What Are Porcelain Fillings?

Daily porcelain is a kind of porcelain used in daily life. Porcelain is an object made of porcelain stone, kaolin, quartz stone, mullite, etc., with glass glaze or painted on the outside. Porcelain is formed by firing in a kiln at a high temperature (about 1280 ° -1400 ° C). The glaze color on the surface of the porcelain will undergo various chemical changes due to different temperatures.

Daily porcelain

(A) appearance quality. Consumers can first check the product name and grade indicated in the product box or the document in the box; secondly, the actual quality of the product can be observed with the naked eye. When purchasing, they should choose products with no obvious defects on the surface and regular structure. For plate and bowl products, several products of the same size can be stacked together, and the distance between them can be observed. The uneven distance indicates that the shape of the container is irregular and the deformation is large. For a single product, it can be laid flat or inverted on the glass plate to see if it matches the glass plate to determine its deformation. For porcelain products, you can hold it on your hand and tap the edge of your mouth with your fingers. If it makes a hoarse sound, it means there are cracks.

(2) Colored porcelain products. The surface of the glaze-colored and under-glazed ceramics looks very smooth and has a glass luster. It has no unevenness when it is touched by hand, and is smooth as glass. Because the pigment on the glaze is on the surface of the glaze layer, the texture of the product is obvious when you touch it with your hand, and the surface of the product is uneven.

(Three) use functions. When choosing porcelain for microwave ovens, avoid products with metal decoration, such as products with gold edges, silver edges, or gold flower paper, metal wire, and metal wire inlaid patterns. Products with a dishwasher should use thicker products with arc-shaped reinforcing edges, because these products are not easily damaged during the washing process.

Daily ceramic eating utensils are mostly decorated with flowers, and most of them are decorated with glazes, mainly on-glaze, middle-glaze, and under-glaze. Different decoration methods differ greatly in the content of heavy metal elements such as lead and cadmium. For example, long-term consumption of food containing products containing high levels of lead and cadmium will cause lead to deposit in the blood, cause damage to the central nervous system, kidneys, and other organs, and will also adversely affect the intellectual development of children.

Among them, the content of lead and cadmium in glazes and underglazes and most of the glaze porcelains and white porcelains is very low, and if glaze porcelains use inferior pigments in ceramic flower paper processing, or on the flower surface In the design, if the amount of pigment containing high lead and cadmium is too large, or the temperature and ventilation conditions are insufficient when baking, it will easily cause the amount of lead and cadmium to dissolve. Some white porcelains are mainly uncolored ashes. Because of the use of lead-containing frit glazes, if the firing porcelain is not strictly controlled according to the process conditions of the ashes, there is a high possibility that the amount of lead dissolution exceeds the standard.

The amount of lead and cadmium dissolution in the glaze and under-glaze ceramics is very little or no, so you can rest assured to buy. The glaze products should be used according to different purposes. To reduce the impact of lead content, you can take:

(1) For utensils containing food, attention should be paid to the decoration of the surface in contact with the food.

(2) For vessels used to contain acidic foods, try to use products with less decorative patterns on the surface.

(3) When buying, you should also pay attention to whether the color of the pattern is bright. If it is not bright, the temperature during baking may not meet the requirements. The lead and cadmium dissolution of these products is often high.

(4) Pay special attention to those products that can be wiped off by hand. The amount of lead and cadmium dissolution is extremely high.

(5) For uneasy products, you can soak them in vinegar for several hours, and discard them if you notice a significant change in color.