Industrial calcium carbonate (CaCO₃) is one of the most important non-metallic mineral fillers used worldwide. Thanks to its abundance, cost efficiency, and versatile properties, it is widely applied in plastics, rubber, paper, coatings, ceramics, and construction. To meet different performance requirements, calcium carbonate is categorized into several main types.
1. Ground Calcium Carbonate (GCC)
Also called heavy calcium carbonate, GCC is produced by grinding natural limestone, marble, or calcite into fine powder. It keeps the original crystal structure, which gives it good mechanical strength and stability. GCC is widely used in plastics, rubber, building materials, and paper due to its affordability and large-scale availability.
2. Precipitated Calcium Carbonate (PCC)
PCC is manufactured chemically by reacting lime with carbon dioxide to form fine particles. The process allows precise control over particle size and shape, producing powders that can be cubic, spherical, or needle-like. With higher purity and whiteness, PCC is favored in high-value applications such as paper coating, adhesives, paints, and even food and pharmaceutical products.
3. Nano Calcium Carbonate
Nano CaCO₃ has particle sizes smaller than 100 nanometers. Its unique surface properties, large specific surface area, and strong reinforcing effect make it an advanced functional material. It is mainly used in high-performance plastics, sealants, inks, and specialty coatings to enhance strength, gloss, and processing stability.
4. Surface-Modified Calcium Carbonate
To improve compatibility with organic materials, calcium carbonate can be treated with stearic acid or silane coupling agents. Modified CaCO₃ disperses better in polymers and enhances mechanical properties, making it ideal for plastic compounding, rubber products, and coatings.
Conclusion
The main types of industrial calcium carbonate are GCC, PCC, nano calcium carbonate, and surface-modified grades. Each has unique features and application advantages. Selecting the right type helps manufacturers improve product quality, reduce costs, and optimize performance across different industries.
