Dale Cochoy on fri 21 dec 01
I read most of the bloating thread mails over the last week or so. I have
this problem often with one particular clay, Standard #266. Never with the
Miller, Laguna or Ohio Ceramics clays I've used. I didn't respond to any
mails because I was sifting through info.
This morning I opened the kiln to find a rather large thrown pot with two
large bloats in it. Standard 266 clay.
I finally decided to call Standard. When I got the rep on the phone, I said
" I'm having trouble with bloating with one of your clays", and she said "
#266". I took this as a sign that I was not alone. According to her it is
all a problem of impurities not getting burned out during bisque between
800 to 1,500 degrees. Note: they never bloat during the bisque firing, just
during high fire to cone 5 1/2-6 max for this clay. I bisque really slow
since I do a lot of slab work. 50 degrees/hr up to about 350, then 75
degrees/hr up to about 500-600, then 90 degrees up to about 1,100, then 150
up to cone 05. She suggests slowing down even more at that high end of
bisque, and staying around cone 5 max on final firing. . When I mentioned
that they only bloat in the high fire, either glazed or unglazed, she tells
me that it is not related to high fire but the fact that impurities are
still locked in the clay from bisque fire. BTW, I never high fire above
250/hr, and slower for slab builts.
I REALLY like the color of this clay so I guess my solution will be to try
loading kiln with only this clay and keep those bisque firings really slow
as compaired to other clays I'm using. We'll see how it goes.
Regards,
Dale Cochoy, Wild Things Bonsai Studio, Hartville, Ohio USA
DaleCochoy@Prodigy.com http://www.WildThingsBonsai.com
Christena Schafale on fri 21 dec 01
Dale,
Long, slow bisque firings will do no harm for any of your clays, and will
probably do good. Just a thought -- no need to separate the clays.
Chris
At 11:59 AM 12/21/01 -0500, you wrote:
>I read most of the bloating thread mails over the last week or so. I have
>this problem often with one particular clay, Standard #266. Never with the
>Miller, Laguna or Ohio Ceramics clays I've used. I didn't respond to any
>mails because I was sifting through info.
>This morning I opened the kiln to find a rather large thrown pot with two
>large bloats in it. Standard 266 clay.
>I finally decided to call Standard. When I got the rep on the phone, I said
>" I'm having trouble with bloating with one of your clays", and she said "
>#266". I took this as a sign that I was not alone. According to her it is
>all a problem of impurities not getting burned out during bisque between
>800 to 1,500 degrees. Note: they never bloat during the bisque firing, just
>during high fire to cone 5 1/2-6 max for this clay. I bisque really slow
>since I do a lot of slab work. 50 degrees/hr up to about 350, then 75
>degrees/hr up to about 500-600, then 90 degrees up to about 1,100, then 150
>up to cone 05. She suggests slowing down even more at that high end of
>bisque, and staying around cone 5 max on final firing. . When I mentioned
>that they only bloat in the high fire, either glazed or unglazed, she tells
>me that it is not related to high fire but the fact that impurities are
>still locked in the clay from bisque fire. BTW, I never high fire above
>250/hr, and slower for slab builts.
>I REALLY like the color of this clay so I guess my solution will be to try
>loading kiln with only this clay and keep those bisque firings really slow
>as compaired to other clays I'm using. We'll see how it goes.
>Regards,
>Dale Cochoy, Wild Things Bonsai Studio, Hartville, Ohio USA
>DaleCochoy@Prodigy.com http://www.WildThingsBonsai.com
>
>______________________________________________________________________________
>Send postings to clayart@lsv.ceramics.org
>
>You may look at the archives for the list or change your subscription
>settings from http://www.ceramics.org/clayart/
>
>Moderator of the list is Mel Jacobson who may be reached at
>melpots@pclink.com.
Consultation and Referral Specialist
Resources for Seniors
christenas@rfsnc.org
www.resourcesforseniors.com
Phone: (919) 713-1537
FAX: (919) 872-9574
1110 Navaho Dr, Suite 400
Raleigh, NC 27609
Dale Cochoy on sat 22 dec 01
----- Original Message -----
From: Christena Schafale
To:
Sent: Friday, December 21, 2001 2:16 PM
Subject: Re: "Bloating" revisited, FYI
> Dale,
> Long, slow bisque firings will do no harm for any of your clays, and will
> probably do good. Just a thought -- no need to separate the clays.
> Chris
I figured I WAS pretty slow ( see below). I'm wondering if however a
solution might be to bisque ( slowly ) up to another cone higher, cone 04
instead of 05, thereby giving it more time/temp to burn off impurities. Any
thoughts here group.?
BTW, I did ask about air but forgot to mention in letter, I was told
definitely that air in the clay WAS NOT the reason , as I figured, and
others also mentioned here.
Dale
>
> At 11:59 AM 12/21/01 -0500, you wrote:
> >I read most of the bloating thread mails over the last week or so. I have
> >this problem often with one particular clay, Standard #266. Never with
the
> >Miller, Laguna or Ohio Ceramics clays I've used. I didn't respond to any
> >mails because I was sifting through info.
