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Fusion Frit F-19

Alternate Names: Fusion Frit F19

Description: Boro Calcium Dinnerware Frit

Oxide Analysis Formula
CaO 14.20% 0.69
Na2O 7.00% 0.31
B2O3 14.60% 0.57
Al2O3 9.70% 0.26
SiO2 54.50% 2.48
Oxide Weight 273.21
Formula Weight 273.21


This frit has a chemistry very similar to Ferro 3124 yet Fusion recommends their Frit 621/19 as closer substitute.

Related Information

G2934 using Fusion Frit F-19 instead of Ferro 3124

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Melt fluidity tester comparing two versions of G2934

G2934B is a popular recipe and there has been alarm recently because of the difficulty in getting the Ferro frit and variation in its quality recently. This motivated us to get a supply of the Fusion equivalent, F-19. When doing substitutions like this we do testing in glazes and with melt fluidity tests like this .

Ferro Frit 3124 vs Fusion F-19 at cone 04

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Melt flow test of Frit 3124 vs F-19

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.

Arbuckle Majolica glaze using Fusion Frit F-19

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Majolica glaze tiles

Fusion Frit F-19 is claimed to be a substitute for Ferro Frit 3124. The glaze was applied on Plainsman L210 and fired at cone 04 (not as thick as would be customary on Majolica ware). Left is with Ferro Frit 3124, right is with the Fusion product.


Materials Ferro Frit 3124
A commonly available borosilicate frit is high in calcium.
Materials Fusion Frit F621/19
Materials Frit
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.
Materials General Frit GF-113
Materials Hommel Frit 90
Materials Hommel Frit 378A
Materials Pemco Frit P-311
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.


Co-efficient of Linear Expansion 7.90
Frit Softening Point 1550F
By Tony Hansen
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