Calcium carbonate
Calcium carbonate (CaCO₃) is a white mineral filler and pigment, chemically stable and practically insoluble in water under normal conditions. It features high brightness, good opacity and a wide range of available particle sizes, from coarse ground grades to ultrafine and precipitated types. Owing to its cost‑effectiveness, availability and tunable properties, it is one of the most important mineral additives in the paper, plastics, rubber, coatings, construction and adhesives industries.
Source
- obtained naturally by grinding limestone, marble and chalk with controlled purity and particle size distribution
- precipitated (synthetic) calcium carbonate is produced by reacting calcium hydroxide solution with carbon dioxide
- offered in various quality levels: technical, industrial, high‑purity and specially surface‑treated grades
- processing steps (dry and wet grinding, classification, coating) allow precise adjustment of particle and rheological properties
Variations
- ground calcium carbonate (GCC) – natural grades with different fineness and particle shapes for standard applications
- precipitated calcium carbonate (PCC) – controlled particle size and morphology for demanding optical and rheological requirements
- surface‑treated CaCO₃ (e.g. stearate, silane) – with improved dispersibility and compatibility in polymers and binders
- special particle size distributions for high‑filler‑load, low‑viscosity systems and formulations with enhanced mechanical properties
Applications In The Industry
Paper industry
In the paper industry, calcium carbonate is used as a pigment and filler for fine, graphic and packaging papers. It increases brightness, opacity and smoothness, improving printability and overall optical appearance. In neutral and slightly alkaline papermaking systems, CaCO₃ contributes to higher durability, stable pH and optimized use of optical brightening agents.
Plastics industry
In plastics, calcium carbonate serves as a filler in PVC, polyolefins, styrenics and other thermoplastics. It reduces formulation costs while improving stiffness, dimensional stability and scratch resistance. Finely dispersed and surface‑treated grades ensure good processability, stable rheology and consistent appearance of finished products such as films, pipes, profiles and injection‑molded parts.
Rubber industry
In rubber products (technical rubber goods, hoses, profiles, footwear), CaCO₃ is used as a cost‑efficient filler to control hardness, strength and compound processability. It helps to adjust viscosity during mixing and extrusion, reduce shrinkage and obtain uniform surface quality. In combination with reinforcing fillers such as carbon black, it enables optimization of mechanical performance and compound cost.
Paints and coatings industry
In the paints and coatings industry, calcium carbonate is a functional filler and extender pigment in decorative, industrial and powder coatings. It improves rheology, crack resistance and sandability, while helping to control gloss and matting. By proper selection of particle size, formulators achieve good coverage, film smoothness and storage stability, with reduced demand for more expensive TiO₂ pigments.
Construction industry
In construction materials, CaCO₃ is a key component in dry mortar mixes, tile adhesives, grouts, self‑levelling floors and decorative facade systems. It controls workability, rheology and crack resistance, contributes to volume filling and dimensional stability. Its chemical inertness and whiteness support a stable appearance and long‑term durability of finished systems.
Adhesives and sealants industry
In adhesives and sealants, calcium carbonate is used to increase viscosity, control sagging and improve the mechanical strength of the cured bond. It enables high filler loading in dispersion, PU, silicone and hybrid systems, optimizing cost and reducing shrinkage during drying or curing. The choice of fine or coarser grades allows tailoring of structure and workability (application behavior, smoothing, open time).
Benefits Of Use
- wide range of grades (GCC, PCC, treated) for precise adjustment of optical, rheological and mechanical properties
- cost‑effective filler that reduces formulation costs while maintaining or enhancing performance
- chemically inert, thermally stable and easy to incorporate into various systems (waterborne, solvent‑borne, polymer‑based)
- high brightness and opacity, with good compatibility with modern binders and additives
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