[Clayart] Glaze SG question

Sharon Wetherby via Clayart clayart at lists.clayartworld.com
Fri Feb 27 12:01:58 EST 2015


I took a workshop in Houston some years ago with Malcolm Davis.  He told us
that he bisque-fired his porcelain to cone 010.  Don't remember if he
bisque'd to this temperature on all his work or just for his shinos.

Cheers,
Sharon Wetherby
in Fort Worth where it's snowing!

On Fri, Feb 27, 2015 at 8:09 AM, Eva Gallagher via Clayart <
clayart at lists.clayartworld.com> wrote:

> Hi Taylor - what about a lower bisque - 08 to 06 - not sure why you are
> doing 04 especiallly for porcelain that usually does not have organics to
> burn out.
> Eva Gallagher
> Deep River,Ontario
> http://newfoundoutpotter.blogspot.com/
>
> ----- Original Message ----- From: "Taylor Hendrix via Clayart" <
> clayart at lists.clayartworld.com>
> To: "Clayart posting" <clayart at lists.clayartworld.com>
> Sent: Thursday, February 26, 2015 9:48 PM
> Subject: [Clayart] Glaze SG question
>
>
>  I've a question for the hive mind. First I will state the knowns which
>> will, hopefully, circumscribe a limited area for useful conjecture. Yea,
>> right.
>>
>> I have several ^6 glazes in the Art Center's clay studio that have SG of
>> 1.14 to 1.23 as measured by me with a scale. They appear to be good for
>> dipping.
>>
>> I have a clay body (^6 porcelain from Armadillo Clay in TX) which is being
>> dipped in the glazes.
>>
>> I bisque student pots to cone 04, cones bend properly.
>>
>> Student pieces do have variable wall thickness from rim to foot expected
>> of
>> beginner to intermediate throwers. Some pieces quite on the thin side,
>> some
>> much thicker.
>>
>> Several of the glazes are NOT drying on the bisque ware with sufficient
>> rapidity to prevent entire sections of glaze to continue reacting to
>> gravity once the item has been righted and placed on the table, tongues
>> removed. Many of the pieces remain wet to the touch for many minutes.
>> These
>> are not errant drips, but rather entire surfaces that flow down the form.
>>
>> I believe that these glazes have not only too much water but also have
>> ingredients that make them behave as if they were thick enough for
>> dipping.
>> Where the cross section of bisque is insufficient to contain the moisture
>> of the applied raw glaze, we see the glaze remaining fluid on the bisque
>> for several minutes.
>>
>> I may or may not be able to confirm that Gerstly B. is one of the
>> ingredients in many or all of these glazes or if a particular glaze has a
>> preponderance of frit.
>>
>> -->  Question: Is SG of 1.14 a workable number for ANY type of ^6 glaze
>> which one applies by dipping, or is my suspicion that the glaze is soupy
>> correct?
>>
>> I have been adjusting my own personal glaze to SG 1.43 for quick dipping,
>> so I have no current experience with such low SG numbers in my home
>> studio.
>>
>> As a side note: I can't confirm this, but one student noticed that
>> different clay bodies had different results to the same glaze dipped. Some
>> dried just fine, some took a longer time to dry.
>>
>> Thanks for helping me confirm or deny my suspicions.
>>
>>
>> Taylor, in Rockport TX
>> wirerabbit1 on Skype (-0600 UTC)
>> http://wirerabbit.blogspot.com
>> http://wirerabbitpots.blogspot.com
>> http://www.flickr.com/photos/wirerabbit/
>> https://youtube.com/thewirerabbit
>> MAILMAN_MIMEDEFANG WRAP
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>>
>>
> MAILMAN_MIMEDEFANG WRAP
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