What is ceramic dinnerware?
The traditional concept of ceramics refers to all artificial industrial products that use inorganic non-metallic minerals such as clay as raw materials.
It includes various products made by mixing, shaping and calcining clay or a mixture containing clay. It ranges from the roughest earthenware to the finest fine pottery and porcelain.
Its main raw materials are silicate minerals (such as clay, feldspar, quartz, etc.) taken from nature, so it belongs to the same category of “silicate industry” as glass, cement, enamel, refractory and other industries. The firing and application of ceramic dinnerware has a long history in my country. It has various shapes, colorful colors, cool and smooth hand feel, easy to wash, and is deeply loved by the Chinese.
The production methods of ceramic dinnerware are divided into three types: on-glaze color, under-glaze color, and in-glaze color. On-glazed ceramics are made of colored paper with pigments, which are pasted on the glaze or painted directly on the surface of the product, and then baked at low temperature. Since the baking temperature cannot reach the level of melting of the glaze layer, the flower surface cannot sink. into the glaze.
When you touch the on-glaze ceramics with your hands, you can feel that the flower surface has obvious bumps; the baking temperature of the on-glaze ceramics can make the glaze melt, and the pigment can sink into the glaze. After cooling, it will be covered by the glaze layer. There is no obvious bump to the touch; all the underglaze ceramics are decorated on the porcelain blank. After glazing, they are fired at a high temperature. The flower surface is covered by the glaze layer, which looks bright, flat and feels smooth.
Ceramic dinnerware grades are generally divided into:
Class 1: The entire product is free of any defect, deformation or color difference, allowing a pinhole in an inconspicuous place;
Grade 2: There can be 2-3 pinholes, no obvious color difference, slight deformation;
Level 3 (close to defective product): obvious color difference, slight deformation, and shrinking glaze of about 1 square MM is allowed in 1-2 places.
What are the conveniences of ceramic dinnerware?
●For ceramic dinnerware containing food, attention should be paid to the decoration of the surface in contact with the food.
●Ceramic dinnerware used to hold acidic food should try to use products with less decorative patterns on the surface.
●Pay attention to whether the color of the pattern is bright. If it is not bright, it may be that the temperature does not meet the requirements when baking the flower. The lead and cadmium dissolution of such ceramic dinnerware products are often high.
● Pay special attention to those ceramic dinnerware whose patterns can be wiped off by hand.
●For uneasy ceramic dinnerware, soak it in vinegar for a few hours. If it is found that the color has changed obviously, it should be discarded.
● When purchasing products for microwave ovens, avoid products with metal decorations, such as products with gold edging, silver edging or inlaid patterns with golden paper, metal wire and metal wire.
How to choose excellent ceramic dinnerware?
When buying and using ceramic dinnerware, pay attention to the following points:
1. To buy ceramic dinnerware, you must choose the formal market, and you must not buy cheap products without formal manufacturers. The state stipulates that when the ceramic dinnerware is soaked in 4% acetic acid, the dissolution amount of lead shall not be greater than 7 mg/L, and the dissolution amount of cadmium shall not be greater than 0.5 mg/L. The products of regular manufacturers can basically meet this requirement;
2. When purchasing, pay attention to the color of the dinnerware, touch the surface of the dinnerware with your hand to see if the inner wall is smooth;
3. Whether there is any peculiar smell with the nose;
4. Do not buy ceramic dinnerware that is too bright in color. In order to make the color bright, the manufacturer will add some heavy metal additives to the glaze color. Therefore, the brighter the color of the dinnerware, the easier the heavy metal exceeds the standard;
5. In-glaze and under-glaze color dinnerware should be purchased with raw materials and strict process control.
Buy some beautiful and qualified ceramic dinnerware when moving to a new house, getting married, and welcoming the New Year. Nowadays, the ceramic dinnerware sold in the market has novel patterns and various varieties, but the Healthy Life account reminds that if the price of ceramic dinnerware is low and the quality is relatively poor, it will emit some substances that are harmful to the body. Such ceramic dinnerware must not be purchased. So, what kind of ceramic dinnerware is good?
How to distinguish the pros and cons of ceramic dinnerware?
Buying porcelain can pass, “listen”, “compare” and “try” three items. The specific methods are as follows: “Look” is to carefully observe the porcelain up and down, inside and out. Check whether the glazed surface of the porcelain is smooth and smooth, with or without scratches, small holes, black spots and air bubbles; second, whether the shape is regular and deformed; third, whether the picture is defective; fourth, whether the bottom is flat, and must be placed smoothly and without burrs .
“listen”
It is to listen to the sound made when the porcelain is tapped lightly. If the sound is crisp and pleasant, it means that the porcelain body is fine and dense without cracks. When fired at high temperature, the porcelain is completely transformed and the quality is relatively good.
“Compare”
Just compare. For matching porcelain, it is necessary to compare the accessories to see whether the shape and picture decoration are consistent. Especially the complete set of blue and white or blue and white exquisite porcelain, because the color of blue and white varies with the firing temperature, so it is the same blue and white porcelain, the color is dark or light, a set of several or even dozens of cold porcelain, such as each piece. There are obvious differences in the color of blue and white, and this set of porcelain is greatly inferior.
“try”
It’s a test cover, a test fit, a test. Some porcelain has a lid, and some porcelain is composed of several components. When choosing porcelain, don’t forget to try the lid and try to assemble the components to see if they are suitable.
Through the above three methods, you will know what kind of ceramic dinnerware is good.
in accordance with
Although the color painting on the inner wall of ceramic dinnerware is bright, the color glaze contains heavy metal elements such as lead, mercury and cadmium. Among them, cadmium and lead are easy to cause liver or other internal organs poisoning, and mercury can cause liver and kidney cirrhosis. The more glazes on ceramics, the brighter the colors, and the more compounds such as lead and cadmium.
Health advice: Don’t pay too much attention to patterns when choosing ceramic dinnerware, especially don’t use dishes with painted inner walls. Newly bought dinnerware can be soaked in vinegar for 2 to 3 hours to dissolve the harmful substances in the color glaze. In addition, the colored porcelain must not be heated in the microwave oven.
Underglaze porcelain is the safest, and the pattern color is more blue and green, less red and yellow.
Underglaze color is first to paint, then glaze, and then directly fired at high temperature. Since no low melting point substance is required, there is no need to add lead to the pigment, and the pigment is not easy to precipitate, which is the safest; underglaze color is glazed first. , and then paint, and then fired at high temperature, without lead, the pigment is difficult to precipitate, relatively safe.
Where the underglaze has a pattern, the hand feel is as smooth as other places, and the gloss is very good, while the underglaze color is in between, although the gloss is better, but the hand is not smooth.
Post time: Jun-16-2022