joyce on fri 16 nov 07
>That has not been my experience - I work for a clay company and when we mix
>paper clay versions of 04,6 and cone 10 versions there is not extra
>fluxing. Perhaps it depends on the type of paper. If the body has iron in
>it and the ware is not foired slow enough in the presence of extra oxygen -
>the iron can be reduced and act as a flux.
>
>Are you once firing? How fast do you fire after red heat to the end?
>
>RR
>
> >We are firing some work for a potter in our neighborhood who uses paper clay
> >make with ^10 clay. When we fire this work it gets very soft and looks like
> >it dropped down to a ^9 or lower clay. Is this to be expected? This work is
> >also very flat so it does not have a lot of shape to help keep it from
> >moving. It does not stick to the shelf but we can't wad it without making
> >dents were the clay sags down to the shelf. Any ideas what is going on?
> >
> >Dan & Laurel
>
>Ron Roy
>RR#4
>15084 Little Lake Road
>Brighton, Ontario
>Canada
>K0K 1H0
Pfeiffer Fire Arts on sat 17 nov 07
We glaze fire at about 300 to 400/hr up to about 1150c were the kiln slows
and takes about an hour or two to get to 1250C and ^10. We then turned the
gas off and close it up. So far we have only done this with bisque ware but
will fire a load this week that is once fired and see how it works. The base
clay is a highwater white oven clay that we use for all our work and
without the paper have never had this happen even in a much reduced firing
and as high as ^12. We were a bit shocked to see just how soft it turned
out. The work was very thin and flat which may not have helped.
Dan & Laurel
>
>Are you once firing? How fast do you fire after red heat to the end?
>
>RR
____________________________________________________________________________
__
| |
|
