How can the ceramic tableware distinguish 28 heads and 56 heads?
In nature, there are not many sources of calcium oxide, so bone dust from animals is chosen as the source of calcium oxide.China is a unique nature of natural bone powder milk white. Generally speaking, raw materials containing 25% bone porcelain can be called bone china, the internationally recognized bone content than 40%, best quality Bone China contains 51% of the best bone powder. The bone component is more than 40%, appliance color is more white, high-grade bone porcelain. Only a small number of factories in Tangshan, Zibo and other places produce export products.After the grouting, molding, embryo, plaster mold dehydration, as well as the initial burning, glaze burning, decal baking process, high temperature firing, to become high whiteness, high transparency, porcelain delicate porcelain. Bone China in the firing process, its regularity, whiteness, transparency, thermal stability and other physical and chemical indicators are demanding, resulting in a high rate of waste.
56 and 28 refer to the general specifications, 56 head contains a 4.5 inch bowl 10, 10 Chinese dishes, a small bowl of spoon needle 10, 10, 8 inch flat 3, 8 inch soup 4, 8 inch orthotropic plate 3, the pot 1, 12 inch fish dish 1 a 10 inch flat 1, 1 ashtrays, toothpicks 1 spoon, 1, a total of 56, called the 56 head.In addition, the 28 specifications are relatively small, there are 6 bowls of rice, 6 spoons, 6 dishes, chopsticks rack 6, plates 3, pan sets of 1, this is more suitable for family use less.The rest have 24 heads, 40 heads, 60 first class.Bone ChinaCalled bone china, was invented by the British in 1794. Because in the clay with cattle, sheep and other herbivores (ashes with cow bone powder is good) and its name, is the green environmental protection.The formation of Bone China depends mainly on silica, alumina and calcium oxide, the higher the content of calcium oxide, the better the color.
Due to sophisticated materials, fine production, strict standards, so the value is higher than other kinds of porcelain. Join the firing process and bone carbon unique, the impurities in the clay was removed, bone is more white and delicate, transparent, lightweight, small flaws, and thinner than general China, there is a special kind of clean feeling in the vision, the intensity is two times higher than general porcelain, daily-use porcelain. The higher the content of bone powder, the clay composition is relatively low, in the process of making the more easy to burn crack, in the shape of the need for higher technology, increased the difficulty of burning, so more precious.In one experiment, the 4 Mug pad on a Rolls-Royce under the wheels, the 4 crystal glass was capable of supporting the weight of the car!High-grade bone china porcelain (bonechina), shell porcelain, pearl porcelain etc.. As the shell porcelain, pearl porcelain almost no industrial production cost is too high, so China is the world's most recognized high-grade porcelain.