> >This morning I opened the kiln to find a rather large thrown pot with two
> >large bloats in it. Standard 266 clay.
> >I finally decided to call Standard. When I got the rep on the phone, I
said
> >" I'm having trouble with bloating with one of your clays", and she said
"
> >#266". I took this as a sign that I was not alone. According to her it
is
> >all a problem of impurities not getting burned out during bisque between
> >800 to 1,500 degrees. Note: they never bloat during the bisque firing,
just
> >during high fire to cone 5 1/2-6 max for this clay. I bisque really slow
> >since I do a lot of slab work. 50 degrees/hr up to about 350, then 75
> >degrees/hr up to about 500-600, then 90 degrees up to about 1,100, then
150
> >up to cone 05. She suggests slowing down even more at that high end of
> >bisque, and staying around cone 5 max on final firing. . When I mentioned
> >that they only bloat in the high fire, either glazed or unglazed, she
tells
> >me that it is not related to high fire but the fact that impurities are
> >still locked in the clay from bisque fire. BTW, I never high fire above
> >250/hr, and slower for slab builts.
> >I REALLY like the color of this clay so I guess my solution will be to
try
> >loading kiln with only this clay and keep those bisque firings really
slow
> >as compaired to other clays I'm using. We'll see how it goes.
> >Regards,
> >Dale Cochoy, Wild Things Bonsai Studio, Hartville, Ohio USA
> >DaleCochoy@Prodigy.com http://www.WildThingsBonsai.com
> >
>
>___________________________________________________________________________
___
> >Send postings to clayart@lsv.ceramics.org
> >
> >You may look at the archives for the list or change your subscription
> >settings from http://www.ceramics.org/clayart/
> >
> >Moderator of the list is Mel Jacobson who may be reached at
> >melpots@pclink.com.
>
> Consultation and Referral Specialist
> Resources for Seniors
> christenas@rfsnc.org
> www.resourcesforseniors.com
> Phone: (919) 713-1537
> FAX: (919) 872-9574
> 1110 Navaho Dr, Suite 400
> Raleigh, NC 27609
>
>
____________________________________________________________________________
__
> Send postings to clayart@lsv.ceramics.org
>
> You may look at the archives for the list or change your subscription
> settings from http://www.ceramics.org/clayart/
>
> Moderator of the list is Mel Jacobson who may be reached at
melpots@pclink.com.
LJTCW@AOL.COM on sat 22 dec 01
The bloating problem that I had several months ago with Columbus Clay's
Rustone, only went away when I switched to another clay or used some of the
old batch of clay. I returned 800 pounds and switched to Laguna #75. I
smashed a lot of the Rustone pots that I made as it made no difference
whether I slowed the bisque, slowed the glaze or fired without a glaze. I
think the problem was with the clay and only the clay. Columbus Clay said
they were going to look into the problem with that batch but I have not heard
anything.
Louise Jenks
> I read most of the bloating thread mails over the last week or so. I have
> this problem often with one particular clay, Standard #266. Never with the
> Miller, Laguna or Ohio Ceramics clays I've used. I didn't respond to any
> mails because I was sifting through info.
> This morning I opened the kiln to find a rather large thrown pot with two
> large bloats in it. Standard 266 clay.
> I finally decided to call Standard. When I got the rep on the phone, I
> said
> " I'm having trouble with bloating with one of your clays", and she said "
> #266". I took this as a sign that I was not alone. According to her it is
> all a problem of impurities not getting burned out during bisque between
> 800 to 1,500 degrees. Note: they never bloat during the bisque firing, just
> during high fire to cone 5 1/2-6 max for this clay. I bisque really slow
> since I do a lot of slab work. 50 degrees/hr up to about 350, then 75
> degrees/hr up to about 500-600, then 90 degrees up to about 1,100, then
> 150
> up to cone 05. She suggests slowing down even more at that high end of
> bisque, and staying around cone 5 max on final firing. . When I mentioned
> that they only bloat in the high fire, either glazed or unglazed, she tells
> me that it is not related to high fire but the fact that impurities are
> still locked in the clay from bisque fire. BTW, I never high fire above
> 250/hr, and slower for slab builts.
Dale Cochoy, Wild Things Bonsai Studio, Hartville, Ohio USA
DaleCochoy@Prodigy.com http://www.WildThingsBons
Louise Jenks
Turtle Clayworks
Cincinnati OH USA
Valerie Hawkins on tue 25 dec 01
I bisque standard 266 to cone 04 and have never had problems with bloating
at glaze cone 6 firing.
-----Original Message-----
From: Ceramic Arts Discussion List [mailto:CLAYART@LSV.CERAMICS.ORG]On
Behalf Of Dale Cochoy
Sent: Friday, December 21, 2001 11:59 AM
To: CLAYART@LSV.CERAMICS.ORG
Subject: "Bloating" revisited, FYI
I read most of the bloating thread mails over the last week or so. I have
this problem often with one particular clay, Standard #266. Never with the
Miller, Laguna or Ohio Ceramics clays I've used. I didn't respond to any
mails because I was sifting through info.
