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In paper coating applications, calcium carbonate is used to make a whiter, brighter sheet. For paper filling applications, calcium carbonate can improve the whiteness of the sheet and reduce costs by replacing expensive fiber and pigments. The chemical properties of calcium carbonate are used to produce non-acidic paper.
Fillers
Ground calcium carbonate is generally recognized for having the best potential as an economic filler-for-fiber substitution. Calcium carbonate also provides advantages in high strength, easier drainage and productivity.

Coating Pigments
The technical and economic advantages of calcium carbonate as paper coating pigments achieve high brightness, low binder demand, better run-ability, and excellent printability and desired gloss.