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kiln wash / alumina hydrate dusting

updated mon 30 jun 97

 

Judith Enright on wed 11 jun 97

With the recent recommendations for kiln wash or, alternatively,
dusting the shelves with alumina hydrate (recommended for porcelain
glaze firings in particular), I thought I'd add this: I dusted with
the alumina hydrate and then (stupidly, I'll admit) proceeded to use
the EnviroVent during a glaze firing. This doesn't work. In my
experience, the stuff did not lay obediently on the shelves but tended
to want to fly around a bit thereby ruining what should have been a
perfectly good load.

Any recommendations on this, other than refraining from using the
E-Vent?

TIA

-- Judith Enright @ Black Leopard Clayware & Pottery

David Woodin Set Clayart Digest on thu 12 jun 97

You don't need kiln wash if you use ITC 100 call 904-285-0200 for more
information.

Jasper Stil on mon 16 jun 97

------------------
On Wed, 11 Jun 1997 17:50:51 EDT, you wrote:

=3E ----------------------------Original message----------------------------
=3E With the recent recommendations for kiln wash or, alternatively,
=3E dusting the shelves with alumina hydrate (recommended for porcelain
=3E glaze firings in particular), I thought I'd add this: I dusted =
with
=3E the alumina hydrate and then (stupidly, I'll admit) proceeded to =
use
=3E the EnviroVent during a glaze firing. This doesn't work. In my
=3E experience, the stuff did not lay obediently on the shelves but =
tended
=3E to want to fly around a bit thereby ruining what should have been a
=3E perfectly good load.
=3E
=3E

Hi Judith
I've read that when using alumina hydrate on shelves, you need to fire the =
kiln
empty to 1250c, 3 times before it's safe for use.
I suppose that was'nt what you did? and that's why I don't use the stuff.
Hope you'll solve the problem.
Marie Claire

Suzanne Storer on mon 16 jun 97

Judith,
In response to your dusting with alumina hydrate not working:
I dust my shelves lightly with silica sand now, per suggestion on clayart.
Big help and thanks to whomever suggested it. I use an envirovent and fire
to cone 5. Works fine. I assume any silica that may fly onto the glaze just
fires right in like the other silica in the glaze. I dump a little silica
on the shelf and lightly brush it around with a large house paint brush,
dumping off any excess.
Suzanne Storer