WJ Seidl on wed 17 jan 07
Googling "Sapphire Kaolin" gives me this:
Sapphire Kaolin
Mol. Weight: 268.74
Category Clay
Fill Oxides Al2O3
Molecular Analysis:
K20 0.006 Al2O3 1.000 SiO2 2.057
Na2O 0.004 Fe2O3 0.012 TiO2 0.047
CaO 0.010
MgO 0.013
Percentage Analysis
45.98 % SiO2
37.93 % Al2O3
0.20 % K2O
0.10 % Na2O
0.20 % MgO
0.20 % CaO
0.70 % Fe2O3
1.39 % TiO2
13.31 % L.O.I.
Hope that helps.
Wayne Seidl
-----Original Message-----
From: Clayart [mailto:CLAYART@LSV.CERAMICS.ORG] On Behalf Of Floyd Hale
Sent: Wednesday, January 17, 2007 11:20 AM
To: CLAYART@LSV.CERAMICS.ORG
Subject: Sapphire Kaolin
Hello to Clayarters from an enthusiatic novice,
Two humble questions for the experts...
I'm trying to find a supplier for Sapphire Kaolin, an ingredient in a high
fire base glaze, anyone know of a vendor that has it? (I hope to use that
base glaze for adding Mason Stains).
Furthermore, that cone 8-11 recipe, from Georgies Ceramic and Clay Co. in
Portland OR, reads as follows:
Sapphire Kaolin 10%
EPK Kaolin 25%
Ball Clay 25%
Feldspar 20%
Flint Silica 20%
Can anyone tell from the recipe if that glaze will be gloss or matt at cone
10?
Thanks in advance for any help!
Floyd Hale
____________________________________________________________________________
__
Send postings to clayart@lsv.ceramics.org
You may look at the archives for the list or change your subscription
settings from http://www.ceramics.org/clayart/
Moderator of the list is Mel Jacobson who may be reached at
melpots@pclink.com.
Floyd Hale on wed 17 jan 07
Hello to Clayarters from an enthusiatic novice,
Two humble questions for the experts...
I'm trying to find a supplier for Sapphire Kaolin, an ingredient in a high
fire base glaze, anyone know of a vendor that has it? (I hope to use that
base glaze for adding Mason Stains).
Furthermore, that cone 8-11 recipe, from Georgies Ceramic and Clay Co. in
Portland OR, reads as follows:
Sapphire Kaolin 10%
EPK Kaolin 25%
Ball Clay 25%
Feldspar 20%
Flint Silica 20%
Can anyone tell from the recipe if that glaze will be gloss or matt at cone
10?
Thanks in advance for any help!
Floyd Hale
Hank Murrow on wed 17 jan 07
On Jan 17, 2007, at 8:19 AM, Floyd Hale wrote:
>
> I'm trying to find a supplier for Sapphire Kaolin, an ingredient in a
> high
> fire base glaze, anyone know of a vendor that has it? (I hope to use
> that
> base glaze for adding Mason Stains).
>
> Furthermore, that cone 8-11 recipe, from Georgies Ceramic and Clay Co.
> in
> Portland OR, reads as follows:
>
> Sapphire Kaolin 10%
> EPK Kaolin 25%
> Ball Clay 25%
> Feldspar 20%
> Flint Silica 20%
>
> Can anyone tell from the recipe if that glaze will be gloss or matt at
> cone
> 10?
DEar Floyd;
Your Sapphire can be ordered from Georgies in Portland OR. Your 'glaze'
recipe acctually looks like a high temp porcelain recipe. I haven't run
it through a calc program, but my experience suggests this.
Cheers, Hank
www.murrow.biz/hank
Craig Martell on wed 17 jan 07
Floyd was asking:
>I'm trying to find a supplier for Sapphire Kaolin, an ingredient in a high
>fire base glaze, anyone know of a vendor that has it?
Hello Floyd:
You can get Sapphire from Georgie's in Portland, OR. I buy it from them
all the time. If that is too far away you can contact KT Clays and get
info on who sells it and they will send you a 5 lb sample. KT mines
Sapphire and they ship it from Sandersville, GA.
>Furthermore, that cone 8-11 recipe, from Georgies Ceramic and Clay Co. in
>Portland OR, reads as follows:
This isn't a glaze, it's a white slip. Even at high fire it will be
totally dry, as in, zero gloss unless you fire it in a wood or salt kiln.
You could eliminate the Sapphire and add 10% more EPK if you want and there
would be little difference other than plasticity.
regards, Craig Martell Hopewell, Oregon
A Kettner on wed 17 jan 07
Sapphire Kaolin is also known as wc-5 kaolin
On 1/17/07, Floyd Hale wrote:
> Hello to Clayarters from an enthusiatic novice,
>
> Two humble questions for the experts...
>
> I'm trying to find a supplier for Sapphire Kaolin, an ingredient in a high
> fire base glaze, anyone know of a vendor that has it? (I hope to use that
> base glaze for adding Mason Stains).
>
> Furthermore, that cone 8-11 recipe, from Georgies Ceramic and Clay Co. in
> Portland OR, reads as follows:
>
> Sapphire Kaolin 10%
> EPK Kaolin 25%
> Ball Clay 25%
> Feldspar 20%
> Flint Silica 20%
>
> Can anyone tell from the recipe if that glaze will be gloss or matt at cone
> 10?
>
> Thanks in advance for any help!
>
> Floyd Hale
>
> ______________________________________________________________________________
> Send postings to clayart@lsv.ceramics.org
>
> You may look at the archives for the list or change your subscription
> settings from http://www.ceramics.org/clayart/
>
> Moderator of the list is Mel Jacobson who may be reached at melpots@pclink.com.
