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This super-vitrified clay bodies does this when fired

Although not clearly visible in this photo, the unglazed body surface on both of these MNP (Plainsman 3D + 10% feldspar) pieces has a sheen - because they are super-vitreous. And broken surfaces appear like glass (as can be seen in the broken chips on the right). Because the foot-ring of the piece on the right is too angular it is plucking all the way around. This is not happening on the piece on the left for two reasons: The angle was rounded and it was fired on silica sand. Because it is so fine-grained (wet screen to 325 mesh) and contaminant-free the body tolerates firing well past the point of vitrification - not only resisting bloating and warping but giving something else: Incredible fired strength.

A super vitreous clay body

Related Pictures

Why the base of this bowl shape flattens on firing


The problem is a combination of the shape and the degree of vitrification this body reaches. Polar Ice porcelain has to vitrify enough to achieve translucency, that means it literally softens - not enough to fall down but enough to warp out of shape given the opportunity. A sagging kiln shelf, for example, will produce a "rocking chair bowl". A non-stable shape will do the same thing. This piece was likely made by rolling a plastic clay slab and draping it down over a bowl-form, adding a foot ring, allowing it to stiffen and then uprighting it to dry. In this case the foot ring was too small creating an extreme overhang. Had the foot ring been wider and deeper it would have enabled the rounded inside contour, provided support for the outer section and minimized the overhang. If a small foot is really needed then pieces would have to be supported by donut-shaped setters sized and positioned correctly (and the outside would have to be unglazed). Or, it would have to be bisque fired, and supported, at cone 6 and then glazed at low temperature.

Links

Glossary Plucking
A firing issue in ceramics where the foot rings of vitreous ware stick to the kiln shelf. Removing them leaves sharp fragments glued to the shelf.
Glossary Restaurant Ware
If you are a potter and want to make restaurant ware, read this. Many of the things you already think you know will mislead you in this type of venture.
Projects Plainsman 3D, Mother Nature's Porcelain/Stoneware

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