Scott Hunnicutt on wed 22 feb 06
Hey all,
I am looking at different commercial glazes and does anyone know of a
commercial crackle glaze that you can fire at cone 06-04?
or a recipe for one?
or is crackle glazes only mid-fire/high fire?
thanks,
Scott Hunnicutt
brian on thu 23 feb 06
> On 2/23/06, Scott Hunnicutt wrote:
> > Hey all,
> > I am looking at different commercial glazes and does anyone know of a
> > commercial crackle glaze that you can fire at cone 06-04?
> > or a recipe for one?
Scott.
My recent emphasis in the area of glaze texture has been in this
temperature range........
some very open crackle, beading and crawls are caused by excessive
use of zinc, tin oxide and titanium oxide in any frit. Have a look at
http://www.gartside.info/posterlf4images.htm
If there is a specific texture you like the look of please ask again
Brian
William & Susan Schran User on thu 23 feb 06
On 2/22/06 9:36 PM, "Scott Hunnicutt" wrote:
> I am looking at different commercial glazes and does anyone know of a
> commercial crackle glaze that you can fire at cone 06-04?
> or a recipe for one?
Scott, Many of these similar questions you can answer yourself by doing a
simple web search. Using the key words "low fire crackle glaze", I found
many sites of manufacturers and suppliers.
Here's one that has images to give you an idea of the results:
http://www.bigceramicstore.com/Supplies/Glaze/glazes.htm
Look under "specialty glazes."
I'm not recommending this specific vendor, just one example.
Most of the answers for questions can be found online, in a web search or in
the Clayart archives.
In fact I'm going there now to look up something....
-- William "Bill" Schran
Fredericksburg, Virginia
wschran@cox.net
wschran@nvcc.edu
Randy O'Brien on thu 23 feb 06
Scott,
If I remember correctly, frit 3110 crazes when fired all by itself
at this temperature range. You could use a binder like cmc to help
keep it in suspension.
Randy
Ron Roy on thu 23 feb 06
I hesitate to give advice on low fire glazes - no experience so don't count
on any thing without doing the testing.
I'm not sure the 3110 will stay on the pot - very little alumina and a lot
of KNaO - best to test and protect your shelves. I will craze for sure but
it will also be very difficult to keep in suspension because of the soluble
sodium in that frit. The more clay the better - in terms of stability and
suspension.
A better solution in terms of stability and workability would be. If any do
settle out use a few drops at a time of a solution of Epsom salts to get it
suspended again - keep the glaze thicker rather than thinner.
3110 - 85.0
EPK - 15.0
Bentonite 2.0
Total - 102.0
3110 - 80.0
EPK - 20.0
Bentonite - 2.0
Total - 102.0
3110 - 75.0
EPK 25.0
Bentonite - 2.0
Total - 102.0
Stability increases as the clay content goes up - and all have a high
expansion - all will craze.
RR
>If I remember correctly, frit 3110 crazes when fired all by itself
>at this temperature range. You could use a binder like cmc to help
>keep it in suspension.
Ron Roy
RR#4
15084 Little Lake Road
Brighton, Ontario
Canada
K0K 1H0
Phone: 613-475-9544
Fax: 613-475-3513
Vicki on fri 24 feb 06
In Alternative Kilns, they give a recipe for White Crackle Raku (which I
assume would be about 06ish) 80 gerstley borate, 29 custer feldspar, then
add .5 to 8% tin oxide.
Ivor and Olive Lewis on sat 25 feb 06
Dear Brian Gartside,
Study of the table in Hamer would support your claim with regard to the =
activity of Tin Oxide, Zinc Oxide and Titanium oxide at lower firing =
temperatures. But your qualification that they are in frit form is =
important.
If unfritted, two have exceptionally high melting points and the other, =
SnO2 melting at 1100 deg C, is used as an opacifier because has a low =
solubility. So if used as raw materials all three would most likely =
remain in suspension. This then transfers the process of crawling to the =
properties of the molten frit. Which brings us back to creating a melt =
with high internal cohesion, low external adhesion, high surface tension =
and high viscosity.
Perhaps the idea we need to consider is that excess insoluble compounds =
in a molten frit create a paste that flows slowly. Which seems to keep =
things simple.
Best regards,
Ivor Lewis.
Redhill,
South Australia.
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