Digitalfire Ceramic Glossary

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SiB:Al Ratio


This number is reported by INSIGHT software as part of the chemistry calculation of a batch recipe. It refers to the Silica:Boron combination campared to the amount of alumina. Since boron is also a glass former it needs to be considered in low and medium fire glazes. This ratio is not as clear an indicator of fired gloss as Si:Al because low fire glazes generally contain significant boron and thus operate by a 'different set of rules' than stoneware ones. For example, boron gloss glazes can take a lot more alumina into solution inthe melt than stoneware glazes even though alumina is very refractory. It is not typical to make a high alumina matte at low fire, generally mattes are made using high calcia or magnesia.

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