Bone China cups are made from the ashes of herbivores and mixed with high-quality kaolin, quartz and other materials and fired at 1280°C. The formation of bone China mainly depends on silica, alumina and calcium oxide. The higher the content of calcium oxide, the better the color. In nature, there are not many sources of calcium oxide, so animal bone meal was chosen as a source of calcium oxide.
Usually, adding 25% bone meal to the raw material can be called bone China, but the most recognized bone China in the world is 45% – 51% bone meal content, with bovine bone being the preferred choice. Through casting, molding embryo, plaster mold dehydration, initial firing, glaze burning, decal paper baking process, high temperature firing, high whiteness, transparency, porcelain fine porcelain, complete the production process.
In the firing process, the regularity, whiteness, transparency, heat and other physical and chemical indicators of bone China advertising cups are very high, so the scrap rate is very high. Due to the fine production of the materials used, the standard is very strict, so the value is higher than other porcelain. The unique firing process and the addition of bone carbon eliminate impurities in porcelain soil, and bone China appears whiter, fine, transparent, light weight, almost no defects, and thinner than ordinary porcelain, with a special sense of cleanliness in the vision, the higher the bone powder content, the lower the composition of viscous soil, the easier it is to crack during the manufacturing process, the higher the technology required for molding, the more difficult it is to burn. It is therefore more precious.
Post time: Sep-29-2023