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URL: How to fix the 50:30:20 Gerstley Borate cone 6 base recipe
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https://insight-live.com/insight/share.php?z=HzyNzj9ELs
This pottery glaze recipe is a fluid melt transparent. Many recipes are built on it by adding colorants, variegators and opacifiers. But frits can source the boron instead, producing a better base for the same additives.
Related Information
Gerstley Borate 50:30:20 glaze. How could this have worked?
This recipe, G2826A, a base transparent recipe having 50% Gerstley Borate plus 20% kaolin, is "jelly city". Even with 2.5g of Darvan deflocculant in this jar it is still thick enough to require pushing this tile down into it! Even then, it needs 5 seconds to build up enough thickness. And then does not even cover properly. People have suffered with this popular fluid-melt recipe for 50 years or more just to get the surface variegation it produces. They add all manner of colorants and opacifiers to it. And endure its incessant running onto kiln shelves, bubbling and clouding. It is time to just stop this "Dr. Jekyll and Mr. Hyde" of ceramic materials! And use different base transparents that employ frits to source the boron (B2O3). Same chemistry, just a better recipe: G2826A1. Then just add rutile or titanium to restore the variegation. Are you a masochist and still want to be punished? Then at least use the G2826A2 recipe with Gillespie Borate instead.
Links
| Materials |
Gerstley Borate
Gerstley Borate was a natural source of boron for ceramic glazes. It was plastic and melted clear at 1750F. Now we need to replace it. How? |
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| Typecodes |
Gerstley Borate Glaze Calculation examples
Examples of how we use glaze calculations (in an Insight-Live.com account) to replace Gerstley Borate with other materials, especially frits, in various glaze recipes. In doing so we take the opportunity to improve the recipe in other ways (e.g. reduce thermal expansion, improve slurry properties, reduce bubbling and crawling). |
| URLs |
https://insight-live.com/insight/share.php?z=Ybg8bJbZsf
The wrong and right way to substitute Gerstley Borate in the 50:30:20 recipe |
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