What information is provided by raw material suppliers?

Unit 4 Topic 12
The Unity Formula

Raw material suppliers provide a chemical analysis listing the oxide content of a material in percentage terms.
.


The % analysis is not a unity formula.

The percentage analysis lists the oxides which would end up in a glaze when the material is fired.

The oxide values in the analysis are expressed as percentages by weight.

When a material is entered into a glaze software material database the percentage analysis is usually converted into a unity formula ready for use in unity formula calculations.

 


%
Analysis
Unity Formula

K2O
Na2O
CaO
MgO

3.81%
4.00%
2.06%
0.09%
0.7240
0.2552
0.0208
0.0115
Al2O3
Fe2O3

14.93%
0.13%

1.0180
SiO2
72.90%
8.4281
The data in the chart shows the % analysis by weight and the equivalent unity formua for a typical feldspar.
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