What does 'unifying' a formula mean?

Unit 4 Topic 5
The Unity Formula

Unifying is the process of arithmetically manipulating the vaues for each oxide in the formula so that the flux oxides (for a glaze formula) or alumina oxide (for a clay formula) totals one.
.

If the MgO content of our example formula in column A is removed then effectively our glaze would have less flux in relation to the alumina and silica content. which would mean that our glaze would not melt as much if fired to the same temperature.

The formula in column C with it's higher Al2O3 and SiO2 values reflects this.

It has been created by finding the new total for the flux oxides without the MgO i.e. 0.8.

This value is then divided into all of the remaining values in the formula. e.g.

K2O .....0.2 divided by 0.8 = 0.25
Na2O... 0.1 divided by 0.8 = 0.125
CaO......0.5 divided by 0.8 = 0.625
Al2O3...0.4 divided by 0.8 = 0.500
SiO2.....2.6 divided by 0.8 = 3.25

A
B
C
K2O
Na2O
CaO
MgO
0.2
0.1
0.5
0.2
0.2
0.1
0.5
0.250
0.125
0.625
Flux
Al2O3
0.4
0.4
0.500
Stabiliser
SiO2
2.6
2.6
3.250
Glass-former

A the original formula
B the formula with MgO removed.
C formula in column B unified by dividing all values in the new formula by the flux total 0.8

The unity formula in column C would be the formula for the original recipe with the source materials for MgO removed.

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