Tig Dupre on wed 19 oct 05
-------------------------------<>-----------------------------
John Rogers wrote:
... Now I only use powdered alumina hydrate. Why all this? Well, I
have gotten heavily into porcelain, and it moves a LOT when fired to
maturity. By using the powdered Alumina Hydrate, the porcelain moves
around as if it is on rollers.
-------------------------------<>-----------------------------
John,
Do you fire electric? If so, doesn't the powdered alumina hydrate float and stick into the glazes? Or do you mix it in a liquid and paint it on the shelves to make it a little harder to float?
Just curious, because it sounds like a really good idea. I use Gator Mud as a kiln wash. (Let's see if I can recall the recipe--I'm not at home just now.)
EPK 25
Calcined EPK 25
Alumina hydrate 25
Silica 25
-----------------------
Total 100
Add:
Zirconium 5%
Put it on with a house paint roller to get a good smooth, even coating. Three coats, cross-wise each coat--one North-South, one East-West, one North-South.
But...
If I can make do with a dusting of alumina hydrate, I'll forsake all the trouble of making a wash.
Thanks,
Tig
Wayne Seidl on wed 19 oct 05
Tig:=20
I'm sure John will answer, but I'm going to stick my 2=A2 in too
Refer to your message.
Yes, electric
no, it doesn't stick to the glazes, since I only glaze to within 1/4
inch of the bottom, doesn't appreciably move during the firing,
though the pots sure do.
No painting, no liquid, no muss no fuss. I put about two pounds or
so in an old Parmesan cheese shaker can (Kraft, if you must know:>)
and shake liberally, (albeit carefully near the shelf edges) as I
load the shelf, perhaps 1/8 inch thick. A decent layer, anyway.
then set the pots.
I recycle it by removing the shelf during the unloading and scraping
it back into the container via a funnel. It's now going on its 6th
firing to ^10.
I would not use silica in a kiln wash on which you are setting
porcelain. Well, I'll never do it again, anyhow. I'd rather spend
time throwing than angle grinding kiln shelves. For porcelain, with
not too drippy glazes, the alumina does the trick for me.
Best,
Wayne Seidl
-----Original Message-----
From: Clayart [mailto:CLAYART@LSV.CERAMICS.ORG] On Behalf Of Tig
Dupre
Sent: Wednesday, October 19, 2005 10:38 AM
To: CLAYART@LSV.CERAMICS.ORG
Subject: Re: Kiln Wash Problems
-------------------------------<>-----------------------------
John Rogers wrote:
... Now I only use powdered alumina hydrate. Why all this? Well, I
have gotten heavily into porcelain, and it moves a LOT when fired to
maturity. By using the powdered Alumina Hydrate, the porcelain moves
around as if it is on rollers.
-------------------------------<>-----------------------------
John,
Do you fire electric? If so, doesn't the powdered alumina hydrate
float and stick into the glazes? Or do you mix it in a liquid and
paint it on the shelves to make it a little harder to float?
Just curious, because it sounds like a really good idea. I use
Gator Mud as a kiln wash. (Let's see if I can recall the
recipe--I'm not at home just now.)
EPK 25
Calcined EPK 25
Alumina hydrate 25
Silica 25
-----------------------
Total 100
Add:
Zirconium 5%
Put it on with a house paint roller to get a good smooth, even
coating. Three coats, cross-wise each coat--one North-South, one
East-West, one North-South.
But...
If I can make do with a dusting of alumina hydrate, I'll forsake all
the trouble of making a wash.
Thanks,
Tig
Hank Murrow on wed 19 oct 05
On Oct 19, 2005, at 7:38 AM, Tig Dupre wrote:
> -------------------------------<>-----------------------------
> John Rogers wrote:
> ... Now I only use powdered alumina hydrate. Why all this? Well, I
> have gotten heavily into porcelain, and it moves a LOT when fired to
> maturity. By using the powdered Alumina Hydrate, the porcelain moves
> around as if it is on rollers.
