The composition of cements Type 2 (which is also known as Modified Portland cement) is in a way that compared to Portland cement type 1, has lower temperature when mixed with water (which usually reduces the strength of the concrete) and furthermore, it has increased strength against the damaging sulfate environmental (gypseous lands and those affected by sea water). Moreover, Hormozgan Cement Co. has succeeded to provide a composition in its Portland cement type 2, which in addition to keeping the 2 mentioned features, it can keep the initial strength as same as Portland cement type 1, so that the observation period (keeping the moisture) following the use of the concrete made of this cement is reduced.

chemical composition
		(%)				(%)
		MIN	MAX			MIN	MAX
Silicon Dioxide	SiO2	۲۰٫۵۰	۲۲٫۰	Insoluble Residue	I.R.	۰٫۱۰	۰٫۷۰
Aluminium Oxide	Al2O3	۴٫۶۰	۵٫۳۰	Free Lime	Free CaO	۰٫۷۰	۱٫۴۰
Ferric Oxide	Fe2O3	۳٫۵۰	۴٫۰۰	Lime Saturation Factor	LSF	۹۲٫۰	۹۷٫۰
Calcium Oxide	CaO	۶۳٫۰۰	۶۵٫۰۰	Silica Module	SiM	۲٫۴۰	۲٫۶۰
Magnesium Oxide	MgO	۱٫۵۰	۲٫۵۰	Alomina Module	AlM	۱٫۲۰	۱٫۴۰
Sulphur Trioxide	SO3	۱٫۵۰	۲٫۵۰	Tricalcium Silicate	C3S	۵۰٫۰۰	۶۰٫۰۰
Potassium Oxide	K2O	۰٫۵۰	۰٫۷۰	Dicalcium Silicate	C2S	۱۵٫۰۰	۲۵٫۰۰
Sodium Oxide	Na2O	۰٫۳۰	۰٫۵۰	Tricalcium Aluminate	C3A	۵٫۰۰	۸٫۰۰
Loss on Ignition	L.O.I	۱٫۰۰	۲٫۵۰	Tetracalcium Alumino Ferrite	C4AF	۱۰٫۰۰	۱۲٫۰۰

C3S=(4.071×CaO)-(7.6×SiO2)-(6.718×Al2O3)-(1.43×Fe2O3)-(2.852×SO3)

C2S=(2.867×SiO2)-(0.754×C3S)

C3A=(2.65×Al2O3)-(1.692×Fe2O3)

C4AF=(3.043×Fe2O3