Carol Seidman on tue 15 jun 99
Dear Friends: I just received a materials list for an upcoming workshop
at Peters Valley Crafts Center in New Jersey. We are to bring bisque
pots for a ^10 gas firing. Only the pots made on site the first day
will be dry enough to bisque and include in the gas firing, so we have
been invited to bring extra bisque to fill the kiln. Now my
question: The choices of clay from my supplier show a maximum firing
temp of ^10. These are clays from Standard Ceramic Supply. Is there
anyway I can be sure of good pots with this clay if the firing goes a
little hotter?. Would throwing thick or adding grog help? I have just
enough time to get the clay, make the pots and go. I'd appreciate any
recommendations on clay choice as well. Many thanks. Carol Seidman
Barbara Lewis on wed 16 jun 99
Carol: I fire ^10 clays and many times have brought the kiln to ^11. I
don't think you'll have any trouble with clays rated for ^10. I definitely
would not change anything you're doing like adding more grog or throwing
thicker. You probably wouldn't be happy with the results. I have good
results with Standard 259 which has a wide firing range. Have fun at the
workshop. Barbara
At 08:19 AM 6/15/99 EDT, you wrote:
>----------------------------Original message----------------------------
>Dear Friends: I just received a materials list for an upcoming workshop
>at Peters Valley Crafts Center in New Jersey. We are to bring bisque
>pots for a ^10 gas firing. Only the pots made on site the first day
>will be dry enough to bisque and include in the gas firing, so we have
>been invited to bring extra bisque to fill the kiln. Now my
>question: The choices of clay from my supplier show a maximum firing
>temp of ^10. These are clays from Standard Ceramic Supply. Is there
>anyway I can be sure of good pots with this clay if the firing goes a
>little hotter?. Would throwing thick or adding grog help? I have just
>enough time to get the clay, make the pots and go. I'd appreciate any
>recommendations on clay choice as well. Many thanks. Carol Seidman
>
Wellspring Clayworks
5412 Well Spring Road
La Plata, MD 20646
blewis@crosslink.net
(301) 932-3915
P. Cox on wed 16 jun 99
I've had good luck with Standard Brand #153. It throws well and seems
to hold up well in the firing.
pcox
Mary Ernst on thu 17 jun 99
Hi Carol -
The clays we purchase thru Highwater Clay have a broad firing range
and even though they are listed as mid-fire clay bodies (cone 4-6) , we
have had no difficulty taking them up to a "hot" cone 10 in reduction
firing in the occasional firing we do at our instructor Susan Filley's
studio. My guess is that you would be O.K. with your stoneware clay. I
would be more cautious with porcelain although I know that in the past
Susan has also fired a cone 7 porcelain to cone 10 without difficulty.
We had this very discussion earlier today. Good luck.
Mary in Charleston
Lori Pierce on fri 18 jun 99
Mary, have you ever used any Highwater clay body that you would recommend
for cone 6 fountains? Those made of cone 6 Standard clays at the local craft
center are still seeping water through the base. They are all glazed with
various commercial cone 6 glazes. One made of Highwater Helios Porcelain
and fired to cone 6 did NOT leak even tho the specified firing range was
higher, 7-10, I think. I do not have a Highwater catalogue. Highwater
clays seem to have a very fine reputation. Thanks Mary et all for your help.
This is a nagging problem for the "girls". Lori in New Port Richey, Fl.
where it is wet at last and VERY sticky.
-----Original Message-----
From: Mary Ernst
To: CLAYART@LSV.UKY.EDU
Date: Thursday, June 17, 1999 5:27 PM
Subject: High Fire Clay Question
>----------------------------Original message----------------------------
>Hi Carol -
> The clays we purchase thru Highwater Clay have a broad firing range
>and even though they are listed as mid-fire clay bodies (cone 4-6) , we
>have had no difficulty taking them up to a "hot" cone 10 in reduction
>firing in the occasional firing we do at our instructor Susan Filley's
>studio. My guess is that you would be O.K. with your stoneware clay. I
>would be more cautious with porcelain although I know that in the past
>Susan has also fired a cone 7 porcelain to cone 10 without difficulty.
>We had this very discussion earlier today. Good luck.
>
>Mary in Charleston
>
CNW on sat 19 jun 99
Riverside Grit.
Also check with them. Brian or Mary Kay will be glad to help and they have
done tests on absorbency, etc.
Riverside is what Kathy Triplett uses for outdoor work.
But beware of making things that can trap ice as it expands, things should
either let water run off or be wider at the top than the bottom so the ice
has room to expand.
Celia in NC
cwike@conninc.com
Ron Roy on sun 20 jun 99
Using a cone 6 clay at cone 10 seems scary to me. Now if the clay is
underfired at cone 6 then perhaps - but I would recommend doing some test
bars to determine the absorbency and shrinkage at both cones before putting
your egges in that basket.
RR
>----------------------------Original message----------------------------
> The clays we purchase thru Highwater Clay have a broad firing range
>and even though they are listed as mid-fire clay bodies (cone 4-6) , we
>have had no difficulty taking them up to a "hot" cone 10 in reduction
>firing in the occasional firing we do at our instructor Susan Filley's
>studio. My guess is that you would be O.K. with your stoneware clay. I
>would be more cautious with porcelain although I know that in the past
>Susan has also fired a cone 7 porcelain to cone 10 without difficulty.
>We had this very discussion earlier today. Good luck.
Ron Roy
93 Pegasus Trail
Scarborough, Ontario
Canada M1G 3N8
Tel: 416-439-2621
Fax: 416-438-7849
Web page: http://digitalfire.com/education/people/ronroy.htm
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