What Is Crazing In Ceramics

Crazing is fine cracks in the porcelain s glaze.

What is crazing in ceramics.

Crazing is a term used to reference fine cracks that can be found in the glaze of pottery or china. It can also occur in pottery some plastics and composition materials such as the face of a composition doll that has not been properly stored. A craze pattern can develop immediately after removal from the kiln or years later. It happens when a glaze is under tension.

We lakeside pottery know of cases where the pinging sounds of newly developed crazing lines go for many years. Crazing appears when ceramic is cooled and the glaze shrinks more than the clay to which it is rigidly attached. The cause of crazing is the glaze being put under too much tension. Glaze crazing or glaze crackle is a network of lines or cracks in the fired glazed surface.

Crazing is a glaze defect of glazed pottery. They often have a spiderweb like appearance. Crazing can be present in varying degrees. What does crazing mean on china.

They are not cracks in the actual piece of pottery but rather surface level cracks in the fired glazed of the piece. It is caused by a mismatch in the thermal expansions of glaze and body. Characterised as a spider web pattern of cracks penetrating the glaze it is caused by tensile stresses greater than the glaze is able to withstand. Stains can set in and make the crazing more visible and make the dishes look dirty or worn.