Paul Herman on sat 17 jun 06
Hello All,
I've got another question.
Why would you put bentonite in kiln wash?
Best,
Paul Herman
Great Basin Pottery
Doyle, California US
http://greatbasinpottery.com
On Jun 17, 2006, at 12:16 PM, Tom King wrote:
> Earl Brunner,
>
> In an archive search for kiln wash recommendations
> I found a mixture you posted in '98:
>
> 60 parts Alumina hydrate
> 30 parts EPK
> 10 parts Bentonite
>
> You said that you used this on both sides of the shelf
> and flipped them every other firing..."no turds on the
> pottery".
>
> Do you continue to trust this mix?
> May I assume parts are be weight?
>
> Thanks for the help.
>
> Tom King
>
>
Earl Brunner on sat 17 jun 06
That is still my kiln wash of choice. I searched all of 1998 for messages related to kiln was and found one from me with the recipe. I didn't find one where I said I flipped shelves that had wash on both sides........
That's awhile ago, the shelves I fire the most right now are in electric to cone 6, That is the recipe I use, and I do occaisonally flip the shelves, but I grind the wash off and apply a fresh coat to the new "up" side. We use one inch Thorley's mostly. Kiln wash doesn't seem to do much good, glaze goes right through the wash. I used to grind them down, flush and wash over the glaze, but the glaze is still there and will flux the wash. Now I use a cold chisel to remove drips, it takes some of the shelf with it, but generally gets all of the glaze.
Since this is in a community studio with a lot of student work, there are a lot of glaze "accidents". What I have been doing lately is putting a pre-made, kilnwashed "cookie" (bisqued thin clay disk) under suspect pots. Really bad ones get rejected until fixed. I would maybe treat silicon carbide shelves a bit differently.
Tom King wrote:
Earl Brunner,
In an archive search for kiln wash recommendations
I found a mixture you posted in '98:
60 parts Alumina hydrate
30 parts EPK
10 parts Bentonite
You said that you used this on both sides of the shelf
and flipped them every other firing..."no turds on the
pottery".
Do you continue to trust this mix?
May I assume parts are be weight?
Thanks for the help.
Tom King
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Earl Brunner
e-mail: brunv53@yahoo.com
Tom King on sat 17 jun 06
Earl Brunner,
In an archive search for kiln wash recommendations
I found a mixture you posted in '98:
60 parts Alumina hydrate
30 parts EPK
10 parts Bentonite
You said that you used this on both sides of the shelf
and flipped them every other firing..."no turds on the
pottery".
Do you continue to trust this mix?
May I assume parts are be weight?
Thanks for the help.
Tom King
Gail Dapogny on sun 18 jun 06
Tom,
At our guild, we have learned-- the hard way-- to insist upon clay
wasters (clay disks), for all student work. We sometimes remove the
wasters from our advanced students' work, but that decision is up to
the experienced stackers who know which students have developed
enough to become reliable. It has helped greatly in the preservation
of our shelves. Occasionally, as kiln chair, I put out a plea for
some new wasters, and members usually come through with several
wasters per person, in their usual generous fashion. This policy has
also motivated members to use the wasters for new or iffy glazes.
Gail Dapogny in Ann Arbor
On Jun 17, 2006, at 10:12 PM, Earl Brunner wrote:
> That is still my kiln wash of choice. I searched all of 1998 for
> messages related to kiln was and found one from me with the
> recipe. I didn't find one where I said I flipped shelves that had
> wash on both sides........
> That's awhile ago, the shelves I fire the most right now are in
> electric to cone 6, That is the recipe I use, and I do occaisonally
> flip the shelves, but I grind the wash off and apply a fresh coat
> to the new "up" side. We use one inch Thorley's mostly. Kiln wash
> doesn't seem to do much good, glaze goes right through the wash. I
> used to grind them down, flush and wash over the glaze, but the
> glaze is still there and will flux the wash. Now I use a cold
> chisel to remove drips, it takes some of the shelf with it, but
> generally gets all of the glaze.
> Since this is in a community studio with a lot of student work,
> there are a lot of glaze "accidents". What I have been doing
> lately is putting a pre-made, kilnwashed "cookie" (bisqued thin
> clay disk) under suspect pots. Really bad ones get rejected until
> fixed. I would maybe treat silicon carbide shelves a bit differently.
>
> Tom King wrote:
> Earl Brunner,
>
> In an archive search for kiln wash recommendations
> I found a mixture you posted in '98:
>
> 60 parts Alumina hydrate
> 30 parts EPK
> 10 parts Bentonite
>
> You said that you used this on both sides of the shelf
> and flipped them every other firing..."no turds on the
> pottery".
>
> Do you continue to trust this mix?
> May I assume parts are be weight?
>
> Thanks for the help.
>
> Tom King
>
> ______________________________________________________________________
> ________
> 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.
>
>
>
> Earl Brunner
> e-mail: brunv53@yahoo.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.
