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Low Fire Frit 3195 Glossy Transparent

Code: G1916Q
Modification Date: 2017-01-29 23:07:05

An expansion-adjustable cone 04-02 transparent glaze made using three common Ferro frits (low and high expansion) and a suspension strategy that produces an easy-to-use slurry.

MaterialAmount
Ferro Frit 319565.0
Ferro Frit 311020.0
Ferro Frit 32490.0
No. 5 Ball Clay15.0
 100.00  

Notes

This recipe contains a very high percentage of frit and thus has the potential to produce a super-transparent surface of high quality. It also has good application properties (if mixed properly, see below) and melts to a clear at cone 04-02. The high frit content also means it will fire to an equally good surface at all three cones. Although the glaze will melt also at cone 06 its bond with the body is poor at that low a temperature, it is much better to fire higher (cone 04 or 03). Additionally, this recipe is thermal-expansion-adjustable (using the method described below).

Frit 3195 is actually a complete glaze on its own (although fires slightly silky rather than completely glossy). But it is middle-of-the-road for thermal expansion (an 85:15 frit:clay mix will shiver on some bodies and craze on others). We initially experienced shivering on our native clay talc bodies. Thus another frit was incorporated (actually, this recipe has two other frits, we will see why in a moment):

High-expansion, super-glossy Ferro Frit 3110. By incorporating some of this (in place of the 3195) we get a glaze of higher thermal expansion (and better gloss). We tried Frit 3110:3195 ratios of 20:65 (this recipe) and 40:65 (G1916R). This eliminated the shivering we had. Of course, using too much Frit 3110 would induce crazing on a non-talc body, the opposite problem.

Super-low-expansion, glossy Ferro Frit 3249. Although the amount is zero in this recipe, we have included it to show it as an option. If crazing is serious use this instead of Frit 3110. We found that 65:20 mix of 3195:3249 (G1916T) works on Plainsman Buffstone, for example.

This frit-juggling strategy affords a wide range of adjustment for tuning the fit to a body. We suggest stress-testing the fit of the glaze recipe you decide on by subjecting a piece of thin-walled ware to boiling-water-into-ice-water (and vice versa) immersion. This will reveal misfit that will happen with time.

Again, it is intended that you adjust the proportion of the frits (against each other) to react to any shivering or crazing that might occur with your clay body. For crazing, balance the Frit 3195 percentage with Frit 3249; in the event of crazing, do it with Frit 3110).

We have had some issues with clouding when it is applied thicker. Of course, the goal with a transparent glaze is to produce a crystal clear (without micro-bubble clouds). Low fire glazes are generally applied thinner than with stoneware, especially on white burning clays. To achieve this, try bisquing your ware higher (to get a less absorbent surface). Or try tuning the glaze viscosity and specific gravity to be able to apply it thinner and evenly. A very good way to do this is to gel the slurry a little (by flocculating it; see the thixotropy link below for more info).

If you do not mix this with the amount of water needed to make a creamy slurry it will apply too thick, too thin or unevenly.
This recipe employs ball clay, feel free to substitute a kaolin (we have used EPK). The 15% clay is plenty to suspend the slurry (added bentonite is not needed). The best slurries for pottery are gelled slightly so they hang on in a even layer without dripping. Achieving this is a matter of specific gravity and the addition of a small amount of vinegar or epsom salts (see the thixotropy link below).

Out Bound Links

In Bound Links

XML to Paste Into Insight

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By Tony Hansen




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