Ground Calcium Carbonate

GCC shows good chemical stability under normal storage, handling, and conventional polymer-processing conditions. Its predominantly Calcite-based mineral structure exhibits low solubility in neutral water and generally maintains its chemical integrity in non-acidic environments, making it suitable for a broad range of industrial formulations.

As an alkaline-earth carbonate, GCC can react with acidic substances, resulting in carbonate dissolution and the release of Carbon dioxide (CO₂). At high temperatures, Calcium carbonate may undergo thermal decomposition into Calcium oxide (CaO) and Carbon dioxide (CO₂), with the decomposition behavior governed by temperature, carbon dioxide partial pressure, particle characteristics, and processing conditions.

Within appropriate operating conditions, GCC provides a chemically stable mineral phase that can support consistent formulation properties, dimensional stability, and reliable processing performance in Polyvinyl chloride (PVC) compounds, Polyolefin masterbatches, rubber, coatings, and other composite materials. 

GCC is a highly efficient mineral filler that enables manufacturers to optimize formulation costs while modifying the physical, mechanical, and processing characteristics of polymer-based materials. Its effectiveness is primarily governed by particle size distribution, particle morphology, specific surface area, surface treatment, dispersion quality, and interfacial interactions with the polymer matrix.

When appropriately selected and uniformly dispersed, GCC can increase composite stiffness, improve dimensional stability, reduce thermal expansion, and contribute to consistent processing behavior. Fine-particle and surface-treated grades can enhance compatibility with polymer matrices, particularly in PE, PP, and PVC formulations, by improving particle wetting and reducing agglomeration.

The incorporation of GCC allows partial replacement of polymer resin, potentially reducing raw material costs while maintaining the required balance of mechanical properties and processability. Its effects on impact strength, tensile strength, elongation at break, melt rheology, and final product density depend on filler loading, particle characteristics, surface modification, and formulation design.