MOISTURE – maximum content (0.50 %)
In order to precondition the material properly, Limestone is dried.
SULPHUR – maximum content (0.05%)
Presence of Sulphur should be lower than 0.1% for the limestone to be dense, massive and non-fretting on burning. We have less than 0.05%.
PHOSPHORUS – maximum content (0.05%)
The high amount of Phosphorus (P4) causes lime to become embrittled, thus reducing the toughness.
IRON OXIDE – maximum content (0.20%)
Iron Oxide is a chemical compound found in rocks and minerals including limestone. The presence of Fe2O3 remains at its maximum of 0.20%.
ALUMINIUM OXIDE – maximum content (0.30%)
Aluminium Oxide is a white, colourless, odourless and insoluble crystalline substance. It is diminished to maximum 0.30% in the limestone composition.
SILICON DIOXIDE – maximum content (1.00%)
Limestone rock contains crystalline Silicon Dioxide (SiO2) in different quantities.
MAGNESIUM OXIDE – maximum content (1.20%)
Magnesium Oxide is found in the standard composition of Limestone. The presence of MgO is maintained at a maximum level of 1.20%.
CALCIUM OXIDE – minimum content (53.50%)
Calcium Oxide is a widely used alkali substance known as quicklime, burnt lime or calcia. The Presence of CaO ranges from minimum of 53.50%.