James L Bowen on fri 25 aug 00
The Sept/Oct 2000 issue of Clay Times on page=20
42 the following glaze attributed to Jack Troy.
Australian Shino (Cone 9-10)
Nepheline Syenite 55
Potash Feldspar 17
Ball Clay 14
Kaolin 14
Add salt +3
Bentonite +5
My question is about the efficacy of using salt as a glaze ingredient.
Will it damage an IFB kiln? =
=20
=
=20
Hank Murrow on sat 26 aug 00
James Bowen wrote:
>The Sept/Oct 2000 issue of Clay Times on page
>42 the following glaze attributed to Jack Troy.
>Australian Shino (Cone 9-10)
>Nepheline Syenite 55
>Potash Feldspar 17
>Ball Clay 14
>Kaolin 14
>Add salt +3
>Bentonite +5
>My question is about the efficacy of using salt as a glaze ingredient.
>Will it damage an IFB kiln?
>
dear James; The salt is a source of soluble flux, which will enhance the
carbon trapping ability of the glaze. Some use sodium carbonate for the
same reason. As the sodium begins to sinter in the glaze melt, it begins to
combine rapidly with the Al & Si and thus should not pose problems for your
kiln. The soluble material in your glaze will come to whatever surface
remains open during drying however, so you need to think about that to
avoid sticking to your shelves(tho 3% is not that much).
Hank in Eugene
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