Mole%
The Mole Percent (Mole%) calculation type has become popular because it provides room to rationalize oxide identity, interplay, concentration, and firing temperature. The Seger unity model does not work as well at lower temperatures. Some oxides that are powerful fluxes at high temperatures are refractory in low fire. Dynamic reassignment of oxides to the Seger groups by temperature is not practical at this time. Oxides have a much more individual presence than the Seger method tends to recognize. Their contributions to particular properties often are not linear according to concentration. Thus a more complex understanding of concentration vs. effect is needed. Oxide interplay producing characteristics attributable to the group is not recognized by the Seger system. Boron is both a glass and a flux and the logic for its employment at various temperature ranges differs. It does not 'plug into' a Seger formula very well. Mole% is simply a calculation of the percentage of oxide molecules by number (as opposed to an analysis which compares their weights). Following is an example of how to convert a raw formula to a Mole% formula.
Raw Percent
Oxides Formula Analysis
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K2O 0.6 / 12.1 x 100 = 5.0%
CaO 1.3 / 12.1 x 100 = 10.7
MgO 0.2 / 12.1 x 100 = 1.7
ZnO 0.1 / 12.1 x 100 = 0.8
Al2O3 0.9 / 12.1 x 100 = 7.4
SiO2 9.0 / 12.1 x 100 = 74.3
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Total 12.1 100.0
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Mole% ignores LOI as do formulas, it just looks at the oxides that makeup the fired glass. The INSIGHT Advisor dialog contains a few examples of target formulas from Richard Eppler and references are based on Mole%. These will give you a feel for how the system is used.Out Bound Links
In Bound Links
- (Glossary)
Analysis
An analysis (or percentage analysis) is typically ... - (Glossary)
LOI
Simplistically, LOI is the amount of weight a mate...
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