Which is the more thermal expansion in ceramics Glaze?

In ceramics, glazes typically exhibit higher thermal expansion compared to the clay body they are applied to. This is because glazes often contain materials that expand more upon heating, such as feldspar and silica. The difference in thermal expansion between the glaze and the underlying ceramic can lead to issues like crazing or cracking if not properly matched during the firing process. Therefore, it is essential to consider the thermal expansion properties of both the glaze and the clay body for successful ceramic applications.