Why bone china manufacturers' bone china is recognized as high-grade in the world

Bone china 1, whiteness of bone china manufacturer is not less than 80%. 2. The content of tricalcium phosphate in the porcelain tire is not less than 36%. 3. The water absorption rate does not exceed 0.5%. 4. Thermal stability: 140°C into 20°C water for heat exchange without cracking once. 5. The weight error is 5%. 6. Each product does not exceed four kinds of defects and cannot be dense. The formation of bone china mainly relies 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 is chosen as the source of calcium oxide. Bone china is actually a bone china product made from herbivore ashes (mainly Ca3(PO4)2) as raw materials, mixed with high-quality kaolin, quartz and other auxiliary materials, and glaze-fired at 1280°C. Generally speaking, bone china can be called bone china by adding 25% of bone powder to the raw material. However, the best bone china recognized in the world today has a bone powder content of 45% to 51%, and bovine bone is preferred. The production process goes through grouting, mould pressing embryos, dehydration of plaster moulds, as well as preliminary firing, glazing firing, and decal baking. After high temperature firing, it becomes a porcelain with high whiteness, high transparency and fine porcelain. During the firing process of bone china, its regularity, whiteness, transparency, thermal stability and other physical and chemical indicators are all required to be extremely high, so the rejection rate is very high. Due to the exquisite materials, fine production, and strict standards, the value is higher than other types of porcelain. The unique firing process and the addition of bone char, make the impurities in the porcelain clay eliminated, and the bone china appears whiter, finer, transparent, lighter, less flawed, and thinner than ordinary porcelain, and has a special visual cleaning. The sense and strength are higher than ordinary porcelain and twice that of daily-use porcelain white porcelin dinnerware. The higher the content of bone meal, the lower the composition of the clay, the easier it is to burn during the production process, and the higher the forming technology is required, which increases the difficulty of firing, so it is more precious. Someone has done such an experiment. Putting 4 bone china cups under the wheels of a Rolls Royce, these 4 crystal cups are capable of supporting the weight of the touring car! High-end porcelain also includes shell porcelain and pearl porcelain, which are similar to bone china. Due to the high cost, there is almost no industrial production, so bone china is recognized as the most high-end porcelain in the world.

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