What calcium carbonate does in eleven industries, and the Khattco grades that suit each one.
01
Calcium carbonate is the most widely used mineral filler in PVC and other plastics. It replaces part of the more costly polymer, adds stiffness and improves the surface finish. Coated grades disperse more evenly in the polymer than uncoated powder.
02
Filler masterbatch carries a high loading of calcium carbonate in a polymer carrier. It is then blended into film, mouldings and other plastics to reduce the amount of resin needed. Coated powder is preferred because it mixes into the polymer and resists moisture.
03
In paint, calcium carbonate is an extender pigment. It adds bulk and brightness and lowers the cost of the formulation. Finer grades give a smoother film, while coarser grades suit matt finishes.
04
Calcium carbonate is used as a filler in the paper sheet and as a pigment in paper coatings. It raises brightness and opacity and reduces the amount of costly fibre required. Fine, white grades are used.
05
Calcium carbonate is a non black filler for rubber compounds. It adds bulk, lowers compound cost and keeps the colour light where carbon black is not wanted. It does not reinforce rubber the way carbon black does.
06
In adhesives and sealants, calcium carbonate is a filler that adds body, helps control viscosity and flow, and lowers cost. Fine grades give a smooth finish, and coated grades mix well into polymer based systems.
07
In wall putty and tile adhesive, fine calcium carbonate gives a smooth, white finish and good workability. Ground limestone is also used as an extender in cement and concrete mixes. Sized chips serve terrazzo, artificial stone and landscaping.
08
In glass making, limestone supplies calcium oxide, which makes the glass more durable and easier to work. In ceramics, calcium carbonate acts as a flux and filler in tile bodies and glazes.
09
Ground calcium carbonate is spread on acidic soil as agricultural lime. It raises the soil pH and supplies calcium to crops. Finer grades react faster, and coarser grades last longer in the soil.
10
Calcium carbonate is a source of calcium in animal and poultry feed. Laying hens need calcium for eggshell formation, and sized chips and granules are used as grit. Buyers confirm their feed specifications and local rules before ordering.
11
In water treatment, calcium carbonate neutralises acidity and raises pH. In flue gas desulfurisation, a limestone slurry reacts with sulfur dioxide in the gas, and the reaction forms gypsum.
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