> -------------------------------<>-----------------------------
>
> John,
>
> Do you fire electric? If so, doesn't the powdered alumina hydrate
> float and stick into the glazes? Or do you mix it in a liquid and
> paint it on the shelves to make it a little harder to float?
Dear Tig;
Try John's suggestion on one of your shelves for a fire or two to see
if it helps you. I have used it on my Advancer shelves for years and it
works a treat. On porcelain, I also use alumina enriched wax.
Cheers, Hank
www.murrow.biz/hank
Fay and Ralph Loewenthal on fri 15 jul 11
Hi Clayart Listers, I received a recipe for kiln wash from Don Jung April
1997. He said it was a combination of Robin Tetu=3DE2=3D80=3D99s, and Tom B=
uck=3DE2=3D
=3D80=3D99s
recipes. It worked very well for me in South Africa, even on the stainless
steel moulds that I used to slump glass over. Here in Israel it seems to
peel off after one firing. Can it be the difference in raw materials betwee=
=3D
n
South Africa, and Israel? I have used the same recipe as before.
The recipe is:
Alumina Hydrate 40
EPK 30
Kyanite (35#) 17 - I substituted calcined fire clay as Kyanite wa=
=3D
s
not available
Silica Sand 16
Kind regards from Ralph Loewenthal.
William & Susan Schran User on fri 15 jul 11
On 7/15/11 3:12 AM, "Fay and Ralph Loewenthal"
wrote:
> Hi Clayart Listers, I received a recipe for kiln wash from Don Jung April
> 1997. He said it was a combination of Robin Tetu=3DC3=3DA2=3DE2=3D82=3DAC=
=3DE2=3D84=3DA2s, and Tom Buck=3DC3=3DA2=3D
=3DE2=3D82=3DAC=3DE2=3D84=3DA2s
> recipes. It worked very well for me in South Africa, even on the stainles=
=3D
s
> steel moulds that I used to slump glass over. Here in Israel it seems to
> peel off after one firing. Can it be the difference in raw materials betw=
=3D
een
> South Africa, and Israel? I have used the same recipe as before.
> The recipe is:
> Alumina Hydrate 40
> EPK 30
> Kyanite (35#) 17 - I substituted calcined fire clay as Kyanite =
=3D
was
> not available
> Silica Sand 16
Ralph,
You have probably answered your question by providing the wash recipe.
That you have substituted fire clay for the kyanite may be the problem.
I'd suggest you simply eliminate the fire clay and just use the 3 materials
and see how that works.
I use a recipe of Alumina hydrate and EPK, 50/50 by volume ( a scoop of
each) and it probably works out to near the proportion of alumina/kaolin yo=
=3D
u
are using. I generally have no peeling issues.
Bill
--=3D20
William "Bill" Schran
wschran@cox.net
wschran@nvcc.edu
http://www.creativecreekartisans.com
Snail Scott on fri 15 jul 11
On Jul 15, 2011, at 2:12 AM, Fay and Ralph Loewenthal wrote:
> Hi Clayart Listers, I received a recipe for kiln wash...It worked very =
=3D
well for me in South Africa, even on the stainless
> steel moulds that I used to slump glass over. Here in Israel it seems =3D
to
> peel off after one firing...
Yes, I think the lack of kyanite and addition of=3D20
the clay is the issue. Clay, even calcined, will=3D20
shrink. If you can't get kyanite, better to do without=3D20
it rather than use an unsuitable replacement.
-Snail=3D
Ellizabeth Gamelin on fri 15 jul 11
Hi,
I'm just jumping in here to ask about this kiln wash recipe. I have issues
with flaking and would love to find a recipe that holds on better.
*Bill said,
"I use a recipe of Alumina hydrate and EPK, 50/50 by volume ( a scoop of
each) and it probably works out to near the proportion of alumina/kaolin yo=
=3D
u
are using. I generally have no peeling issues.*"
No silica in your kiln wash recipe?
