What Is Crazing In Ceramics

Sometimes items may have a couple of crazing lines on one side and not the other other times the crazing can look like a spider web and cover the entire item. Crazing is a term used to reference fine cracks that can be found in the glaze of pottery or china. Crazing is fine cracks in the porcelain s glaze.

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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.

What is crazing in ceramics.

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. Glaze crazing or glaze crackle is a network of lines or cracks in the fired glazed surface. Stains can set in and make the crazing more visible and make the dishes look dirty or worn. A craze pattern can develop immediately after removal from the kiln or years later.

It is caused by a mismatch in the thermal expansions of glaze and body. Crazing appears when ceramic is cooled and the glaze shrinks more than the clay to which it is rigidly attached. We lakeside pottery know of cases where the pinging sounds of newly developed crazing lines go for many years. Crazing translates to fine cracks in the glaze or surface layer of porcelain wares.

Crazing is a glaze defect of glazed pottery. The cause of crazing is the glaze being put under too much tension. Crazing can be present in varying degrees. Crazing refers to small hairline cracks in glazed surfaces that usually appear after firing but can appear years later.

They often have a spiderweb like appearance. 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 happens when a glaze is under tension.

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