Kat in the Hat on tue 1 jun 04
Hi Ron and all:
I was wondering do you use a guide-line or limit's for silica
and alumina ratio in low, med. and high temperature firing glazes.
What would they be?
I know that there is exceptions to the rules, (ie. high alumina
matte's) -- specifically I am thinking glossy glazes. I noticed
info. for the medium range, but it is not clear to me on the low
and high temperature range. What is your opinion on that?
Kat
kat@digitalfire.com
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Ron Roy on wed 2 jun 04
Hi Kat,
I use two sets of limits - the one included in Insight and the set in David
Greens "Understanding Pottery Glazes for glazes with boron in them - same
set is in Cooper and Royals "Glazes for the potter."
They are only a starting point really - after a while you start making your
own to suit yourself.
Then there are the set that came out of our research on stable glazes.
From the Insight Manual - B2O3 not included in flux unity.
From Green and from Cooper - B2O3 included
I tried to paste them in but it's a mess,
Send me a fax # and I'll send them.
The whole Seger system breaks down for low fire because the alkaline earths
are not fluxes down there. It helps if - in your software - you can take
them out of unity.
That is why Eppler says he prefers the mole % method.
RR
>I was wondering do you use a guide-line or limit's for silica
>and alumina ratio in low, med. and high temperature firing glazes.
>What would they be?
>
>I know that there is exceptions to the rules, (ie. high alumina
>matte's) -- specifically I am thinking glossy glazes. I noticed
>info. for the medium range, but it is not clear to me on the low
>and high temperature range. What is your opinion on that?
>
>Kat
>kat@digitalfire.com
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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