Calcium Carbonate

Calcium Carbonate (main component CaCO₃) is an important additive whose properties are closely related to its uses. As an inexpensive source of calcium, it decomposes into calcium oxide (CaO) and carbon dioxide (CO₂) during the sintering process. This characteristic gives it two main functions: firstly, calcium oxide acts as a flux and sintering aid, effectively lowering the sintering temperature of the body, promoting glass phase formation, and improving the density and translucency of the ceramic; secondly, in glazes, it regulates the thermal expansion coefficient of the glaze, ensuring it matches the body, preventing cracking, and enhancing the gloss, hardness, and opacity of the glaze surface. Furthermore, it is a key raw material in the production of bone china, giving the porcelain its unique crystalline appearance and high mechanical strength. However, the dosage must be precisely controlled, as excessive amounts can lead to a narrower firing range for the body, pinholes in the glaze, and even subsequent moisture absorption and expansion.

TOPLUS Calcium Carbonate is produced through refining, purification, and particle size control. Its products boast extremely high purity, a narrower particle size distribution, and a more regular morphology. As an additive, it disperses more evenly in the ceramic body and glaze, which not only improves the uniformity and efficiency of the sintering reaction, resulting in better density, translucency, and glaze gloss, but also significantly reduces defects such as pinholes and spots caused by impurities or agglomeration. Ultimately, this improves the yield, mechanical strength, and stability of ceramic products.