Oven Safety

For a ceramic food container to be oven safe, it should withstand being taken from a freezer and placed into a preheated oven. Since the temperature of a standard household freezer is 0°F , and baking temperatures are typically 375°F or less, a thermal shock test involving a rapid 400 degree temperature change would adequately demonstrate oven safety.  

A studio test was conducted in which 25 test cups (each glazed with one of the standard 25 studio glazes) were preheated to 500°F in an oven, and then immediately quenched in a room temperature water bath ( 70°F ) . Three cycles of heating and immersion were conducted.

None of the cups showed any sign of cracking or crazing. The test was repeated after one year had passed. After the second series of tests, there was still no sign of cracking or crazing in any of the samples.

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Test Samples : . . ..      Nearly identical test samples were made from a hollow tube of studio stoneware pressed through the Brent Extruder. The tube was cut up into short equal lengths, approximately 2.375 inches tall, with each piece then scored and joined to a flat slab base as illustrated below. This created a 90° (ie: worst-case) platelet misalignment at the extrusion-to-slab joint. The joint was then compressed with a wood tool along the inside and outside diameters, and excess clay cut away. All the samples are thus two-piece assemblies with the same height, diameter, wall thickness, base thickness, and joint attachment.

The samples were then bisqued and glazed along a vertical axis with one coat on the left, and two coats on the right. The final sample for Gloss White is pictured below:

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10 Responses to Oven Safety

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