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Firing of pots with cracks made with Sodium Silicate


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#1 Evelyne Schoenmann

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Posted 26 April 2012 - 02:20 AM

There is a discussion going on the site where Randy Brodnax shows his trick with the nice cracks made with Sodium Silicate. We all are in the dark how to fire the pots. On his DVD one can see that he fires his pot in a gas kiln in his backyard, but it would be great if anybody could tell us whether one can fire the pots also in an electric kiln (temp.??) or in a pit fire (or drum) and whether one can glaze the pots after drying and before firing. A week ago I was writing to the email address of Randy Brodnax, but, alas, didn't get an answer. Maybe he's out of town.
Anybody?

Thanks in advance and greetings from Switzerland

Evelyne

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#2 Marcia Selsor

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Posted 26 April 2012 - 06:08 AM

I never thought of firing them was anything out of the ordinary. My students make them
and we fire them like anything thing else. It depends on if the clay is low fire or high fire.
Just fire according to what type of clay it is.

Marcia



#3 meisie

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Posted 28 April 2012 - 09:28 AM

There is a discussion going on the site where Randy Brodnax shows his trick with the nice cracks made with Sodium Silicate. We all are in the dark how to fire the pots. On his DVD one can see that he fires his pot in a gas kiln in his backyard, but it would be great if anybody could tell us whether one can fire the pots also in an electric kiln (temp.??) or in a pit fire (or drum) and whether one can glaze the pots after drying and before firing. A week ago I was writing to the email address of Randy Brodnax, but, alas, didn't get an answer. Maybe he's out of town.
Anybody?

Thanks in advance and greetings from Switzerland

Evelyne


I want to say the same as Marcia. I went to a friends studio and he used sodium silicate to make the cracks and he appears to fire in his electric kiln as he would any pot. I have done a couple of pots this way but as of yet have not fired them but I never expected that they would need to be fired any other way that what the clay body type I have dictates.

#4 acg

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Posted 28 April 2012 - 10:04 AM


There is a discussion going on the site where Randy Brodnax shows his trick with the nice cracks made with Sodium Silicate. We all are in the dark how to fire the pots. On his DVD one can see that he fires his pot in a gas kiln in his backyard, but it would be great if anybody could tell us whether one can fire the pots also in an electric kiln (temp.??) or in a pit fire (or drum) and whether one can glaze the pots after drying and before firing. A week ago I was writing to the email address of Randy Brodnax, but, alas, didn't get an answer. Maybe he's out of town.
Anybody?

Thanks in advance and greetings from Switzerland

Evelyne


I want to say the same as Marcia. I went to a friends studio and he used sodium silicate to make the cracks and he appears to fire in his electric kiln as he would any pot. I have done a couple of pots this way but as of yet have not fired them but I never expected that they would need to be fired any other way that what the clay body type I have dictates.



#5 acg

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Posted 28 April 2012 - 10:10 AM

Sodium Silicate has been used a lot in our community studio. ^10 gas-redution, raku fired, ^9 salt-fired, ^6 oxidation. Just match clay body to temp.

#6 Bill T.

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Posted 28 April 2012 - 12:24 PM

I have seen Randy do this several times at the Texas Clay Festival. He uses a homebuilt Raku kiln and treats the ware like you would raku. He sometimes sprays and sometimes uses horse hair. Very impressive treatment to the pot. Not really sure of the clay, but I know he likes Soldate a Laguna Clay high fire.

#7 Evelyne Schoenmann

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Posted 29 April 2012 - 07:06 AM

Thank you very much Marcia, Meisie, acg and giltex58 for your replies regarding the sodium silicate firing. I saw Randy doing the firing in the Raku kiln on the DVD, but I don't know whether you can put an object cracked with the Sodium Silicate also in a pit with direct fire. I'll give it a try in May, when I will do my next pit fire. The clay I use is a high fire clay (refractory).
Happy Sunday to you all!
Evelyne

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Studio: schoenmann ceramics
In love with alternative firing methods
www.schoenmann-ceramics.ch


#8 Mouten Keramik

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Posted 25 November 2014 - 03:38 AM

I know this is an old thread, but it matches my needs, so I hope it's ok to revive it.

 

I use the facilities of a community studio, and therefore have to be careful of not ruining "everybody's good time". I know that salt firing is damaging to the kiln, but what about sodium silicate? Does it leave residue in the kiln during bisque firing?

 

Thanks in advance.



#9 bciskepottery

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Posted 25 November 2014 - 07:11 AM

The amount of sodium silicate you are using would not cause any damage to the kiln elements. Any residue that accumulates on the elements would burn off in the next firing. Most of the sodium is likely burned off when you are heating the sodium silicate solution with a propane torch or heat gun before you stretch out the form.

#10 JBaymore

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Posted 25 November 2014 - 10:22 AM

Fire it in anything you want.... no issues.

 

The clay that has a lot of sodium silicate on it can cause issues in the RECLAIM department.  If I screw it up (rarely anymore) .... I just discard that clay.

 

best,

 

....................john


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#11 drmyrtle

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Posted 25 November 2014 - 10:30 AM

?..it can cause issues in the RECLAIM department.



What happens to the reclaim?

#12 Diesel Clay

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Posted 25 November 2014 - 11:53 AM

It deflocculates. Which is good if you want casting slip, but a pain if you're trying to hand build or throw with it.
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#13 Mouten Keramik

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Posted 26 November 2014 - 09:58 AM

Thanks for all the responses - I guess I'm off to the chemist for some Sodium Silicate.






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