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EPK fired test bars, data, certificate and our data

All of the test bars have been fired in this project to characterize a shipment of EPK (from cone 7-10 and 10R bottom to top). The dry and fired lengths and the dry and fired weights testdata was measured and entered into our Insight-live account. The results are shown in the red-titled columns (the drying shrinkage, firing shrinkage, absorption). The weights from the sieve analysis are also shown. And the calculation of water content of the plastic material (a very high 33.4%) and LOI (14.5%). We also like to take and upload a photo of the oversize material from the sieve analyses (to compare with past shipments) and of their manufacturers certificate of analysis.

Notice the data that the manufacturer considers important to include on the certificate that they send with the shipment: Particle size, particle surface area and moisture content. Of course, they would not be able to do all the tests we do. But our product is affected by the properties of the material, so we have to test.

Results of EPK testing

Related Pictures

What makes EP Kaolin unique? Are others as good?


EPK kaolin slurry gels

In ceramics, EPK, or EP Kaolin, is used in clay bodies and glazes. Top right: Pure EPK is fairly plastic on wedging. But during the throwing process, it splits at the rim like this. The forming properties that it does have thus seem to be as much related to its stickiness and cohesion as plasticity. Without the help of bentonite or ball clay this would not be able to host the addition of feldspar and silica to make a usable porcelain or stoneware. But EPK shines in what it does as a slurry. Left: This slurry has been mixed to only 1.15 specific gravity and forms a thixotropic gel that clings to the spatula in an even layer. Bottom: This low specific gravity gel is thick enough that it will hold this heavy spatula vertical! Considering that our typical glazes have a specific gravity of 1.45 yet are still quite fluid it is evident just how much EPK can gel (and suspend a suspension). It is thus no surprise that it is the kaolin of choice in ceramic glazes. Are there other sticky kaolins that gel like this? Yes. Grolleg and New Zealand kaolin.

Links

Materials EP Kaolin
A kaolin that gels slurries (thus handy to suspend ceramic glazes). It is plastic and fires white enough that it is also valuable in porcelain bodies.
Projects Testing a New Load of EP Kaolin

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