It is a kind of porcelain for daily utensils, coffee utensils and bone utensils, which is suitable for making soft porcelain and bone utensils. Bone china is a kind of porcelain with calcium phosphate as the main component. It is a kind of "calcium phosphate kaolin time feldspar" system porcelain with calcium phosphate as the solvent. Sometimes other components are added. White soft bone porcelain takes calcium phosphate as the main raw material, and the content of iron and titanium in the body formula is very small. Calcium phosphate appears soft white after firing, so what's special about the characteristics of bone china?
1. White and soft
Because bone china takes calcium phosphate as the main raw material, the content of iron and titanium in the body formula is very small. After firing, calcium phosphate presents a soft white, which is neither the cold white of general traditional white porcelain nor the hard white of talc porcelain, but a comfortable milky white.
2. Good light transmittance
The refractive index of phosphate glass in bone china is very close to that in time, so it has less light loss, better light transmittance and better translucency.
3. The shape is regular.
Bone China adopts the secondary firing process of high-temperature plain firing and low-temperature glaze firing. When firing, it adopts the forced firing of profiling sagger, so the product shape is regular, which is unmatched by ordinary ceramics. The sagger of bone china making group has high requirements. Some products, especially plates, even if the semi-finished products are deformed, as long as the regular profiling sagger is used during firing, the products can be formed and become regular after firing, which is one of the advantages of the secondary firing process.
4. The glaze is smooth.
Due to the extensive use of frit glaze in Bone China, frit glaze is a pretreated glass body, which reduces the reaction and the possibility of more bubbles compared with ordinary raw glaze. Therefore, the glaze of Bone China is smoother than that of ordinary ceramics, and the gloss is generally more than 100%.
5. Light and elegant
Porcelain uses imitation sagger buckle firing to solve the deformation problem, so the product can be made thinner without worrying about deformation, which is unmatched by ordinary ceramics. It can be more refined, lighter and more elegant according to the requirements of designers.