David Beumee on fri 13 jul 12
I've been creating some white stoneware and darker firing cone 6 clay
bodies for a friend
using Ron and John's five low to high expansion glazes from MC6G
to test the bodies against, to make sure they fit a wide variety of glazes.
A pattern is being established where I can get low through medium expansion
glazes
in Ron and John's series to fit, numbers 1 - 3, but can't the high
expansion glazes in the series,
numbers 4 & 5, to fit without crazing. I don't how important it is to make
a body that fits all five glazes.
Is it enough that a cone 6 body fits 1 - 3, or do I need to find ways to
further increase
the expansion of these bodies to fit all five?
David Beumee
Lafayette, CO
ronroy@CA.INTER.NET on mon 16 jul 12
Hi David,
Glazes that fit the medium and medium low would be fairly normal -
that really is all you can ask of a glaze. I would caution you that
using a glaze with an expansion as low as our lowest could be asking
for trouble on most clay bodies that potters use.
You might try just glazing the inside of some cups with that glaze and
then freezing them to see if that glaze cracks them.
Keep looking at those tests - you may still find some will craze
eventually - especially the medium (#3) and particularly if the clay
can absorb any water.
In case I have not been clear - it would be impossible to create a
clay body that would fit all five of those glazes.
RR
Quoting David Beumee :
> I've been creating some white stoneware and darker firing cone 6 clay
> bodies for a friend
> using Ron and John's five low to high expansion glazes from MC6G
> to test the bodies against, to make sure they fit a wide variety of glaze=
s.
> A pattern is being established where I can get low through medium expansi=
on
> glazes
> in Ron and John's series to fit, numbers 1 - 3, but can't the high
> expansion glazes in the series,
> numbers 4 & 5, to fit without crazing. I don't how important it is to mak=
e
> a body that fits all five glazes.
> Is it enough that a cone 6 body fits 1 - 3, or do I need to find ways to
> further increase
> the expansion of these bodies to fit all five?
>
> David Beumee
> Lafayette, CO
>
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