|Monthly Tech-Tip |
Alternate Names: F12 Fusion,Frit F12
Description: Artware Flux Calcium Frit
As this cone 6 melt flow test demonstrates, the Fusion F-12 is giving very similar performance to the Ferro. The GR6-A recipe is just 80% Ravenscrag Slip and 20% frit (10% zircopax has also been added to opacify). The degree-of-melt on the glazed tiles in also very similar, however notice that some of the whiteness has been lost on the second F-12 tile (the first is frit 3134). We are attributing this to the better melting of F-12, that is amplifying the color of iron present in the Ravenscrag Slip. For the third tile we reduced the frit to 15%, that has whitened it somewhat. Likely an increase in the zircon and would whiten it more.
On paper, Fusion F-12 has a very similar chemistry to 3134. And in practice it also appears very similar, although a little more melt-fluid than the 3134.
G2926B is a popular recipe that saw alarm during 2021 because of the difficulty in getting Ferro frit 3134. This motivated us to get a supply of the Fusion equivalent, F-12. This is a demonstration of how effective a melt fluidity test can be in comparing two glazes. Not only does the test compare the degree of melt but also surface reaction to LOI (defects), iron content and melt surface tension.
Ferro Frit 3134
A frit with 23% B2O3. The most common of frits used in pottery in North America. Around the world, other companies make frits of equivalent chemistry.
Solargil Frit FR8
Hommel Frit 14
Frits are made by melting mixes of raw materials, quenching the melt in water, grinding the pebbles into a powder. Frits have chemistries raw materials cannot.
General Frit GF-111
Pemco Frit P-54
A frit is the powdered form a man-made glass. Frits are premelted, then ground to a glass. They have tightly controlled chemistries, they are available for glazes of all types.
|Co-efficient of Linear Expansion||8.18|
|Frit Softening Point||1450F|
|By Tony Hansen|
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