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A batch of fired clay test bars in the Plainsman Clays lab
A batch of fired test bars that have just been boiled and weighed, from these we get dry shrinkage, fired shrinkage and porosity. Each pile is a different mix, fired to various temperatures. Test runs are on the left, production runs on the right. Each bar is stamped with a code number and specimen number (the different specimens are the different temperatures). The measurements have all been entered into our group account at insight-live.com. Now I have to lay out and photograph each pile and upload the picture into the code-numbered record. Upon doing so I compare color and tests results to make decisions on what to do next (documenting these in insight-live).
Links
| Articles |
Low Budget Testing of the Raw and Fired Properties of a Glaze
There is more to glazes than their visual character, they have other physical properties like hardness, thermal expansion, leachability, chemistry and they exhibit many defects. Here are some simple tests. |
|---|---|
| Articles |
The Physics of Clay Bodies
Learn to test your clay bodies and recording the results in an organized way and understanding the purpose of each test and how to relate its results to changes that need to be made in process and recipe. |
| Articles |
Ceramic Tile Clay Body Formulation
An overview of the technical challenges a technician in the tile industry faces in making good tiles from the least expensive materials and process possible. |
| Glossary |
Drying Shrinkage
Clays used in ceramics shrink when they dry because of particle packing that occurs as inter-particle water evaporates. Excessive or uneven shrinkage causes cracks. |
| Glossary |
Firing Shrinkage
During drying, clay particles draw together and shrinkage occurs. During firing the matrix densifies and shrinkage continues. More vitreous bodies shrink more. |
| Firing Schedules |
Plainsman Cone 6 Electric Standard
Used in the Plainsman lab to fire clay test bars in our small kilns |
| Tests | Shrinkage/Absorption Test |
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