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Historical data on drying and firing casting slip performance

Suddenly ware is coming out of your production kiln warped or cracked or off color. Unless the answer is obvious the first action should be to compare its drying and firing test data with past runs. If you are doing that as a routine then SHAB test bars (and the test result data they bring) will already be available for any finished ware that comes out of the kiln. That data is a characterization of your clay body. It is not possible to put a value on this kind of data gathering until a disaster happens (or better yet is prevented). Clay bodies have plasticity, dry performance, dry strength, fired density, fired shrinkage, fired strength, etc. If you have historical data (accompanied by firing schedules, recipes, etc) you have an invaluable tool. Where does one gather the data? In spreadsheets? No, in a database. And account at Insight-live.com is specifically intended for this.

SHAB test bars for casting

Related Pictures

Length marker for SHAB bars


This was 3D printed. It is a testament to how precise 3D printers can be, the markers are almost exactly 10cm apart (outside edges).

3D design, printing and use of a slip clay test bar mold


SHAB mold for casting clays

This is for making test bars of slip casting clays bodies for use in the SHAB test (to measure drying shrinkage, firing shrinkage and fired porosity). I designed it in Fusion 360 and 3D printed the light-duty rails and case mold. I poured plaster into that to make the two plaster working mold halves (top right). The funnels provide a reservoir so the bars be cast solid. This mold can produce a set of three bars in less than an hour.

Links

Tests Shrinkage/Absorption Test
SHAB Shrinkage and absorption test procedure for plastic clay bodies and materials
Glossary Characterization
In ceramics, this normally refers to the process of doing physical or chemical testing on a raw material to accurately describe it in terms of similar ones.
Glossary Physical Testing
In ceramics, glazes, engobes and bodies have chemistries and physics. To fix, formulate and adjust their relative importances in each situation need to be understood.

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