After the enamel product is fired, the cracks that appear in the porcelain layer are called cracks. It can be found through observation that this kind of cracks often appear on the edges where stress is concentrated. The side cracks are called transverse cracks; the circular ones are called circular cracks.

When this kind of problem occurs, we mainly analyze the reasons from the following aspects:

1. Stress reason: the design of the blank body does not meet the requirements of the enamel process, causing local stress on the porcelain layer; or the enamel frit has poor elasticity and the expansion coefficient is too small, which will cause local stress after firing and cooling;

2. The reason for the porcelain layer: the porcelain layer is too thick, the firing times are too many, the cooling is too fast and the operation is careless. The shape of the crack does not depend on the composition of the enamel, but is only related to the thickness of the ceramic layer, heat treatment and cooling process;

3. Reasons for edge enamel slurry: too much soluble salt in edge enamel slurry, too fine grinding of edge enamel slurry and too long storage time, edge enamel slurry mixed with impurities or container is contaminated;

4. Reasons for billet: poor strength at the edge of billet, uneven welding of billet or excessive distance between welding points;

5. The reason for the ground coat: there are bubbles or insufficient firing at the edge of the ground coat blank;

6. Other reasons: bumps and prying injuries caused by product storage.

Cracks are one of the common problems of enamel products. After they are discovered, the cause should be ascertained immediately, and measures should be taken in time to avoid greater losses. Nolifrit is a professional domestic supplier of enamel frit and inorganic pigments. It has advanced technology, high-end equipment and high-quality products. Over the years, it has provided services and answers questions for countless domestic and foreign companies. If you want to know more Please leave a message for solutions to prevent cracks and solve problems, and we will serve you wholeheartedly.