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These EBCT tests were fired at cone 04 and 05. The brown engobe layer is 2mm thick. These bars dried flat but curled during firing. They demonstrate that, although the body has no glass development, it is able to bend this much without cracking or breaking. Does that mean it has residual stresses within? Apparently not. I dropped these BiClay bars onto cement and they were very strong, bouncing and then breaking into one and three pieces (they would have shattered with high internal stresses present). Breaks that occurred were at right angles. When struck with a hammer angular breaks occurred, but the body-engobe join never failed on any shard. An actual engobe application would be far thinner than to ware made using it should be OK.
Tests |
Engobe Body Compatibility Test
A bi-clay test strip curls to demonstrate the drying and fired compatibility or fit of an engobe (or slip) on a ceramic body or of two bodies for marbling. |
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