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Stages of Clay

Stages of Clay. Wednesday 10/8/2014. Learning Goal. Students will be able to recall and identify the stages of clay. Physical Stages of Clay.

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Stages of Clay

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  1. Stages of Clay Wednesday 10/8/2014

  2. Learning Goal • Students will be able to recall and identify the stages of clay.

  3. Physical Stages of Clay • GREENWARE refers to unfired objects. Clay bodies at this stage are in their most plastic form. They are soft and malleable. Hence they can be easily deformed by handling.

  4. Wet Clay • In this stage clay can be easily manipulated and formed. Typically for methods of construction, pinch, coil, and slabs are all used in the Wet Clay stage. Clay is very malleable, with at least 805 moisture remaining.

  5. Physical Stages of Clay • LEATHER-HARD refers to a clay body that has been dried partially. At this stage the clay object has approximately 15% moisture content. Clay bodies at this stage are very firm and only slightly pliable. Trimming and handle attachment (putting pieces together) often occurs at the leather-hard state.

  6. Physical Stages of Clay • BONE-DRY refers to clay bodies when they reach a moisture content at or near 0%. You may not alter your piece once it gets to this phase. Your piece is ready to be bisque fired at this stage.

  7. Physical Stages of Clay • BISQUE refers to the clay after the object is shaped to the desired form and fired in the kiln for the first time, known as "biscuit fired". This firing changes the clay body in in several ways. Mineral components of the clay body will undergo chemical changes that will change the color of the clay.

  8. Physical Stages of Clay • GLAZE FIRING is the final stage of some pottery making. A glaze may be applied to the biscuit form and the object can be decorated in several ways. After this the object is "glaze fired", which causes the glaze material to melt, then adhere to the object. The glaze firing may also harden the body still more as chemical processes can continue to occur in the body.

  9. We fire our bone-dry pottery to become bisque in a Kiln. The temperature we fire to is 1945 degrees Fahrenheit. The Pyrometric Cone Equivalency (PCE) Is CONE 04.

  10. A KILN is a thermally insulated chamber, or oven, in which a controlled temperature regime is produced. Uses include the hardening, burning or drying of materials. Kilns are also used for the firing of materials, such as clay and other raw materials, to form ceramics

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