Entering a Material
Click on the button to open the Material List Window. Click on the Type Tab and then on 'New'.
Fill in the following:
|Name||= "China Clay (Ideal)"|
Click on the Analysis Tab. The default method of entry is Ultimate Analysis (The percentage of each
oxide entering fusion is used) but in this example you must change to Unity Formula by selecting 'Unity' from the
pull down list. Now enter the following formula for Kaolinite:-
All recipe analyses are based on the composition of materials when they enter fusion. To calculate this, subtract the percentage Loss on Ignition (in this case 13%) from the unfired weight of 100%. Any recipes using this material will be calculated on 87% of the weight of Kaolinite entering the glaze fusion.
To save the material to the current database click on the Type Tab again and then on 'Add'. If the material already exists in the current database, you will be asked if you wish to save any changes. By selecting 'Yes', you will overwrite the old data.
Note: The above example is not a true Unity formula because there are no basic oxides in the material. Instead the analysis is calculated on the ratio of Silica to Alumina.