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A porcelain mug warps under the weight of its own handle

An example of a cone 10 porcelain that is over mature. It contains too much feldspar and is vitrifying so much that it is beginning to melt. The weight of the handle is pulling the lip into a oval shape, even though the hourglass shape of the piece should offer stability. For translucent porcelains one must endure this issue, using more stable shapes or firing with support.

A porcelain mug warps under the weight of its own handle

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

Tests Pyroplastic Deformation
How to measure the tendency of a ceramic body to warp during firing.
Troubles Warping
There are multiple reasons why pottery and porcelain pieces can warp during firing, both vitreous and non-vitreous ware. Here is what to do about it.
Glossary Vitrification
The term vitrified refers to the fired state of a piece of porcelain or stoneware. Vitrified ware has been fired high enough to impart a practical level of strength and durability for the intended purpose.

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