The bone china is milky white, with soft luster and warm as jade. If you don't believe it, you can take a bone china cup or bowl and put it under the light. The delicate and transparent porcelain will make you admire; the glazed surface of the bone china is smooth. Crystal clear, ordinary tableware can not be compared with bone china; if you put a bone china bowl on your hand, use your thumb and middle finger to gently play a bullet, you will hear a "clam" Loud, like the beautiful hum of the instrument, it is exciting; the bone china becomes light and noble because of its thinness.

Tangshan bone quality technical requirements I. Main raw materials 1. Porcelain clay: Select the porcelain clay that meets the specified content in the area of ​​origin. 2. Second, the process flow 1. Tangshan bone porcelain white porcelain: raw material processing → molding → high temperature burning → low temperature glaze burning → white porcelain. 2. Third, the processing technology requirements 1. Tangshan bone china white porcelain main process: (1) raw material production: 1 raw material: using the specified content of porcelain clay and bone carbon within the protected area. Porcelain soil chemical composition: porcelain soil chemical composition index burning name minus not less than % name no more than % no more than % Zimu Festival Al2O3SiO234.548.01Fe2O30.515 feldspar K2O+Na2O13Fe2O30.5-quartz SiO296---K18Al2O330Fe2O30.316 oxalic acid H2C2O4 .2H2O95---PbO content of lead-free frit: 0Fe2O30.1-bone carbon chemical composition: bone carbon chemical composition burning reduction name not less than % name not higher than % not more than %P2O544.9Fe2O354.830.27 2 raw material processing technology: Ball milling method, fineness of raw material granules (specific gravity 1.70, per 500ml sieve residue): the sieve residue of machine mud is 0.05g-0.09g, and the sieve residue of grouting mud is 0.15g-0.25g, glaze The sieve residue is from 0.01 grams to 0.05 grams. (2) Molding: According to different product types, roll forming, grouting forming, hot die casting, etc. are selected. Among them, the rolling mud water contains 20% to 25%, and the grouting mud contains about 30% water. The hot die casting uses pure Tangshan bone china porcelain porcelain powder. (3) Pyrolysis: The green body is charged into a kiln for firing, and the temperature of the firing is 1240 ° C to 1255 ° C. (4) Glazing: glazing is applied to different types of products by means of artificial glazing and mechanical glazing. (5) Low-temperature glaze burning: The glaze blank is placed in a glaze kiln for firing, and the firing temperature is from 1100 ° C to 1150 ° C. After firing, it is the finished Tangshan bone china porcelain. 2. (2) Roasting: The decorated product is roasted in a roasting kiln at a temperature of 700 ° C to 900 ° C. Fourth, the quality characteristics 1. Sensory features: (1) Tangshan bone porcelain white porcelain: good transparency, crystal, white, translucent, natural color milk white, porcelain light and delicate, the sound of knocking is crisp, the sound is pleasant. (2) Tangshan bone china porcelain: natural milk white with color decoration, decorative effect is good; carved blank decoration under the lamp, the light transmission effect is good. 2. The heat exchange at 160 ° C to 20 ° C does not crack once. 3. Safety and other quality technical requirements: Product safety and other quality technical requirements must comply with relevant national regulations.

Apply to：
The producers in the Tangshan bone china production area may apply to the Tangshan Municipal Bureau of Quality and Technical Supervision of Hebei Province for the use of the “Special Mark for Geographical Indication Products”, which shall be reviewed by the Hebei Provincial Bureau of Quality and Technical Supervision and announced to the General Administration of Quality Supervision, Inspection and Quarantine for approval. . The legal inspection agency of Tangshan Bone Porcelain is designated by the Hebei Provincial Bureau of Quality and Technical Supervision.