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Fired at 1850F. Frit F-524 has run off the tester since 1850F. Frit 3602 is lead bisilicate.
Low-fire glazes must be able to pass the bubbles they and the underlying bodies generate (or clouds of micro-bubbles will turn them white). This cone 04 flow tester makes it evident that 3825B has a higher melt fluidity (A has not even dripped onto the tile). And its higher surface tension is demonstrated by how the flow meets the runway at a perpendicular angle (it is also full of entrained micro-bubbles). Notice that A, by contrast, meanders down the runway, a broad, flat and relatively clear river. Low-fire glazes, for example, must pass many more bubbles than their high-temperature counterparts, the low surface tension of A aids that. A is Amaco LG-10. B is Crysanthos SG213 (Spectrum 700 behaves similarly, although flowing less). These two represent very different chemistry approaches to making a clear glaze. Which is better? Both have advantages and disadvantages - this property has implications, just not for bubble clouding, but on other issues involving glaze performance and even defects.
Materials |
Ferro Frit 3602
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Materials |
Fusion Frit F-524
A low fire base glaze, add 10% kaolin, adjust thermal expansion using other frits. |
Glossary |
Surface Tension
In ceramics, surface tension is discussed in two contexts: The glaze melt and the glaze suspension. In both, the quality of the glaze surface is impacted. |
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