Snail Scott on sat 5 oct 02
At 02:50 PM 10/5/02 -0500, you wrote:
>...Is there some intrinsic reason that I don't
>understand that I should not fire a low fire body to cone 6?
I figure, if it fires well at ^6, then by
definition it's not really a low-fire body
anyway. Do it if it works for you. I'd be
more concerned about underfiring a ^6 body.
-Snail
Reno, NV
Wanda Holmes on sat 5 oct 02
I am trying to 'land' on a claybody that can become my standard. I'm
working at cone 6 now (though I occasionally flirt with cone 01 because
I can get good, vitrified results from my local red earthenware body at
that temp). I've tried a variety of white bodies at cone 6 but all are
more porous than I'd like (3.5 - 5.5%). I recently tested a local low
fire white body at cone 6. It shows no sign of overfiring and the
porosity is 2.5%. My next step is to try it with some of my cone 6
glazes. Before I go any further down this path, is there any caution I
should be aware of? Is there some intrinsic reason that I don't
understand that I should not fire a low fire body to cone 6?
Thanks,
Wanda
Ron Roy on mon 7 oct 02
One caution - well two actually - keep a close eye on the absorbency from
batch to batch - some of those low fired bodies are loaded with Talc and
Tack is a VERY active flux from about cone 4 to cone 8 - it then settles
down and acts like the other mid temperature fluxes.
The other part to watch is the COE - those high Talc bodies can have a very
high expansion/contraction rate so any glazes with a low expansion can be
prone to shivering and/or glaze dunting.
Best thing would be to use our glazes in Mastering glazes to find out if
the clay expansion is high - if that is so I can tell you which glazes
might be problematic.
RR
>I am trying to 'land' on a claybody that can become my standard. I'm
>working at cone 6 now (though I occasionally flirt with cone 01 because
>I can get good, vitrified results from my local red earthenware body at
>that temp). I've tried a variety of white bodies at cone 6 but all are
>more porous than I'd like (3.5 - 5.5%). I recently tested a local low
>fire white body at cone 6. It shows no sign of overfiring and the
>porosity is 2.5%. My next step is to try it with some of my cone 6
>glazes. Before I go any further down this path, is there any caution I
>should be aware of? Is there some intrinsic reason that I don't
>understand that I should not fire a low fire body to cone 6?
>
>Thanks,
>Wanda
Ron Roy
RR#4
15084 Little Lake Road
Brighton, Ontario
Canada
K0K 1H0
Phone: 613-475-9544
Fax: 613-475-3513
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