Fusion Frit F621/19

Alternate Names: F 621/19

Oxide	Analysis	Formula
CaO	12.45%	0.66
Na2O	7.14%	0.34
Al2O3	9.90%	0.29
B2O3	14.90%	0.64
SiO2	55.61%	2.74
Oxide Weight		296.66
Formula Weight		296.66

Notes

Fusion recommends this as a better substitute for Ferro Frit 3124 than F-19 (Mar 2021). Yet this frit has a chemistry less similar to Ferro 3124 than F19.
This is the same as F-19 but with 2% less CaO. They do not release the chemistry of this so we just reduced the CaO and retotalled to 100.

Related Information

Ferro Frit 3124 vs Fusion F621/19 at cone 04

The Fusion one has less surface tension and is flowing a little more. And it has larger bubbles, so Fusion must be using a different set of raw materials to source the chemistry (materials that either have a higher LOI or decompose to produce gases later in the firing). They do not supply the chemistry of Frit F621/19 and it is not shown on their website in 2021. But they recommended it to us as a substitute candidate for Ferro Frit 3124.

Links

Materials	Ferro Frit 3124 A commonly available borosilicate frit is high in calcium.
Materials	Fusion Frit F-19
Typecodes	Frit 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.

By Tony Hansen
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