This morning I opened the kiln to find a rather large thrown pot with two
large bloats in it. Standard 266 clay.
I finally decided to call Standard. When I got the rep on the phone, I said
" I'm having trouble with bloating with one of your clays", and she said "
#266". I took this as a sign that I was not alone. According to her it is
all a problem of impurities not getting burned out during bisque between
800 to 1,500 degrees. Note: they never bloat during the bisque firing, just
during high fire to cone 5 1/2-6 max for this clay. I bisque really slow
since I do a lot of slab work. 50 degrees/hr up to about 350, then 75
degrees/hr up to about 500-600, then 90 degrees up to about 1,100, then 150
up to cone 05. She suggests slowing down even more at that high end of
bisque, and staying around cone 5 max on final firing. . When I mentioned
that they only bloat in the high fire, either glazed or unglazed, she tells
me that it is not related to high fire but the fact that impurities are
still locked in the clay from bisque fire. BTW, I never high fire above
250/hr, and slower for slab builts.
I REALLY like the color of this clay so I guess my solution will be to try
loading kiln with only this clay and keep those bisque firings really slow
as compaired to other clays I'm using. We'll see how it goes.
Regards,
Dale Cochoy, Wild Things Bonsai Studio, Hartville, Ohio USA
DaleCochoy@Prodigy.com http://www.WildThingsBonsai.com
____________________________________________________________________________
__
Send postings to clayart@lsv.ceramics.org
You may look at the archives for the list or change your subscription
settings from http://www.ceramics.org/clayart/
Moderator of the list is Mel Jacobson who may be reached at
melpots@pclink.com.
Dale Cochoy on wed 26 dec 01
Thank you, that is exactly what I was going to try next time, but possibly
stay at 5 1/2 with it.
Regards,
Dale
----- Original Message -----
From: Valerie Hawkins
To:
Sent: Tuesday, December 25, 2001 7:32 PM
Subject: Re: "Bloating" revisited, FYI
> I bisque standard 266 to cone 04 and have never had problems with bloating
> at glaze cone 6 firing.
>
> -----Original Message-----
> From: Ceramic Arts Discussion List [mailto:CLAYART@LSV.CERAMICS.ORG]On
> Behalf Of Dale Cochoy
> Sent: Friday, December 21, 2001 11:59 AM
> To: CLAYART@LSV.CERAMICS.ORG
> Subject: "Bloating" revisited, FYI
>
>
> I read most of the bloating thread mails over the last week or so. I have
> this problem often with one particular clay, Standard #266. Never with
the
> Miller, Laguna or Ohio Ceramics clays I've used. I didn't respond to any
> mails because I was sifting through info.
> This morning I opened the kiln to find a rather large thrown pot with two
> large bloats in it. Standard 266 clay.
> I finally decided to call Standard. When I got the rep on the phone, I
said
> " I'm having trouble with bloating with one of your clays", and she said "
> #266
Ron Roy on fri 28 dec 01
Hi Dale,
I suspect that clay is on the verge of being over fired at cone 6 - I also
agree with Standard in that I do think you are speeding up your bisque at
the wrong time - the crucial temperature range for burning out combustables
(important in iron bearing clays) would be from 1300F to 1650F - I suggest
100F per hour and leave a spy open - even better if you are using a vent
system attached to the kiln. If stacking is tight and/or ware is thick you
have to be even more careful.
You probably like the colour because the clay is so vitrified - still -
standard should make some changes to that body - it sounds like a constant
problem for them. If they need some expert help semd them to me. It's a
simple mater of raising the maturing tepm or taking out some of the clays
that are bringing in the contaminents.
If you need more on this contact me directly.
RR
>I finally decided to call Standard. When I got the rep on the phone, I said
>" I'm having trouble with bloating with one of your clays", and she said "
>#266". I took this as a sign that I was not alone. According to her it is
>all a problem of impurities not getting burned out during bisque between
>800 to 1,500 degrees. Note: they never bloat during the bisque firing, just
>during high fire to cone 5 1/2-6 max for this clay. I bisque really slow
>since I do a lot of slab work. 50 degrees/hr up to about 350, then 75
>degrees/hr up to about 500-600, then 90 degrees up to about 1,100, then 150
>up to cone 05. She suggests slowing down even more at that high end of
>bisque, and staying around cone 5 max on final firing. . When I mentioned
>that they only bloat in the high fire, either glazed or unglazed, she tells
>me that it is not related to high fire but the fact that impurities are
>still locked in the clay from bisque fire. BTW, I never high fire above
>250/hr, and slower for slab builts.
>I REALLY like the color of this clay so I guess my solution will be to try
>loading kiln with only this clay and keep those bisque firings really slow
>as compaired to other clays I'm using. We'll see how it goes.
Ron Roy
RR# 4
15084 Little Lake Rd..
Brighton,
Ontario, Canada
KOK 1H0
Residence 613-475-9544
Studio 613-475-3715
Fax 613-475-3513
| |
|
