Rod Wuetherick on sun 3 oct 04
Craig,
If you are only using Soda Ash as a flux I would suggest using a less
difficult material. If you are low firing a boron frit, etc., would serve
your purposes much better. Unless there is an absolute specific reason to
use a soluble material you are best to use something else, soluble materials
are inherently unreliable.
If your soda is crystallizing you have probably reached saturation. Using
this much Soda can only eventually lead to a disaster.
Tell us the recipe you are using, the cone you are firing too, and your
reasons for using Soda Ash as a flux and we will be able to help you in
better informed manner. Though with the information you provided I suspect
there are a plethora of better alternatives for you to research and try.
Best,
Rod
I've found soda ash to be an powerful flux in a glaze but when I increase
the percentage it starts to recrystallise out of solution and form small
lumps which makes spraying difficult.
Is the such a thing as insoluble soda ash ,or do you have any suggestions
that might solve this problem.
Thanks for your help
Craig
Craig Gallien on mon 4 oct 04
I've found soda ash to be an powerful flux in a glaze but when I =
increase the percentage it starts to recrystallise out of solution and =
form small lumps which makes spraying difficult.=20
Is the such a thing as insoluble soda ash ,or do you have any =
suggestions that might solve this problem.
Thanks for your help
Craig
Louis Katz on mon 4 oct 04
Soda ash has a limited solubility in water. It varies with temperature.
If you get all the soda ash dissolved that can be at a given
temperature it is called saturated. If you change the temperature and
the maximum amount that is soluble goes down some will come out of
solution. It tends to recrystalize on soda ash that is not still in
solution, hence the particles get bigger.
Louis
> I've found soda ash to be an powerful flux in a glaze but when I
> increase the percentage it starts to recrystallise out of solution and
> form small lumps which makes spraying difficult.
>
> Is the such a thing as insoluble soda ash ,or do you have any
> suggestions that might solve this problem.
>
> Thanks for your help
>
> Craig
>
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Louis Katz
http://www.tamucc.edu/~lkatz
Sue Leabu on mon 4 oct 04
Craig,
Measure out the soda ash for your glaze, and then completely disolve it in
hot water. Add the rest of your glaze ingredients to this solution, adding
more warm water as needed to get the glaze to the proper consistency.
Sue, Kalamazoo
On Mon, 4 Oct 2004 10:15:31 -0700, Craig Gallien
wrote:
>I've found soda ash to be an powerful flux in a glaze but when I increase
the percentage it starts to recrystallise out of solution and form small
lumps which makes spraying difficult.
>
>Is the such a thing as insoluble soda ash ,or do you have any suggestions
that might solve this problem.
>
>Thanks for your help
>
>Craig
wjskw@BELLSOUTH.NET on mon 4 oct 04
Craig:
From John Britt's "The Complete Guide to High Fire Glazes" page 18
"Insoluble sources of sodium oxide include sodium feldspars,
Minspar, Kona F-4, NC-4, Bainbridge, Eureka, Godfrey, and cryolite.
It's also present in potash feldspars, including Custer, G-200,
K-200, Plastic Vitrox, Cornwall Stone, volcanic ash, and
rottenstone. Soluble forms of sodium oxide include soda ash, baking
soda, borax, unwashed wood ash, Gerstley Borate, and its
substitutes, and sodium silicate. Nepheline Syenite and frits are
slightly soluble."
Hope that helps,
Wayne Seidl
-----Original Message-----
Subject: insoluble soda ash?
I've found soda ash to be an powerful flux in a glaze but when I
increase the percentage it starts to recrystallise out of solution
and form small lumps which makes spraying difficult.=20
Is the such a thing as insoluble soda ash ,or do you have any
suggestions that might solve this problem.
Thanks for your help
Craig
Ivor and Olive Lewis on tue 5 oct 04
Dear Craig Gallien,
Anhydrous Sodium Carbonate is the chemical name for Soda Ash. Sodium
Carbonate is a single substance and it is always soluble in water.
Sodium Carbonate can be obtained either as an anhydrous powder or as a
crystalline solid.
When Sodium Carbonate dissolves in water it enters into chemical
reactions with that liquid to form crystalline solids. One is Sodium
Carbonate Monohydrate, the other is Sodium Carbonate Decahydrate, also
known as Common Washing Soda. This will form crystals when the mixture
cools below about 35=BA C . Even though there are suggestions to replace
Soda Ash with other Sodium compounds or minerals which contain the
element Sodium in their constitution, in the long term, Sodium can be
leached from those substances and from sodium bearing glazes.
Best regards,
Ivor Lewis.
Redhill,
S. Australia.
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