1-9 | A | B | C | D | E | F | Frits | G | H | I | J | K | L | M | N | O | P | Q | R | S | T | U | V | W | X | Y | Z

Fusion Frit FZ-16

Alternate Names: Fusion Frit FZ16

Oxide Analysis Formula
CaO 4.20% 0.18
Na2O 9.40% 0.36
ZnO 15.50% 0.46
B2O3 30.20% 1.04
SiO2 40.70% 1.62
Oxide Weight 239.87
Formula Weight 239.87


This analysis was confirmed with Fusion Dec 2017. They describe it as "used for textured glazes. Very high in boron and zinc.". But that description does not do this justice. No other frit we have ever used, even pure lead bisilicate, melts as well and to the brilliant surface that this does. This is an example of how much sense it makes to use a fritted form of a flux like zinc rather than the pure oxide material. Pure zinc oxide cannot produce the brilliant surface that this can. And it is fairly easy to do calculations (e.g. in your insight-live.com account) to substitute zinc in many existing boron fluxed recipes.

This is an example of a material that should be more commonly available than it is. There are equivalents from other manufacturers, but these likewise, are hard to get for small users. Volume users buy this by the pallet for their production, it's high cost amortizes down well considering the benefit it brings. A typical potter would be aghast at the price. Until he saw what this can do!

Related Information

Alberta Slip fluxed with frit 3195 vs. FZ-16

Two glazed tiles, showing Alberta Slip mixed 80:20 with two different frits

Fired at cone 6 using the C6DHSC schedule. On Plainsman M340 and Buffstone. Left: Alberta slip with 20% Ferro frit 3195 (GA6-B). Right: Alberta Slip with 20% Fusion Frit FZ-16 (G3903). This Fusion zinc frit is a super-melter, much better than 3195. A picture cannot do this glaze surface justice! The zinc brings out the red coloration much better. Frit FZ-16 is not readily available, we are hoping companies will eventually stock it. And it produces a more brilliant glassy surface that highlights thickness variations even better. Adding a little extra iron oxide (e.g. 1-2%) would make the effect even richer.

1700F Frit Melt-Off: Who is the winner?

Melted balls of 15 frits on a ceramic tile

These were 10g balls melted using our GBMF test. Frit 3602 is lead bisilicate. But it got "smoked" by the Fusion FZ-16 high-zinc, high-boron zero-alumina! Maybe you always thought lead was the best melter. That it produced the most transparent, crystal clear glass. But that is not what we see here. See something else? Each frit has a melt-fingerprint. Two are similar, it is immediately evident which.

Fusion Frit FZ-16-2 melt flow over many temperatures

This melt flow tester demonstrates the beautiful crystal-clear glass this zinc frit creates by 1700F. It fits this porcelain without crazing, even though very thick and high in sodium (the high zinc and boron are countering it to keep the thermal expansion down). It runs off the end of the runway around 1600F on this GLFL test, rivaling lead bisilicate. This is a more concentrated boron source than even Gerstley Borate. Everything about this material screams “ultra gloss”, what a material to build a fluid-melt reactive super-glaze on!


Materials Frit
Materials Hommel Frit 446
Materials Hommel Frit 840
Materials Pemco Frit P-1733
Materials General Frit GF-110
Materials Ferro Frit 3824
Typecodes Frit
Suppliers Fusion Ceramics Inc


Co-efficient of Linear Expansion7.90
Frit Softening Point1450F

By Tony Hansen

Copyright 2008, 2015, 2017 https://digitalfire.com, All Rights Reserved