****Revised early fall 2024 to improve glaze fit.  Bisque firing to Cone 01 is no longer necessary.  We owe these improvements to the important sharing of information from another clay manufacturer and friend.   ❤️   Our Revised Chalk Rock has been tested to fire beautifully with AMACO, Spectrum & Mayco low fire glazes Feel free to use their feedback from to share your experiences (click here)! 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.

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A low fire red clay with approximately 10% fine mesh silica sand and approximately 5% fine mesh grog 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) 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. 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. RECOMMENDED VIDEO: Red Clay Comparison by Bracker's

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White, Low Fire, Talc-Free Sculpture clay body. We developed this body as a replacement for our Earthenware White Plus. We also recommend this as an alternative to the Flint Hills Raku clay (when used for sculpture or handbuilding purposes). It contains both fine grog and sand, so it's ideal for handbuilding, but can be thrown also. It's just a tad off-white in color at 04. For best glaze results and a whiter color, bisque fire a bit hotter, to Cone 01. The body is still porous enough to accept low-fire glazes and the increase in bisque temperature will not be noticeable in energy costs or element life. 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.

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A non-talc based low-fire white clay that is easier to throw than talc-based bodies, especially for beginners. Fires to a creamy white at Cone 04. Low shrinkage and great glaze fit. 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) 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. 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. RECOMMENDED VIDEO: Terra Blanc by Bracker's

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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. Red Earthenware has been tested up to Cone 5/6 with good results, however, testing continues to be recommended as your results may vary.

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A low fire red clay with about 18% grog (30 mesh flint grog) 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. 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.

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Pyrometric cones measure heat-work (the effect of time and temperature). They are slender pyramids made from about 100 carefully controlled compositions. Each cone number is unique in measuring temperature within a small temperature range (less than 30°C). Cones measure the amount of heat absorbed over time. As the cone nears its maturing range, it softens and the tip begins to bend, drawn down by the influence of gravity.Standard, or Large cones are used as witness cones to monitor the firing and verify temperature uniformity. A cone pack is necessary to support the cones during firing. If you have a kiln sitter on your kiln, you should use Junior cones. Warning! Do not view cones above earthenware temperature with the naked eye as this may cause cataracts. View through welders goggles - sunglasses are not suitable as they filter out UV, but not the infra-red, which is the damaging wavelength in this case! [click on the image thumbnails below to open/download the PDF for each] Download SDS Sheet for Orton Cones

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Orton packages small cones in pairs to minimize breakage during shipping. This video shows how to Separate a pair of conjoined Small Orton Cones. Watch the PRODUCT VIDEO below to learn how to separate them. Pyrometric cones measure heat-work (the effect of time and temperature). They are slender pyramids made from about 100 carefully controlled compositions. Each cone number is unique in measuring temperature within a small temperature range (less than 30°C). Cones measure the amount of heat absorbed over time. As the cone nears its maturing range, it softens and the tip begins to bend, drawn down by the influence of gravity.Junior cones are designed to be used in a KilnSitter. Warning! Do not view cones above earthenware temperature with the naked eye as this may cause cataracts. View through welders goggles - sunglasses are not suitable as they filter out UV, but not the infra-red, which is the damaging wavelength in this case! [click on the image thumbnails below to open/download the PDF for each] Download SDS Sheet for Orton Cones

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$3.00 per box for delivery to the classroom for the Olathe School District.  Please add quantity equal to the number of clay boxes in your order  

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AMACO® Gloss Glazes fire to a smooth, glossy finish at a witness Cone 05. Always slow fire lead free glazes for best results. AMACO® Gloss Glazes flow slightly during firing to a high gloss finish, while correcting most application imperfections. Great for enhancing texture Vibrant colors Glossy surfaces ideal for utilitarian pottery Shown on White Clay Cone 05 LG-10 is our most popular Clear Glaze for studios!

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