L. Deane on fri 25 jul 97
recently I have been bisque firing a low-fire red to ^03. I bisque slow ,
200^ an hour. cups and small bowls do not warp.but all of my low platters,
large plates, ( anything with a wide rim,) etc seem to be warping so badly
that the rims almost slump to the kiln shelf. I'm using a commercial red clay
" stan's red " from Highwater. Its always been great. Any suggestions?
Thanks Laurie
Dannon Rhudy on sat 26 jul 97
Laurie,
Well, if it has not happened before, then: something wrong with
this batch of clay, or something wrong with your kiln or cones.
Sure sounds like it is getting too hot.
Dannon Rhudy
----------------------------Original
message----------------------------
recently I have been bisque firing a low-fire red to ^03. I
bisque slow ,
200^ an hour. cups and small bowls do not warp.but all of my low
platters,
large plates, ( anything with a wide rim,) etc seem to be warping
so badly
that the rims almost slump to the kiln shelf. I'm using a
commercial red clay
" stan's red " from Highwater. Its always been great. Any
suggestions?
Thanks Laurie
Tony Hansen on sun 27 jul 97
----------------------------Original message----------------------------
> recently I have been bisque firing a low-fire red to ^03. I bisque slow ,
> 200^ an hour. cups and small bowls do not warp.but all of my low platters,
> large plates, ( anything with a wide rim,) etc seem to be warping so badly
> that the rims almost slump to the kiln shelf.
Our customers have had this also. It is easy to assume that because low
fire
ware looks non-vitreous that it is very stable in the kiln and that very
overhung and extreme shapes are fine. However this is not so. Often a
modification of the shape to one that is inherently more stable is all
that is needed. These red bodies are volatile and do not have a linear
maturation. They fail quickly over a narrow temperature range and cone
03-02
may be approaching that range for this body.
--
T o n y H a n s e n, I M C thansen@digitalfire.com
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INSIGHT5/Magic of Fire II demos at http://digitalfire.com
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