Lois Ruben Aronow on thu 10 feb 00
I just opened my kiln this morning and YIKES!! My bowls were bloated
beyond belief. AND my glaze was shivering, something that has never
happened to me before. I am assuming the two are related.
I used Kickwheel Pottery ^6 Grolleg. Bisqued to ^06. Fired to a nice
^6, not overfired at all. The glaze was a tried and true glossy black
I've been using for years, and not a new bucket, either.
I was previously using Standard Ceramics #365 ^6 Porcelain (which i have
gone back to). I have experienced a little bloating and quite a bit of
warping with it in the past, which led me to experiment with other ^6
grollegs.
I adore the look of the grolleg porcelain, and really enjoy the
challenge of throwing with it. But this was the worst bloating I have
ever experienced, and it was really scary. Is the bloating a fact of
life with ^6 grollegs? Or can it be corrected in some way? I have had
pretty good success with it in the 9 months I've been working with it.
Suggestions?
Veena Raghavan on fri 11 feb 00
Message text written by Ceramic Arts Discussion List
>I adore the look of the grolleg porcelain, and really enjoy the
challenge of throwing with it. But this was the worst bloating I have
ever experienced, and it was really scary. Is the bloating a fact of
life with ^6 grollegs? Or can it be corrected in some way? I have had
pretty good success with it in the 9 months I've been working with it.
<
Hi Lois,
Have you tried Highwater Clays P-5 mid-range porcelain. I do not
know the Grolleg content, but it is a great clay to throw, trim, and glaze.
All the glazes I have used come out very well on this clay. As I recall, it
was recommended by Amy Parker on Clayart. I am really happy with this
porcelain and have had no problems with bloating. I do not know where you
are located. I am in New York, and none of the suppliers here carry this
particular clay, so shipping was expensive. You may have a supplier near
you, who carries this clay, or you may be nearer the source in North
Carolina. Their e-mail is highwater@aol.com and their telephone is
828-252-6033. The person who helped me, and she was very helpful, was Freda
Mitchell. Hope this helps.
All the best and good luck with your search.
Veena Raghavan
75124.2520@compuserve.com
gambaru on sat 12 feb 00
I think you probably have two problems. Glaze fit and trapped carbon in
the clay. A bisque firing with a slower firing speed during the carbon burn
off period and if possible, venting the kiln and a higher bisque temp should
help cure the bloating problem. This is one of the few downsides to
grolleg. MB
----- Original Message -----
From: Lois Ruben Aronow
To:
Sent: Thursday, February 10, 2000 2:54 PM
Subject: cone 6 porcelain bloating
> ----------------------------Original message----------------------------
> I just opened my kiln this morning and YIKES!! My bowls were bloated
> beyond belief. AND my glaze was shivering, something that has never
> happened to me before. I am assuming the two are related.
>
> I used Kickwheel Pottery ^6 Grolleg. Bisqued to ^06. Fired to a nice
> ^6, not overfired at all. The glaze was a tried and true glossy black
> I've been using for years, and not a new bucket, either.
>
> I was previously using Standard Ceramics #365 ^6 Porcelain (which i have
> gone back to). I have experienced a little bloating and quite a bit of
> warping with it in the past, which led me to experiment with other ^6
> grollegs.
>
> I adore the look of the grolleg porcelain, and really enjoy the
> challenge of throwing with it. But this was the worst bloating I have
> ever experienced, and it was really scary. Is the bloating a fact of
> life with ^6 grollegs? Or can it be corrected in some way? I have had
> pretty good success with it in the 9 months I've been working with it.
>
> Suggestions?
>
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