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Fusion Frit F621/19 is recommended as a substitute candidate for Ferro Frit 3124. However, as shown on this melt fluidity test of the two pure frit powders, it appears to have a lower surface tension and flow better. However the character of the flow is opposite to what is expected of a lower surface tension in the melt. There should either be a lower population of micro-bubbles or they should be smaller - but the opposite is the case. There should be fewer breaking at the surface and they should be healing better - but that is not the case. Frits are supposed to be free of carbon or hydrates - or are they? If the frit is sourcing gases because of raw materials not fully decomposing during smelting - how is that even possible? Do you know why this is happening, can you tell me please? Fusion Ceramics does not supply the chemistry of Frit F621/19 and it is not shown on their website in 2021, but I have no reason to believe it contains fluorine.
On paper, Fusion Frit F-19 has a very similar chemistry to 3124. However, as can be seen here, it is flowing a little more and appears to have a lower surface tension. The entrained bubbles are bigger so the glass is more transparent. This brings up some of the same puzzling questions as did our tests on their Fusion Frit F621/19.
Materials |
Fusion Frit F621/19
A commonly available calcium borosilicate frit having a similar chemistry to Ferro Frit 3124. |
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Materials |
Ferro Frit 3124
A commonly available calcium borosilicate frit. |
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