1. The main raw material of ceramics is kaolin. High-quality kaolin is non-toxic and has small microwave dielectric loss. Ceramics made of this kaolin can be put into the oven without toxicity. However, some ceramics made of kaolin mixed with metal impurities are not suitable for microwave containers. If put in the microwave oven, it may be toxic and cannot be used.

2. If the colored glaze on the ceramics is inferior, putting such ceramics in the oven will also cause toxic spillover.

3. Frozen ceramics should not be put into microwave oven immediately. Experienced people all know that if you put the ceramics and pottery just taken out of the refrigerator into the microwave oven at once, they are likely to burst.

4. Ceramic bowls with metal edges are not suitable for microwave ovens. Metal products can't be put in the microwave oven, so if there are metal edges or metal patterns on the ceramic bowl, don't put it in the microwave oven.

Extended data

The traditional concept of ceramic tableware and ceramics refers to all artificial industrial products with inorganic non-metallic minerals such as clay as raw materials. It includes various products made of clay or clay-containing mixture through mixing, molding and calcination. From the roughest earthenware to the finest exquisite ceramics, it belongs to its scope.

Its main raw materials are silicate minerals (such as clay, feldspar, timely, etc. ) is taken from nature, so it belongs to the category of "silicate industry" together with glass, cement, enamel, refractory and other industries. The firing and application of ceramic tableware has a long history in China, and it is deeply loved by Chinese people because of its diverse shapes, bright colors, cool and smooth feel and easy washing.

The production methods of ceramic tableware are divided into three types: over-glaze color, under-glaze color and in-glaze color. Over-glaze colored ceramics are made by pasting colored paper made of pigments on the glaze surface or painting directly on the surface of products with pigments, and then firing at low temperature. Because the firing temperature can't reach the melting degree of the glaze layer, the color surface can't sink into the glaze.

Touch glazed ceramics with your hands, and you will feel the picture is obviously concave and convex; The firing temperature of colored porcelain in glaze can melt the glaze and the pigment can sink into the glaze. After cooling, the product is covered by glaze layer, and the surface of the product is smooth, and there is no obvious concave-convex feeling when touched by hand. All underglaze colored ceramics are decorated on the porcelain blank. After glazing, the surface of the flower is covered with glaze layer after a high temperature firing, which looks bright, flat and smooth.