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Using the Split Fill Function in Manual Mode
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Using the Split Fill Function in the Materials Selection Window

When filling an oxide in the Manual Make Recipe Mode you may sometimes want to share the input of a particular oxide between two or more materials. An example of this would be where the selection of say a feldspar to fill KNO would bring in too much Al2O3 and SiO2 - the glaze may be a low temperature glaze.

The Split Fill function allows you to share a fill between two materials. In the next example I have increased the level of KNO from 0.2 to 0.3 and lowered the Al2O3 and SiO2 mol parts in the Cone 10 Glaze formula to levels more appropriate for C.6.

Fig.6 showed what happened when I tried to fill the new KNO level with Australian Potash Feldspar.

Fig.6 An Overload Alert After Choosing Australian Potash Feldspar.

With the level of KNO at 0.3 the amount of Al2O3 and SiO2 brought in when the KNO was filled with Australian Potash Feldspar increased so much that the levels were too high for the formula requirements and an overload occured.

We could look for a Feldspar with less Al2O3 and SiO2 or we could use a high alkalai frit or a soluble materials such as Soda Ash.

Some of these options are not desireable so one strategy would be to share the KNO fill between a felspar and one of the less desirable materials.

We will try a combination of Australian Potash Feldspar and Ferro Frit 4110 and accept the samll amount of B2O3 that the Frro Frit will bring with it.


Click on the OK button in the Oxide Overload window to remove the Australian Potash Feldspar from the recipe so far.

Now click on the KNO button again to bring up the Materials Selection window.

Fig.7 Using the Split Fill function to partly fill the KNO with Australian Potash Feldspar.

At this point we will need to adopt a trial and error approach in order to find a balance of Australian Potash Feldspar and Ferro Frit 4110 which would allow us to still get some clay into the recipe (Al2O3 left to fill) and which uses the minimum amount ot frit (to keep the B2O3 and the cost down). Click on the Split % text box type in 40 then click the Use button.

Fig.8 Selecting Ferro Fritt 4110 to complete the fill for KNO

We want to try completing the KNO fill with Ferro Frit 4110 so we will leave 100 in the Split % text box, click on the Ferro Frit 4110 then click the Use button.

Fig.9 The frit creates an overload which we ignore.

As we expected using Ferro Fritt 4110 for the second material has produced an overload alert due to the B2O3 content of the frit.

The level is small so we will go with the overload and click the Ignore Overload button.

We could step back and reduce the frit content which would reduce the level of B2O3 but by accepting the B2O3 we can get a significant amount of clay in the recipe which will have its advantages in glaze application and handling.

Fig.10 The recipe creation is completed.

We now proceed to complete making the recipe which is shown in Fig.10.


Follow these links for more information about:


Formula to Recipe
Overview | Loading Recipe's from Disc | Entering a New Formula | Changing a Displayed Formula | Making a New Recipe from a Formula | Auto Mode | Preselect Mode | Manual Mode | Using the Split Fill Function Mode | Using the Graph in the Formula Management window