What Is Crazing In Ceramics

Crazing can be present in varying degrees. It happens when a glaze is under tension. 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.

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It is caused by a mismatch in the thermal expansions of glaze and body.

What is crazing in ceramics.

Crazing refers to small hairline cracks in glazed surfaces that usually appear after firing but can appear years later. They are not cracks in the actual piece of pottery but rather surface level cracks in the fired glazed of the piece. 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.

What does crazing mean on china. Crazing is a term used to reference fine cracks that can be found in the glaze of pottery or china. Crazing appears when ceramic is cooled and the glaze shrinks more than the clay to which it is rigidly attached. They often have a spiderweb like appearance.

We lakeside pottery know of cases where the pinging sounds of newly developed crazing lines go for many years. Glaze crazing or glaze crackle is a network of lines or cracks in the fired glazed surface. The cause of crazing is the glaze being put under too much tension. Crazing is a glaze defect of glazed pottery.

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. 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 fine cracks in the porcelain s glaze. Crazing translates to fine cracks in the glaze or surface layer of porcelain wares.

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