Si:Al Ratio
This number is reported by INSIGHT software as part of its calculation of the chemistry of a batch recipe. It singles out the silica and alumina oxide molecules and gives their relationship. For example, if there is 5.0 SiO2 and 0.5 Al2O3, then the ratio is 5.0:0.5 or 10:1, or just 10. This ratio is significant in stoneware glazes, for example, because high silica tends to produce glossy glazes when alumina is low and high alumina creates matte glazes when silica is low. It thus follows that the higher the Si:Al ratio the glossier a glaze will be.
However we must recognize that this ratio is not a general or fool-proof measure of gloss. Validity of the Si:Al ratio assumes a transparent glaze that is melting well and relatively free of other mechanisms that create matteness (e.g. high magnesia or calcia in low fire). Also remember that very low alumina glazes are fluid and encourage crystal formation during cooling; if these crystals are small they can completely cover the surface turning it matte. Out Bound Links
In Bound Links
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- Login to a private account or work with others in a group account (e.g. university).
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- Standard reports and mix ticket reports with last-minute-totalling; variations report as if they are a complete recipe.
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Imports many file formats
- Glaze recipe formats supported: HyperGlaze, GlazeGhem, GlazeMaster, Matrix, INSIGHT XML recipes (single and multiple), INSIGHT SQLite DB files.
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