Peeling is a defect in ceramic products where the glaze lifts or separates from the body of the product. This defect is also known as shivering. It is basically the opposite of crazing.
Peeling happens during the cooling stage after firing. As the ceramic product cools, both the glaze and the body contract. If the body shrinks more than the glaze, the glaze is left under compression. When this compression becomes too strong, the glaze separates or peels off from the surface of the body.
The root cause of peeling is a mismatch in the Coefficient of Thermal Expansion (CTE) between the glaze and the body. In peeling, the glaze has a lower CTE than the body. This means the glaze shrinks less than the body during cooling, creating a gap and causing separation between the two layers.
This is the opposite of crazing, where the glaze shrinks more than the body. In peeling, the body puts too much pressure on the glaze from underneath, and the glaze breaks away from the surface in small flakes or chips.
To prevent peeling in ceramic products, the following steps should be taken:
Peeling leaves sharp edges and rough patches on the ceramic surface. This not only makes the product look bad but also makes it unsafe to use. Products with peeling defects are rejected in quality inspection as the glaze loss cannot be repaired after firing.

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Crazing Defect in Ceramics: Causes, Analysis & Prevention
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