~Liz
Mountain Home Pottery
www.mountainhomepottery.etsy.com
On Fri, Jul 15, 2011 at 8:34 AM, William & Susan Schran User <
wschran@cox.net> wrote:
> On 7/15/11 3:12 AM, "Fay and Ralph Loewenthal"
> wrote:
>
> > Hi Clayart Listers, I received a recipe for kiln wash from Don Jung Apr=
=3D
il
> > 1997. He said it was a combination of Robin Tetu=3DE2=3D80=3D99s, and T=
om Buc=3D
k=3DE2=3D80=3D99s
> > recipes. It worked very well for me in South Africa, even on the
> stainless
> > steel moulds that I used to slump glass over. Here in Israel it seems t=
=3D
o
> > peel off after one firing. Can it be the difference in raw materials
> between
> > South Africa, and Israel? I have used the same recipe as before.
> > The recipe is:
> > Alumina Hydrate 40
> > EPK 30
> > Kyanite (35#) 17 - I substituted calcined fire clay as Kyanit=
=3D
e
> was
> > not available
> > Silica Sand 16
>
> Ralph,
> You have probably answered your question by providing the wash recipe.
> That you have substituted fire clay for the kyanite may be the problem.
> I'd suggest you simply eliminate the fire clay and just use the 3 materia=
=3D
ls
> and see how that works.
>
> I use a recipe of Alumina hydrate and EPK, 50/50 by volume ( a scoop of
> each) and it probably works out to near the proportion of alumina/kaolin
> you
> are using. I generally have no peeling issues.
>
> Bill
>
> --
> William "Bill" Schran
> wschran@cox.net
> wschran@nvcc.edu
> http://www.creativecreekartisans.com
>
Steve Mills on sat 16 jul 11
None in mine either, which is a gnat's whisker from Bill's:
2 parts by weight Alumina Hydrate
1 PBW Kaolin
Simple is often best!
Steve M
Steve Mills
Bath
UK
www.mudslinger.me.uk
Sent from my Ipod touch
On 15 Jul 2011, at 23:02, Ellizabeth Gamelin M=3D
> wrote:
> Hi,
> I'm just jumping in here to ask about this kiln wash recipe. I have issue=
s=3D
> with flaking and would love to find a recipe that holds on better.
> *Bill said,
> "I use a recipe of Alumina hydrate and EPK, 50/50 by volume ( a scoop of
> each) and it probably works out to near the proportion of alumina/kaolin =
y=3D
ou
> are using. I generally have no peeling issues.*"
>=3D20
> No silica in your kiln wash recipe?
>=3D20
> ~Liz
> Mountain Home Pottery
> www.mountainhomepottery.etsy.com
>=3D20
>=3D20
>=3D20
> On Fri, Jul 15, 2011 at 8:34 AM, William & Susan Schran User <
> wschran@cox.net> wrote:
>=3D20
>> On 7/15/11 3:12 AM, "Fay and Ralph Loewenthal"
>> wrote:
>>=3D20
>>> Hi Clayart Listers, I received a recipe for kiln wash from Don Jung Apr=
i=3D
l
>>> 1997. He said it was a combination of Robin Tetu=3DC3=3DA2=3DE2=3D82=3D=
AC=3DE2=3D84=3DA2=3D
s, and Tom Buck=3DC3=3DA2=3DE2=3D82=3DAC=3DE2=3D84=3DA2s
>>> recipes. It worked very well for me in South Africa, even on the
>> stainless
>>> steel moulds that I used to slump glass over. Here in Israel it seems t=
o=3D
>>> peel off after one firing. Can it be the difference in raw materials
>> between
>>> South Africa, and Israel? I have used the same recipe as before.
