How does a formula describing a glaze differ from one which describes a clay body?

Unit 4 Topic 6
The Unity Formula

In a glaze formula the convention is to manipulate the molecular parts values so the flux values total one (unity).

For clays the formula is manipulated so that the the value for Al2O3 equals one (unified).
.


Glaze Formula
K2O
Na2O
CaO
MgO
0.2
0.1
0.5
0.2
Flux = 1.00
Al2O3
0.4
Stabiliser
SiO2
2.6
Glass-former

 


Clay Formula
K2O
Na2O

MgO
0.04
0.03
0.02
Flux
Al2O3
Fe2O3
1.00
0.12
Stabiliser
SiO2
2.23
Glass-former


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