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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 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 glass is also more transparent and the entrained bubbles are bigger. The differences could be partly to Fusion using a different set of raw materials to source the chemistry or differences in their smelting process.
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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