PLEASE NOTE SPRING 2021 BRACKER’S IS NOW SELLING CLAY BY THE BOX, NOT BY THE POUND, PLEASE SELECT NUMBER OF 50# BOXES YOU WANT
A low fire red clay that fires to a light red-orange color at cone 06 to 05, and a richer, deeper red color when fired hotter, up to about a cone 2.
During the summer of 2020, we completed a comprehensive test of our clay bodies. For each clay body, we tested 6 flat bars, which were rolled out on a slabroller. We ALSO tested vertical shrinkage of a thrown cylinder (6 sections, each with their own test)
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- beginning weights in grams were recorded
- the lines and weights were measured & recorded when bone dry
- The samples were fired to Cone 04
- lines and weights were measured & recorded again
- The flat tiles were then soaked in hot water for 1 1/2 hours, then weighed again
- Math magic was then done to calculate the average shrinkage wet-dry and average shrinkage overall for both flat and thrown tests, and the average water absorption was calculated based on the flat bars.
- We also figured the "LOI" (Loss on Ignition) by computing the fired weight against the bone dry weight. This tells us what percent of organics burn off in the firing.
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Flint Hills clays have been evaluated by a nationally certified toxicologist, and have been found to be in compliance with ASTM C-1023 and D-4236, and to not contain any material in sufficient quantity to be toxic or to constitute a chronic health hazard when used responsibly.