Carole Fox on sun 17 sep 06
I am wondering if I can use firebrick dust as one would use grog on a kiln
shelf to keep a large flat piece able to move in the firing. It is from a
box of new bricks that I recently purchased.
Thanks!
Carole Fox
Silver Fox Pottery
Elkton, MD
silverfoxpottery@comcast.net
David Hendley on sun 17 sep 06
----- Original Message -----
>I am wondering if I can use firebrick dust as one would use grog on a kiln
> shelf to keep a large flat piece able to move in the firing. It is from a
> box of new bricks that I recently purchased.
>
Sure, it would be excellent for that.
Not only can you use it "like grog", but it can BE grog in your clay, as
well.
I save all old IFBs, break them up, and use the coarse powder (sieve as
needed to avoid pieces that are too big).
It is an excellent addition to castable refractory mixes.
A mix of half firebrick dust and half clay is perfect for extruding all your
own kiln posts.
David Hendley
Maydelle, Texas
david(at)farmpots(dot)com
http://www.farmpots.com
Vince Pitelka on sun 17 sep 06
Carole Fox wrote:
>I am wondering if I can use firebrick dust as one would use grog on a kiln
> shelf to keep a large flat piece able to move in the firing. It is from a
> box of new bricks that I recently purchased.
Best to use wadding, which you can make 50-50 with any clay and flint. Mix
with water to soft clay consistency. Lay out parallel thin coils of wadding
and gently nestle the flat piece on the wadding.
Putting such a piece on a bed of sand or grog is never a good idea, because
it insulates the piece from changes in heating and cooling, and can cause it
to crack.
Good luck -
- Vince
Vince Pitelka
Appalachian Center for Craft, Tennessee Technological University
Smithville TN 37166, 615/597-6801 x111
vpitelka@dtccom.net, wpitelka@tntech.edu
http://iweb.tntech.edu/wpitelka/
http://www.tntech.edu/craftcenter/
Carole Fox on mon 18 sep 06
Vince-
Can you explain why the wadding coils wouldn't do the same thing?
Carole Fox
Silver Fox Pottery
Elkton, MD
silverfoxpottery@comcast.net
> Putting such a piece on a bed of sand or grog is never a good idea,
> because
> it insulates the piece from changes in heating and cooling, and can cause
> it
> to crack.
> Good luck -
> - Vince
Snail Scott on mon 18 sep 06
On Sep 17, 2006, at 8:04 PM, Vince Pitelka wrote:
> Putting such a piece on a bed of sand or grog is never a good idea,
> because
> it insulates the piece from changes in heating and cooling, and can
> cause it
> to crack...
I agree with you that a bed of sand is problematical,
but I find that a very thin dusting of sand is entirely
adequate to allow movement between the clay and
the shelf, while keeping the heating and cooling
conditions similar to a bare shelf. The sand grains
act like little ball bearings, and it doesn't take much
to get a real benefit.
-Snail Scott
Lee Love on tue 19 sep 06
I don't know if this helps:
At Shimaoka's workshop, the big blue osara in the salt chamber were placed
on two large disks of fireclay, with an alumina layer between the two
disks. On top of the top disks were placed wad filled shells. The large
osara/platters were then placed on the shells.
The same was done for the work in the fire chamber and in the yohen
chamber, except no alumina was placed between the disks. The disks in
the yohen chamber were place upon a bed of wetted ricehull ash.
Two disks were used to allow the top disk to expand and contract on the
bottom disk.
--
Lee in Mashiko, Japan
http://potters.blogspot.com/
"Let the beauty we love be what we do." - Rumi
Craig Clark on wed 20 sep 06
Carol, just save it and use it in a castable mix if and when you need one.
Hope this helps
Craig Dunn Clark
619 East 11 1/2 St
Houston, Texas 77008
(713)861-2083
mudman@hal-pc.org
Carole Fox wrote:
> Thank you for explaining further.I will keep it in mind for future
> firings.
>
> Now, I'm still looking for a way to use this firebrick dust!
>
> Carole Fox
> Silver Fox Pottery
> Elkton, MD
> silverfoxpottery@comcast.net
>
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Carole Fox on wed 20 sep 06
Thank you for explaining further.I will keep it in mind for future firings.
Now, I'm still looking for a way to use this firebrick dust!
Carole Fox
Silver Fox Pottery
Elkton, MD
silverfoxpottery@comcast.net
Snail Scott on thu 21 sep 06
On Sep 20, 2006, at 6:25 PM, Carole Fox wrote:
>
> Now, I'm still looking for a way to use this firebrick dust!
>
Firebrick dust is my favorite grog. -Snail
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