Classification of ceramics


This article will introduce the most common classification of ceramic foreign trade products. Understanding these contents will be more beneficial for consumers to purchase daily necessities made of ceramic materials.

First of all, it is divided into over-glaze color and underglaze color. Over-glaze painting is done after the ceramic body is coated with glaze. It is fired twice, with the body fired at high temperature and the pigments fired at low temperature. Because it is an over-glaze color, it has a concave and convex feel to the hand and rich colors. Because the color is fired at a low temperature, the color does not change much. It is generally used as a display item, and the paint is fired at a low temperature and is easy to fall off and wear. As tableware, it has certain risks and can produce harmful substances to the human body. It is not recommended that consumers purchase over-glaze colored tableware. There are two firing methods for underglaze painting. One is to paint directly on the dried blank, and then glaze it and fire it in one go. The temperature is about 1200°-1300°. The second method is to first fire the blank at low temperature, then paint and glaze it, and finally fire it at high temperature. Since underglaze is fired at high temperatures, there are not many colorants that can withstand high temperatures, making it difficult to control the color. At the same time, underglaze color is the glaze water on the surface. Ceramic products are smoother, have good durability, and have high safety performance, so they are highly recommended for use as tableware. Of course there is also an unusual glaze color. The firing process of the glaze must be to first bake the blank at a low temperature, then paint and glaze it, and finally fire it at a high temperature. The glaze color also has a smooth and delicate surface, but there are fewer color choices. At the same time, the cost of under-glaze color is higher, and under-glaze color is more preferable in terms of production and cost performance.

As a consumer, how do you distinguish between over-glaze and underglaze colors? First, look at the color. Since underglaze colors are fired at high temperatures and there are fewer high-temperature resistant pigments, those with bright colors are generally more likely to favor over-glaze colors. The second is touch. Over-glazed ceramic products will have a concave and convex feel to the touch, and you can feel the pigment. The color and glaze of the underglaze color are integrated, and the surface is smooth. But now more consumers are purchasing online and cannot touch the products. From the color point of view, it will be safer to choose products with a single color. It can also be distinguished from the unit price of the product. The price of over-glaze color will be much lower than the price of underglaze color.

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