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Is the colored glaze on the ceramic water cup harmful to the human body?

May 05, 2023

Whether it is a ceramic water cup or a color-changing cup, there is a layer of ceramic glaze on the surface. Ceramic glaze is a continuous glassy layer attached to the surface of the ceramic body. The glazes used in the production of modern daily-use ceramics are divided into lime glaze and long ancient glaze. .

 


Lime glaze is made of glaze fruit (a natural mineral material similar to porcelain stone) and gray glaze (mainly composed of calcium oxide). Feldspar glaze is mainly composed of quartz, feldspar, marble, kaolin, etc. Adding metal oxides to lime glaze and long ancient glaze, or infiltrating other chemical components, will become a variety of glaze colors. There are many types of glazes. According to the body, there are porcelain glazes, pottery glazes and flint glazes; according to the firing temperature, glazes fired below 1100°C are called low-temperature glazes, and glazes fired between 1100°C and 1250°C are called low-temperature glazes. The finished glaze is a medium-temperature glaze, and the glaze fired above 1250°C is a high-temperature glaze; classified according to the characteristics of the glaze surface, there are white glaze and colored glaze, crystal glaze, kiln-changed glaze, cracked glaze, dull glaze, opacified glaze, salt Glazes, etc.; low-temperature lead glazes using lead as a flux are partially used in ornamental pottery works, and daily-use porcelain is no longer used, so daily-use ceramic color glazes fired at high temperatures are non-toxic and safe.


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