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Unit 7 Topic 9
Using Unity Formulae
What unity formula factors indicate that a stoneware glaze may have clear glaze qualities after firing?
Clear glazes will have the Al : Si ratio around 1 : 9 and will have low levels of very active fluxes such as Li2O and CaO.

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A clear stoneware glaze is only possible if there are low levels of Al2O3 and SiO2 in the glaze.
A clear stoneware glaze is possible if formula oxide values are within the limit range for the firing temperature and the Al : Si ratio is around 1 : 9.
The unity formula alone cannot indicate the likelihood of a clear glaze resulting from the firing.
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