lgalbright@redrose.net on tue 31 aug 99
HELP!
I've been spending quite a bit of time experimenting (and filling boxes)
with glaze samples. I've found a nice semi-transparent, semi-gloss
Cone 10 glaze that works well with a number of colorants fired in oxidation.
I'd really like to keep the same qualities of the glaze, but reduce the
energy used and lengthen the life of my kiln by adjusting the glaze to
Cone 9, or 8.
Here's the mix:
40.6 Cornwall Stone
15.7 EPK China Clay
26.7 Silica
4.5 Dolomite
10.9 Whiting
1.5 Zinc Oxide
Any Advice?
Those who want to fire cone 10, enjoy the glaze...
Ron Roy on thu 2 sep 99
Piece of cake but I need to know if you are firing in oxidation or reduction.
Will you be using the same body - better test it to see if it is still
virtified at - will it be 8 or 9?
>----------------------------Original message----------------------------
>HELP!
>I've been spending quite a bit of time experimenting (and filling boxes)
>with glaze samples. I've found a nice semi-transparent, semi-gloss
>Cone 10 glaze that works well with a number of colorants fired in oxidation.
> I'd really like to keep the same qualities of the glaze, but reduce the
>energy used and lengthen the life of my kiln by adjusting the glaze to
>Cone 9, or 8.
>
>Here's the mix:
>
>40.6 Cornwall Stone
>15.7 EPK China Clay
>26.7 Silica
>4.5 Dolomite
>10.9 Whiting
>1.5 Zinc Oxide
>
>Any Advice?
>
>Those who want to fire cone 10, enjoy the glaze...
Ron Roy
93 Pegasus Trail
Scarborough
Ontario, Canada
M1G 3N8
Evenings 416-439-2621
Fax 416-438-7849
Mike Bailey on tue 7 sep 99
In message , lgalbright@redrose.net writes
An interesting question.
There seems to me to be several ways of doing this. Running the glaze
through David Hewitt's glaze calc program gives a % analysis of:
15.35 fluxes : 13.97 Al2O3 : 70.67 siO2
The direction you need to go in is to reduce the alumina by a small
amount and the silica by quite a bit - probably to about 66 or 67%.
Solution 1 would be to decrease the EPK to 8 parts and the Silica to 14
parts.
Solution 2 would be to increase the Dolomite to 6 parts and the Zinc to
5 parts.
Both have the effect of decreasing the alumina and silica in relation to
the fluxes.
Another test series could be to do a line blend between this glaze and a
known shiny transparent ^8 glaze - somewhere in between you'd find a
semi transparent!
Hope this helps, and I'll be interested to see the solutions that other
clayarters come up with,
Cheers,
Mike Bailey.
>----------------------------Original message----------------------------
>HELP!
>I've been spending quite a bit of time experimenting (and filling boxes)
>with glaze samples. I've found a nice semi-transparent, semi-gloss
>Cone 10 glaze that works well with a number of colorants fired in oxidation.
> I'd really like to keep the same qualities of the glaze, but reduce the
>energy used and lengthen the life of my kiln by adjusting the glaze to
>Cone 9, or 8.
>
>Here's the mix:
>
>40.6 Cornwall Stone
>15.7 EPK China Clay
>26.7 Silica
>4.5 Dolomite
>10.9 Whiting
>1.5 Zinc Oxide
>
>Any Advice?
>
>Those who want to fire cone 10, enjoy the glaze...
>
--
Mike Bailey
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