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12 Cards in this Set
- Front
- Back
- 3rd side (hint)
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Refractory |
Refers to the amount of heat it takes to return clay to it's rock like form and/or slump or melt it |
"resistance to heat" |
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Vitrification |
The tightening of or reduction of space between particles resulting in a lack of materials ability to absorb water. |
To return to a glass or rock like form through heat or some other chemical process |
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Plasticity |
The property of clay that allows it to change shape without rupturing when force is applied to it. |
Subjective in measurement, cannot be scientifically proven |
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Workability |
The character of a clay that is a combination of plasticity and wet strength |
The addition of grog or sand may permit a plastic clay to stand up taller without slumping, this making it more workable |
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Short |
Clays and clay bodies lacking plasticity. |
A clay bent or coiled that cracks may be short |
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Grog |
A clay additive made from fired clay that has been ground down into a powder |
Can add texture and strength, prevents warming and cracking. Jagged particles. |
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Silica sand |
An lay additive that does all the same things as grog but is actually small, round particles of sand rather than jagged particles of fired clay. |
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Impurities |
Other substances that affect the quality PR characteristics of clay |
Bugs, iron oxide, titanium, etc. |
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Slip |
A watered down form of clay used to join two pieces together so that they stay in suspension |
"Flocculant"; a chemically induced treatment to clay that helps keep a decorative slip or glaze from settling out. |
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Terra Sigillata |
A form of decorative slip. The finest particles of clay are separated out from the rest of the slip |
Use mainly on low fire or earthenware. The results is a smooth surface of a pot almost like a glaze |
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Pyrometric Cone |
A triangular piece of clay designed to melt at a specific temperature. The most accurate way to measure the temperature in a kiln. |
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The Four Components of a clay Formula/Recipe |
Clay-Kaolin Flux- Fieldspars Fillers-sand, grog, nylon fibers, paper pulp, chards of metal, organic materials, pasta, rice, colorants or stains |
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