Lily Krakowski on wed 23 oct 02
There are, I believe, some frits that are glazes in and of themselves. Is
this true, and if so can they be used as such, assuming they have bentonite
or somesuch added? If so would the resulting glaze be acceptable as a
functional pottery --tableware--glaze, assuming always that their maturing
temp is applicable to a high enough firing clay?
Also. I have long wondered and never found an answer in any book, if the
addition ONLY of alumina to a clay body would raise it from let us say c.04
to c.6.
In other words if one had a lowfire clay or body that one wanted to modify
for higher temp, could one just dry the body, add alumina, rehydrate, and
use it? I realize this would be pricey for a big batch, but let us say 25
lbs.
Lili Krakowski
P.O. Box #1
Constableville, N.Y.
(315) 942-5916/ 397-2389
Be of good courage....
John Hesselberth on thu 24 oct 02
Hi Lily,
There are several frits that would make so-so glazes at earthenware
temperatures. Ferro 3124, 3269, and 3195 might be worth trying. Would
they be suitable for functional ware--well maybe, but not great. With
little or no colorants in them they might not be too bad. I didn't look
at their expansion coefficients, but they would be quite different from
each other. You might get one of them to fit your clay. I doubt 2%
bentonite would keep them suspending though. You'd probably need a jack
hammer to get them off the bottom of the bucket if you let them sit for
a while.
Regards,
John
On Wednesday, October 23, 2002, at 06:35 PM, Lily Krakowski wrote:
> There are, I believe, some frits that are glazes in and of
> themselves. Is
> this true, and if so can they be used as such, assuming they have
> bentonite
> or somesuch added? If so would the resulting glaze be acceptable as a
> functional pottery --tableware--glaze, assuming always that their
> maturing
> temp is applicable to a high enough firing clay?
http://www.frogpondpottery.com
http://www.masteringglazes.com
Paul Lewing on fri 25 oct 02
on 10/24/02 5:26 PM, John Hesselberth at john@FROGPONDPOTTERY.COM wrote:
>> There are, I believe, some frits that are glazes in and of
>> themselves. Is
>> this true, and if so can they be used as such, assuming they have
>> bentonite
>> or somesuch added?
You don't say here what temperature you're working at. But I just got a
sample recently of Ferro frit 3292, and upon looking at the analysis, I
said, "Looks like a cone 5 glaze to me". Sure enough, with some clay added
to keep it in suspension it was lovely. I added EPK and 5% was enough to
suspend it. It got to be not so clear with 20% EPK added, but with 5-10% it
suspended beautifully, fit well and made a very clear hard glaze that
produced particularly bright colors from stains.
Paul Lewing, Seattle
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