Frank Colson on thu 6 sep 07
Eric- When I worked with Soldner the clay formula was more simplfied:
50 parts Ky Ball
50 parts Fire Clay
Add 15% 30 mesh clean silica sand (no grog).
This is my clay body today. Thrown 1000,s of pots and hand built large pcs
over the yrs. Always failsafe!
Frank Colson
----- Original Message -----
From: "Eric Suchman"
To:
Sent: Thursday, September 06, 2007 6:14 PM
Subject: Soldner body
> The Soldner clay body is :
> 25 ball clay
> 25 epk / redart
> 25 fire clay
> 25 silica
>
> Does any remember if the this recipe is by parts or percent?
>
> Thanks,
> Eric in Oceanside
>
> ______________________________________________________________________________
> Send postings to clayart@lsv.ceramics.org
>
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> settings from http://www.ceramics.org/clayart/
>
> Moderator of the list is Mel Jacobson who may be reached at
> melpots2@visi.com
Eric Suchman on thu 6 sep 07
The Soldner clay body is :
25 ball clay
25 epk / redart
25 fire clay
25 silica
Does any remember if the this recipe is by parts or percent?
Thanks,
Eric in Oceanside
Jon Pacini on fri 7 sep 07
Greetings All ---Hi Eric
Eric wrote--
-The Soldner clay body is :
25 ball clay
25 epk / redart
25 fire clay
25 silica
Does any remember if the this recipe is by parts or percent?
When I make clay for Paul to do workshops here in the LA area the formula he
uses is:
2 parts fireclay
1 part ball clay
1 part 30 sand
all by weight.
When he's in Florida and T Robert at Axner's makes his clay he gets:
equal parts fireclay, ball clay and sand by weight.
I'd have to say your formula would be by percentage/weight also.
just a side note ---Paul also prefers not to have his clay pugged or
deaired.
Best regards,
Jon Pacini
Clay Manager
Laguna Clay Co
Eric Suchman on fri 7 sep 07
I bumped up the fire clay and added some alumina hydrate to use as a
refractory body for a thrown flu ring in a fiber top kiln. Any
problem with that?
My actual recipe is:
EPK 2.5 lbs
Ball Clay 2.5 lbs
Lincoln Fire clay 2.0 lbs
Silica 1.5 lbs
Alumina hydrate . 25 lbs
Sawdust as needed for airspace 2-3 cups
Thanks,
Eric in Oceanside
On Sep 7, 2007, at 2:46 PM, Ron Roy wrote:
> This is a raku body by the way - if you wanted to see a clay body
> with a
> lot of cristobalite - fire it up to cone 10.
>
> RR
>
>> The Soldner clay body is :
>> 25 ball clay
>> 25 epk / redart
>> 25 fire clay
>> 25 silica
>>
>> Does any remember if the this recipe is by parts or percent?
>>
>> Thanks,
>> Eric in Oceanside
>
> Ron Roy
> RR#4
> 15084 Little Lake Road
> Brighton, Ontario
> Canada
> K0K 1H0
>
> ______________________________________________________________________
> ________
> 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
> melpots2@visi.com
WJ Seidl on fri 7 sep 07
Eric:
In a case where all the (ingredients) elements are equal (such as this)
that's a rhetorical question. .
Ist macht nicht! (It doesn't matter.)
Best,
Wayne Seidl
Eric Suchman wrote:
> The Soldner clay body is :
> 25 ball clay
> 25 epk / redart
> 25 fire clay
> 25 silica
>
> Does any remember if the this recipe is by parts or percent?
>
> Thanks,
> Eric in Oceanside
>
> ______________________________________________________________________________
>
> 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
> melpots2@visi.com
>
Ric Swenson on fri 7 sep 07
Does it matter? I could be for ounces or grams or tons or pounds or percen=
t...it will equal 100 of something...right?
