Steve Slatin on mon 13 mar 06
John --
You're right about the melters, but there's
a problem with the rule of thumb as you
present it -- frit 3124 is itself about
23% fluxes (melters), but nepheline syenite
only 15%.
Feldspars are about 10-13%. Really high
melter-content frits run maybe around
30% ... if your melter is 3110, you need only
about half as much as if you use feldspar, and so
on.
Steve Slatin
--- John Britt wrote:
> This has 25% flux (Nepehline syenite and frit
> 3124), with 50 % clay and 25
> % filler (silica).
>
> I am sure others have nice slips for cone 6.
>
> Let me know if no one else posts.
Steve Slatin --
In the mornin’ cry of the rooster
The baby lay alone
And the old cow in the green grass
Shed white tears in the red hot sun
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Robert Cope on mon 13 mar 06
Hello, I am currently using Hopper slip (Ball clay 75% Kaolin 10% Silica
10% Feldspar 5%) at Cone 6 on the outside bottom 1/3 of mugs (the inside
and upper outside 2/3 is glazed). I do some brush work on that slipped
part.
In use, the slipped part will absorb oils (although coffee or tea stains
wash out). Does anyone have a slip that is perhaps more impervious or
fires with a smoother surface at Cone 6 but with similar workability while
raw? (I tried terra sigillata but it doesn=92t accept the brushwork very
well.) Thanks for your help!
Bob Cope
Madisonville, TX
John Rodgers on mon 13 mar 06
If your slip is a true cone 6, and it's composition correct, it should=20
vitrify at cone 6 and not absorb any liquids or what have you when in=20
use or otherwise. If it is doingthe latter, then you have some clay body=20
composition problems.
Regards.
John Rodgers
Chelsea, AL
Robert Cope wrote:
>Hello, I am currently using Hopper slip (Ball clay 75% Kaolin 10% Silica
>10% Feldspar 5%) at Cone 6 on the outside bottom 1/3 of mugs (the inside
>and upper outside 2/3 is glazed). I do some brush work on that slipped
>part.
>
>In use, the slipped part will absorb oils (although coffee or tea stains
>wash out). Does anyone have a slip that is perhaps more impervious or
>fires with a smoother surface at Cone 6 but with similar workability whi=
le
>raw? (I tried terra sigillata but it doesn=92t accept the brushwork very
>well.) Thanks for your help!
>
>Bob Cope
>Madisonville, TX
>
>________________________________________________________________________=
______
>Send postings to clayart@lsv.ceramics.org
>
>You may look at the archives for the list or change your subscription
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>
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nk.com.
>
>
> =20
>
John Britt on mon 13 mar 06
Bob,
Your slip is a cone 9 /10 slip.
You need more flux for cone 6.
Here is a sample:
WHITE SLIP CONE 6
Nepheline Syenite 15.00
Kentucky Ball Clay 25.00
EPK Kaolin 25.00
Ferro 3124 10.00
Silica 25.00
This has 25% flux (Nepehline syenite and frit 3124), with 50 % clay and 25
% filler (silica).
I am sure others have nice slips for cone 6.
Let me know if no one else posts.
Hope it helps,
John Britt
www.johnbrittpottery.com
louroess2210 on mon 13 mar 06
On Mar 13, 2006, at 5:46 PM, John Britt wrote:
>
> You need more flux for cone 6.
>
> Here is a sample:
John, I'd like to try this slip. Is it for greenware, leather hard
or bisque. I gather there are differences.
Thanks, Lou in Colorado
Anne Wellings on tue 14 mar 06
On Mon, 13 Mar 2006 19:51:41 -0700, louroess2210
wrote:
>On Mar 13, 2006, at 5:46 PM, John Britt wrote:
>
>>
>> You need more flux for cone 6.
>>
>> Here is a sample:
>
>
>John, I'd like to try this slip. Is it for greenware, leather hard
>or bisque. I gather there are differences.
>Thanks, Lou in Colorado
Another good one is Bringle's ^6 Wet, Dry, Bisque Slip, which can be found
in the archives. I have used it and it gives vibrant colors and a smooth
surface without glaze, and with some colorants a bit of a sheen. There's
also a ^10 version.
Anne
Anne
John Britt on tue 14 mar 06
Lou,
It could go on leather hard or bisque. It depends on how thick you apply
it. It has 50% clay so that is not that high for a slip. Some slips have
100% clay. They are usually for leather hard ware but if applied very thin
they can go on bisque.
All they did was to take a slip recipe: clay 50%, silica 25% and Custer
feldspar 25% recipe, and substitute a lower melting flux for the Custer
feldspar. So they could have used just 25% nepheline syenite but they
wanted it to melt more so they divided it to 15% nepheline syenite and 10%
frit.
Just look at the amount of clay, flux and filler.
Hope it helps,
John Britt
www.johnbrittpottery.com
louroess2210 on tue 14 mar 06
On Mar 14, 2006, at 1:34 AM, Anne Wellings wrote:
> Another good one is Bringle's ^6 Wet, Dry, Bisque Slip, which can
> be found
> in the archives. I have used it and it gives vibrant colors and a
> smooth
> surface without glaze, and with some colorants a bit of a sheen.
> There's
> also a ^10 version.
>
> Anne
Anne, can you tell me which ball clay you use? I gather that
sometimes they can be used interchangeably and sometimes not.
Thanks, Lou in Colorado
Anne Wellings on wed 15 mar 06
On Tue, 14 Mar 2006 11:41:21 -0700, louroess2210
wrote:
>Anne, can you tell me which ball clay you use? I gather that
>sometimes they can be used interchangeably and sometimes not.
>Thanks, Lou in Colorado
I use OM4 Ball Clay. I don't know much about ball clays, that's just the
one that I'm most familiar with and which I have on hand. I don't remember
whether Bringle calls for a specific type in her recipe for ^6 slip as
posted in the archives.
Anne
Eleanora Eden on thu 16 mar 06
Anne,
I looked it up when you mentioned it and the recipe I found did not
indicate any particular ball clay.
Eleanora
>On Tue, 14 Mar 2006 11:41:21 -0700, louroess2210
>wrote:
>
>>Anne, can you tell me which ball clay you use? I gather that
>>sometimes they can be used interchangeably and sometimes not.
>>Thanks, Lou in Colorado
>
>I use OM4 Ball Clay. I don't know much about ball clays, that's just the
>one that I'm most familiar with and which I have on hand. I don't remember
>whether Bringle calls for a specific type in her recipe for ^6 slip as
>posted in the archives.
>
>Anne
>
>______________________________________________________________________________
>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.
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