDEX	(CM2/GM)	2800 - 3040
COMPRENSIVE STRENGTH ISO/EN 19/200		BS 4550 MORTAR
@ 03 DAYS	KG/CM2	26.5 – 34.2
@ 07 DAYS	KG/CM2	37.3 – 42.5
@ 28 DAYS	KG/CM2	52.8 – 54.6

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