=20
Ric
=20
> The Soldner clay body is :> 25 ball clay> 25 epk / redart> 25 fire clay> =
25 silica> > Does any remember if the this recipe is by parts or percent?> =
> Thanks,> Eric in Oceanside> > ___________________________________________=
___________________________________> Send postings to clayart@lsv.ceramics.=
org> > You may look at the archives for the list or change your subscriptio=
n> settings from http://www.ceramics.org/clayart/> > Moderator of the list =
is Mel Jacobson who may be reached at melpots2@visi.com
_________________________________________________________________
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Ron Roy on fri 7 sep 07
This is a raku body by the way - if you wanted to see a clay body with a
lot of cristobalite - fire it up to cone 10.
RR
>The Soldner clay body is :
>25 ball clay
>25 epk / redart
>25 fire clay
>25 silica
>
>Does any remember if the this recipe is by parts or percent?
>
>Thanks,
> Eric in Oceanside
Ron Roy
RR#4
15084 Little Lake Road
Brighton, Ontario
Canada
K0K 1H0
Maurice Weitman on sat 8 sep 07
At 02:53 -0400 on 9/7/07, Ric Swenson wrote:
>Does it matter? I could be for ounces or grams or tons or pounds or
>percent...it will equal 100 of something...right?
Uhhh... I'd say not right, even though it's correct mathematically
that 4x25 anything = 100 that thing.
The outcome of a glaze formula can be much different if the
ingredients are measured by weight rather than volume. Perhaps for
clay bodies it's less critical than in a glaze, but still...
A material that's more dense than another in a formula will be more
prevalent if the formula is measured by volume but meant to be
mesaured by weight.
Volume (Mel's coffee can method) will certainly work if the formula
is meant to be expressed that way, but they are not interchangeable.
Most glaze formulas are represented in weight measures (grams,
pounds, whatever), even when they're expressed as percentages; it's
still 25% of a (say) 2000 gram batch.
That's my take.
And I mean that sincerely.
Regards,
Maurice
Josh Berkus on sat 8 sep 07
Jon,
> just a side note ---Paul also prefers not to have his clay pugged or
> deaired.
No, he prefers to have his students wedge it in big 50lbs blobs. I was never
so muscular as when I studied with Paul ... ;-)
--
The Fuzzy Chef
San Francisco
Ivor and Olive Lewis on sun 9 sep 07
Dear Eric Suchman,=20
Your recipe :-
EPK 2.5 lbs
Ball Clay 2.5 lbs
Lincoln Fire clay 2.0 lbs
Silica 1.5 lbs
Alumina hydrate . 25 lbs
First, I think that proportion of ball clay may lead to high drying =
shrinkage.
Second if this support goes through thermal cycling from room =
temperature to higher than about 500 deg C it is possible that the =
quartz phase change my cause it to break. It might be an advantage to =
replace Silica with Sillimanite, Mullite, Kyanite or Pyrophyllite.
Best regards,
Ivor Lewis.
Redhill,
South Australia.
Ron Roy on mon 10 sep 07
Hi Eric,
I'd drop the silica - even so there will be lots of cristobalite build up
over many firings - and I don't know how to avoid it with clay in the
recipe. Cracking will be the eventual result.
I have measured a sample of Lincoln clay and there was a huge amount of
cristobalite in it after cone 10.
Perhaps you should be looking at come castable!
RR
>I bumped up the fire clay and added some alumina hydrate to use as a
>refractory body for a thrown flu ring in a fiber top kiln. Any
>problem with that?
>My actual recipe is:
> EPK 2.5 lbs
> Ball Clay 2.5 lbs
> Lincoln Fire clay 2.0 lbs
> Silica 1.5 lbs
> Alumina hydrate . 25 lbs
>
> Sawdust as needed for airspace 2-3 cups
>
> Thanks,
> Eric in Oceanside
>
>
>On Sep 7, 2007, at 2:46 PM, Ron Roy wrote:
>
>> This is a raku body by the way - if you wanted to see a clay body
>> with a
>> lot of cristobalite - fire it up to cone 10.
>>
>> RR
Ron Roy
RR#4
15084 Little Lake Road
Brighton, Ontario
Canada
K0K 1H0
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