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Example of how a frit softens over a wide temperature range
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TGA Analysis graph with overlaid mass spectrometry curve
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DFAC dried disk showing soluble salts and drying performance crack typical of a plastic pottery clay body.
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Drying disks used for the DFAC test to measure the drying performance of a clay
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Measuring SHAB clay test bars
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DFAC dried disk showing soluble salts and drying performance crack typical of a plastic pottery clay body.
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Fired test bars of a terra cotta clay showing varying levels of maturity or vitrification, DFAC disk showing solubles on an iron stoneware
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Solubles salts as visible on various DFAC test specimens
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Stacking of SHAB clay test bars for firing
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A stamp for marking identification on SHAB clay test bars
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Fired strength tester
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Dried bars ready to be measured.
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Example of a lab drier with heating elements, fan and temperature indicator
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Various different cone fired 10R clays with soluble salts on the surface
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Example of sedimentation test to compare soluble salts water extracts from suspended clay. This simple test also reveals ultimate particle size distribution differences in clays.
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Particle size distribution and root-of-two stack of sieves from 48-325 mesh
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Preparing a representative powder sample for sieve analysis
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Scale, calipers and fired test bars to be measured for shrinkage
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Fired test bars of a terra cotta clay showing varying levels of maturity or vitrification, DFAC disk showing solubles on an iron stoneware
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Fired strength tester
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Solubles salts as visible on various DFAC test specimens
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Flow tester used to compare feldspars
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G1215U vs. G1215W glaze flow test
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Flow tester comparing the melt fluidity of Albany Slip vs. Alberta Slip at cone 10R
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Example of sedimentation test to compare soluble salts water extracts from suspended clay. This simple test also reveals ultimate particle size distribution differences in clays.
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Albany Slip DFAC dried disk showing the soluble salts and characteristic cracking pattern and cut edge of a low plasticity clay.
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A DFAC drying test disk of a terra cotta pottery clay from St. Ignacio, Sinaloa, Mexico. The wideness of the main crack indicates high plasticity, edge cracks indicate tendency toward crack propagation.
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This 1000 ml 24 hour sedimentation test compares Plainsman A2 ball clay ground to 10 mesh (left) with one that same material ball milled (right). There is no sediment in the milled material.
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