>
Don Goodrich on wed 17 jan 07
Floyd, are you sure that's a _glaze_ recipe?
Someone please correct me if I'm wrong,
but it looks more like a clay body recipe to me.
Treating it as a glaze, I get:
-----------------------------------------
Na2O 0.25 Al2O3 5.31 SiO2 24.25
K2O 0.58 P2O5 0.01
MgO 0.08 TiO2 0.15
CaO 0.08 Fe2O3 0.08
Alumina:Silica ratio is 1.00:4.57
Neutral:Acid ratio is 1.00:4.62
Alk:Neut:Acid ratio is 1.00:5.31:24.49
Expansion: 54.1 x 10e-7 per degree C
--------------------------------------
Looks like alumina is off the map, as far as glaze limit formulas.
Wonder what Georgies does with it?
Don Goodrich
>...that cone 8-11 recipe, from Georgies Ceramic and Clay Co. in
>Portland OR, reads as follows:
>
>Sapphire Kaolin 10%
>EPK Kaolin 25%
>Ball Clay 25%
>Feldspar 20%
>Flint Silica 20%
>
>Can anyone tell from the recipe if that glaze will be gloss or matt
>at cone 10?
...
>Floyd Hale
Floyd Hale on thu 18 jan 07
Upon further review of the web page from Georgie's, I see that the recipe
is only described as a "base recipe,", but the layout of the page doesn't
let the reader easily tell if the formula is for a glaze, engobe, or clay
body.
Here is a link to their page, see if it makes sense...
http://www.georgies.com/PDFs/mason-stains.pdf
Many thanks for everyone's help, looks like I should look elsewhere for a
glossy base glaze recipe for cone 10, to use with Mason Stains. I will ask
that question in a separate post.
On Wed, 17 Jan 2007 11:19:35 -0500, Floyd Hale wrote:
>Hello to Clayarters from an enthusiatic novice,
>
>Two humble questions for the experts...
>
>I'm trying to find a supplier for Sapphire Kaolin, an ingredient in a high
>fire base glaze, anyone know of a vendor that has it? (I hope to use that
>base glaze for adding Mason Stains).
>
>Furthermore, that cone 8-11 recipe, from Georgies Ceramic and Clay Co. in
>Portland OR, reads as follows:
>
>Sapphire Kaolin 10%
>EPK Kaolin 25%
>Ball Clay 25%
>Feldspar 20%
>Flint Silica 20%
>
>Can anyone tell from the recipe if that glaze will be gloss or matt at cone
>10?
>
>Thanks in advance for any help!
>
>Floyd Hale
>
>___________________________________________________________________________
___
>Send postings to clayart@lsv.ceramics.org
>
>You may look at the archives for the list or change your subscription
>settings from http://www.ceramics.org/clayart/
>
>Moderator of the list is Mel Jacobson who may be reached at
melpots@pclink.com.
Hank Murrow on thu 18 jan 07
On Jan 18, 2007, at 8:35 AM, Floyd Hale wrote:
> Upon further review of the web page from Georgie's, I see that the
> recipe
> is only described as a "base recipe,", but the layout of the page
> doesn't
> let the reader easily tell if the formula is for a glaze, engobe, or
> clay
> body.
>
> Here is a link to their page, see if it makes sense...
>
>
> http://www.georgies.com/PDFs/mason-stains.pdf
Dear Floyd;
In the heading above your recipe it says that these are recipes for
engobes(slips) at various temperatures. Looks like Craig Martell was
right on in his post.
Cheers, Hank
www.murrow.biz/hank
Dave Finkelnburg on thu 18 jan 07
Floyd,
I wouldn't worry about the Sapphire. You could
mix the recipe fine using EPK for all the kaolin.
However, the "glaze" by itself will be matte--as in,
it won't melt at cone 10. It is, rather, a recipe for
a pretty refractory porcelain clay body at C10, though
like you, I read the page as saying it's a glaze. I
have no idea what's in Mason Stains, but if 10% of any
makes this base melt, it must contain a lot of flux.
So, the recipe is for a refractory slip with, by the
way, a very low coefficient of expansion if fully
melted.
If you want a glaze, rather than an engobe, with
which to mix your stains, a very simple, high calcium
glossy base to start with would be Leach's 4321--40%
feldspar, 30% silica, 20% whiting, 10% kaolin.
However, I'm sure you know not all stains should go
into a high-calcium glaze. I suspect Mason gives
adequate guidance on what glaze chemistry is
compatible with a given stain.
Good glazing,
Dave Finkelnburg
--- Floyd Hale wrote:
> Upon further review of the web page from Georgie's,
> I see that the recipe
> is only described as a "base recipe,", but the
> layout of the page doesn't
> let the reader easily tell if the formula is for a
> glaze, engobe, or clay
> body.
____________________________________________________________________________________
We won't tell. Get more on shows you hate to love
(and love to hate): Yahoo! TV's Guilty Pleasures list.
http://tv.yahoo.com/collections/265
Ivor and Olive Lewis on fri 19 jan 07
Dear Floyd Hale,=20
The range and nature of the ingredients in this recipe:
>Sapphire Kaolin 10%
>EPK Kaolin 25%
>Ball Clay 25%
>Feldspar 20%
>Flint Silica 20%
has more in common with a Porcelain or White Stoneware Clay Body than a =
Glaze.
Best regards,
Ivor Lewis.
Redhill,
South Australia.
Don Goodrich on fri 19 jan 07
>Here is a link to their page, see if it makes sense...
>
>http://www.georgies.com/PDFs/mason-stains.pdf
Yep, it makes sense. Since the recipe is in the column under
"As Engobe or Underglaze...", I'd assume that's what that recipe
and the ones just above it are.
Good luck with your quest.
Don
| |
|
