CaCO

Calcium carbonate (CaCO₃) is an inorganic ceramic compound and one of the most abundant minerals in nature, commonly occurring as limestone, chalk, and marble. It is widely used as a filler, reinforcing agent, and functional additive in polymers, coatings, adhesives, and construction materials, valued for its cost-effectiveness, availability, and ability to improve stiffness and processing characteristics. Engineers select CaCO₃ over alternatives when seeking an economical way to increase material volume, improve dimensional stability, or reduce resin content in composites, though its use is generally limited to non-critical, non-load-bearing applications where its moderate strength is acceptable.