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Ferro Frit 3124

Leadless high calcium borosilicate frit

Alternate Names: F3124

OxideAnalysisFormula
CaO14.28%0.711
K2O0.68%0.020
Na2O6.40%0.289
Al2O310.01%0.274
B2O313.74%0.552
SiO254.94%2.555
Oxide Weight279.65
Formula Weight279.65
Enter the formula and formula weight directly into the Insight MDT dialog (since it records materials as formulas).
Enter the analysis into an Insight recipe and enter the LOI using Override Calculated LOI (in the Calc menu). It will calculate the formula.
COLE - Co-efficient of Linear Expansion 7.94
MLRG - Melting Range (C) 1600-1750F

This is a USA pottery frit. Ferro now calls it Frit 3124-2.

This borosilicate frit is high in calcium. It melts are very low temperatures and among the most useful of all common frits because of its glaze-like balanced chemistry. This frit has a chemistry somewhat similar to 3134 (the latter adds CaO, Na2O and B2O3 at the expense of all the Al2O3 and some SiO2.

Its stated intention is a calcium boron source for partially fritted glazes for wall tile and pottery, also in lead bisilicate dinnerware glazes in the cone 3-5 range. However, within pottery circles, like frit 3195 this frit is almost a complete glaze at low temperatures (requiring only a 10-20% addition of kaolin to suspend it). It has a medium thermal expansion and fits most bodies. However if glazes shiver some of this can be traded for Frit 3110. If they craze some can be substituted for Frit 3249. Frit 3124 is often added to glazes to make them melt lower, this works well because it is quite balanced already as a glaze, the net effect of adding it is to increase the boron content without overly disrupting the balance of other oxides.

Since the chemistry is high in CaO, it will affect browns and iron oxide colors.


Out Bound Links

In Bound Links


Pictures

These are 10 gram frit balls fired at 1700F. Each of them is a source of boron (B2O3), that is the magic of why they melt this low. Gerstley Borate is a raw source of boron, it has a very high LOI and is an undesireable source. But these frits have very specific uses. What are they? Frit 3124 and 3195 are base glazes, just add 15% kaolin and go. Frit 3110 raises thermal expansion (substitute some of it in if the glaze shivers). Frit 3249 lowers expansion (sub it in if the glaze crazes). Frit 3134? It is similar to 3124 but without any Al2O3, it is useful where you need more clay in the glaze (the clay can source the Al2O3 instead).

This chart compares the gassing behavior of 6 materials (5 of which are very common in ceramic glazes) as they are fired from 500-1700F. It is a reminder that some late gassers overlap early melters. The LOI (loss on ignition) of these materials can affect your glazes (e.g. bubbles, blisters, pinholes, crawling).

These two frits (Ferro 3124 left, 3134 right) have almost the same chemistry. But there is one difference: The one on the right has no Al2O3, the one on the left has 10%. Alumina plays an important role (as an oxide that builds the glass) in stiffening the melt, giving it body and lowering its thermal expansion, you can see that in the way these flow when melting at 1800F. The frit on the right is invaluable where the glaze needs clay to suspend it (because the clay can supply the Al2O3). The frit on the left is better when the glaze already has plenty of clay, so it supplies the Al2O3. Of course, you need to be able to do the chemistry to figure out how to substitute these for each other because it involves changing the silica and kaolin amounts in the recipe also.


By Tony Hansen

XML for Import into INSIGHT

<?xml version="1.0" encoding="UTF-8"?> <material name="Ferro Frit 3124" descrip="Leadless high calcium borosilicate frit" searchkey="F3124" loi="0.00" casnumber="65997-18-4"> <oxides> <oxide symbol="CaO" name="Calcium Oxide, Calcia" status="U" percent="14.280" tolerance=""/> <oxide symbol="K2O" name="Potassium Oxide" status="" percent="0.680" tolerance=""/> <oxide symbol="Na2O" name="Sodium Oxide, Soda" status="U" percent="6.400" tolerance=""/> <oxide symbol="Al2O3" name="Aluminum Oxide, Alumina" status="" percent="10.010" tolerance=""/> <oxide symbol="B2O3" name="Boric Oxide" status="" percent="13.740" tolerance=""/> <oxide symbol="SiO2" name="Silicon Dioxide, Silica" status="" percent="54.940" tolerance=""/> </oxides> </material>


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