>>> The recipe is:
>>> Alumina Hydrate 40
>>> EPK 30
>>> Kyanite (35#) 17 - I substituted calcined fire clay as Kyanit=
e=3D
>> was
>>> not available
>>> Silica Sand 16
>>=3D20
>> Ralph,
>> You have probably answered your question by providing the wash recipe.
>> That you have substituted fire clay for the kyanite may be the problem.
>> I'd suggest you simply eliminate the fire clay and just use the 3 materi=
a=3D
ls
>> and see how that works.
>>=3D20
>> I use a recipe of Alumina hydrate and EPK, 50/50 by volume ( a scoop of
>> each) and it probably works out to near the proportion of alumina/kaolin
>> you
>> are using. I generally have no peeling issues.
>>=3D20
>> Bill
>>=3D20
>> --
>> William "Bill" Schran
>> wschran@cox.net
>> wschran@nvcc.edu
>> http://www.creativecreekartisans.com
>>=3D20
ivor and olive lewis on sat 16 jul 11
Dear Ralph Loewenthal,
See if you can find a source of Sillimanite powder and sub this for the
Kyanite.
Regards,
Ivor Lewis,
REDHILL,
South Australia
Ron Roy on sat 16 jul 11
Hi Liz,
Silica is not a very good ingredient for kiln wash except for low firing.
It is especially a problem with medium to high fire porcelainious =3D20
bodies - they have a lots of spar or neph sy and the soda and =3D20
potassium in those materials wants to combine
with silica. The result is pieces of pots getting stuck to kiln shelves.
RR
Quoting Ellizabeth Gamelin :
> Hi,
> I'm just jumping in here to ask about this kiln wash recipe. I have issue=
s
> with flaking and would love to find a recipe that holds on better.
> *Bill said,
> "I use a recipe of Alumina hydrate and EPK, 50/50 by volume ( a scoop of
> each) and it probably works out to near the proportion of alumina/kaolin =
y=3D
ou
> are using. I generally have no peeling issues.*"
>
> No silica in your kiln wash recipe?
>
> ~Liz
> Mountain Home Pottery
> www.mountainhomepottery.etsy.com
>
>
>
> On Fri, Jul 15, 2011 at 8:34 AM, William & Susan Schran User <
> wschran@cox.net> wrote:
>
>> On 7/15/11 3:12 AM, "Fay and Ralph Loewenthal"
>> wrote:
>>
>> > Hi Clayart Listers, I received a recipe for kiln wash from Don Jung Ap=
r=3D
il
>> > 1997. He said it was a combination of Robin Tetu=3DC3=3DA2=3DE2=3D82=
=3DAC=3DE2=3D84=3D
=3DA2s, and Tom Buck=3DC3=3DA2=3DE2=3D82=3DAC=3DE2=3D84=3DA2s
>> > recipes. It worked very well for me in South Africa, even on the
>> stainless
>> > steel moulds that I used to slump glass over. Here in Israel it seems =
t=3D
o
>> > peel off after one firing. Can it be the difference in raw materials
>> between
>> > South Africa, and Israel? I have used the same recipe as before.
>> > The recipe is:
>> > Alumina Hydrate 40
>> > EPK 30
>> > Kyanite (35#) 17 - I substituted calcined fire clay as Kyani=
t=3D
e
>> was
>> > not available
>> > Silica Sand 16
>>
>> Ralph,
>> You have probably answered your question by providing the wash recipe.
>> That you have substituted fire clay for the kyanite may be the problem.
>> I'd suggest you simply eliminate the fire clay and just use the 3 materi=
a=3D
ls
>> and see how that works.
>>
>> I use a recipe of Alumina hydrate and EPK, 50/50 by volume ( a scoop of
>> each) and it probably works out to near the proportion of alumina/kaolin
>> you
>> are using. I generally have no peeling issues.
>>
>> Bill
>>
>> --
>> William "Bill" Schran
>> wschran@cox.net
>> wschran@nvcc.edu
>> http://www.creativecreekartisans.com
>>
>
| |
|
