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What is colored glaze glass?
2022-09-08
Glaze, also known as colored glaze (such as cobalt blue, pink, and others), is a low-temperature firing technique used to color ceramics, typically at temperatures ranging from about 700°C to 800°C. Additionally, before firing in the kiln, decorative painting—such as blue-and-white or underglaze red—is applied directly onto the unglazed porcelain body. This method, called "underglaze red," is characterized by its vibrant colors that remain unfaded even after being fired at high temperatures beneath the glaze.
Glass is an amorphous inorganic non-metallic material, typically made from various inorganic minerals such as quartz sand, borax, boric acid, barite, barium carbonate, limestone, feldspar, soda ash, and more—often with small amounts of auxiliary additives. Its primary components include silicon dioxide and other oxides. The chemical composition of common glass is usually expressed as Na₂SiO₃·CaSiO₃·SiO₂ or Na₂O·CaO·6SiO₂, with silicate complex salts forming the bulk of its structure. This material exists as an irregularly structured, non-crystalline solid. Glass is widely used in construction to control wind and light, classifying it as a mixture. Additionally, colored glass is produced by blending certain metal oxides or salts, while tempered glass is created through physical or chemical processes. Occasionally, some transparent plastics—such as polymethyl methacrylate—are also referred to as "organic glass."
Using plastic extrusion and molding, the process begins by feeding loose granular or powdered raw materials from an injection machine into a high-temperature cylinder, where they are heated, melted, and plasticized into a viscous fluidic melt. This melt is then injected into a mold under controlled pressure and at a specific speed to maintain consistent pressure. After cooling, the mold is opened, yielding a plastic product with a precise shape and size.
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