Tig Dupre on wed 19 oct 05
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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.
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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
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