>
>
Dave Finkelnburg on sun 18 jun 06
Paul,
The bentonite helps suspend the alumina, and also
increases the dry strength of the wash, to help keep
it from dusting off due to handling before firing.
Good wood firing to you!
Dave Finkelnburg
--- Paul Herman wrote:
> Why would you put bentonite in kiln wash?
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Peter Coates on sun 18 jun 06
I do not know what Earl has to say, but i add bentonite to kiln wash
because it makes it jell-up and it brushes and rolls on much better
then with out...
I have worked at a busy art center for the last nine years where
trouble is guaranteed. My basic recipe though it changes here and
there in how much of each is,
alumina hydrate, kaolin, calcined kaolin, a bit of zircopax, and a
bit of bentonite.
My biggest discoveries over the years of trying tons of different
recipes are calcined kaolin and bentonite.
hope that helps
Peter
Oklahoma City
On Jun 17, 2006, at 10:03 PM, Paul Herman wrote:
> Hello All,
>
> I've got another question.
>
> Why would you put bentonite in kiln wash?
>
> Best,
>
> Paul Herman
>
>
>
>
> On Jun 17, 2006, at 12:16 PM, Tom King wrote:
>
>> Earl Brunner,
>>
>> In an archive search for kiln wash recommendations
>> I found a mixture you posted in '98:
>>
>> 60 parts Alumina hydrate
>> 30 parts EPK
>> 10 parts Bentonite
>>
>> You said that you used this on both sides of the shelf
>> and flipped them every other firing..."no turds on the
>> pottery".
>>
>> Do you continue to trust this mix?
>> May I assume parts are be weight?
>>
>> Thanks for the help.
>>
>> Tom King
>>
>>
threereeds1 on mon 19 jun 06
----- Original Message -----
From: "Peter Coates"
To:
Sent: Sunday, June 18, 2006 11:48 PM
Subject: Re: Earls kiln wash
>I do not know what Earl has to say, but i add bentonite to kiln wash
> because it makes it jell-up and it brushes and rolls on much better
> then with out...
> I have worked at a busy art center for the last nine years where
> trouble is guaranteed. My basic recipe though it changes here and
> there in how much of each is,
> alumina hydrate, kaolin, calcined kaolin, a bit of zircopax, and a
> bit of bentonite.
> My biggest discoveries over the years of trying tons of different
> recipes are calcined kaolin and bentonite.
>
> hope that helps
> Peter
> Oklahoma City
>
Peter, Appreciate the help. I understand about the bentonite, but now
am curious about the zircopax.
Regards,
Tom King
BTW, I had a chance to visit your facility in OKC. You and all involved
should be proud of what you can offer in facilities and inspiration.
____________________________________________________________________________
> 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.
>
Snail Scott on wed 21 jun 06
At 08:41 AM 6/21/2006 +1000, you wrote:
>Our original kiln wash was:
>Zircon flour 90
>Kaolin 10
>Our local supplier no longer carries zircon flour...
Zircon flour is widely used in ceramic-shell foundry
casting. A foundry that uses that process might
recommend a source, if you still want it.
-Snail
Des & Jan Howard on wed 21 jun 06
Tom
Our original kiln wash was:
Zircon flour 90
Kaolin 10
Our local supplier no longer carries zircon flour so we started using
Zircosil/Zircopax (same horse, different jockey).
Even though it is almost twice the price Jan prefers it, because it
covers better,
slower to settle in the bucket & when it does settle it doesn't do it as
a block of concrete.
Des
threereeds1 wrote:
> Peter, Appreciate the help. I understand about the bentonite, but now
> am curious about the zircopax.
>
> Regards,
> Tom King
--
Des & Jan Howard
Lue Pottery
LUE NSW 2850
Australia
Ph/Fax 02 6373 6419
http://www.luepottery.hwy.com.au
Joe Brecha on thu 22 jun 06
We carry Zircon powder at Clay Art Center. clayartcenter.net or call 1 =
800 952 8030 Joe Brecha
Des & Jan Howard on thu 22 jun 06
Snail
What I meant was our local supplier, who are agents for a national
company, no longer stock zircon flour. We try to patronise the agent
as they make periodic trips throughout our region dropping off
the larger items. So, even though we could still get the zircon flour,
we now prefer to use Zircosil/Zircopax.
Thanks for the foundry hint, it nudged me onto an
aluminium casting task I've been mulling.
Des
Snail Scott wrote:
>At 08:41 AM 6/21/2006 +1000, you wrote:
>
>
>>Our original kiln wash was:
>>Zircon flour 90
>>Kaolin 10
>>Our local supplier no longer carries zircon flour...
>>
>>
>
>Zircon flour is widely used in ceramic-shell foundry
>casting. A foundry that uses that process might
>recommend a source, if you still want it.
>
>
--
Des & Jan Howard
Lue Pottery
LUE NSW 2850
Australia
Ph/Fax 02 6373 6419
http://www.luepottery.hwy.com.au
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