William & Susan Schran User on tue 19 oct 10
On 10/19/10 4:04 PM, "jonathan byler" wrote:
> But raku glazes that made it into the ^10 firing are another story.
> as are a few of the double-dip combinations people have been coming up
> with while I am not watching. these runs soak deep into the shelf and
> need grinding back with the angle grinder. even after the surface is
> ground down, the glaze still leaches out of the shelf during firings
> and messes up the bottom of pots that are placed on them. is there
> something I can put on these runs to draw them out of the shelf? or
> am I going to have to suck it up and use a kiln wash on these?
Gee, never tried raku glazes in a ^10 firing...
These shelves have nearly the same absorption rate as oxide bonded shelves
and if you really melt stuff on them you discovered what happened.
I'd suggest trying just flipping the shelf, putting the glazed side down an=
d
grinding off whatever comes out after each firing.
If you do apply kiln wash, I think the glaze will simply adhere it to the
shelf and leach up through the wash.
> what are people using for wash on these shelves at ^10? same as for
> corderite shelves? the nice part about these shelves has been the
> swift cleanup and the fact that I don't need the klin wash...
I've been using 50/50 by volume alumina and EPK on our Corelites.
We use Advancers, but have some other shelves from when I did a long series
of testing. The cheaper nitride bonded shelf is still holding up well
> any thoughts other than the obvious (keeping raku ware away from ^10
> kiln)?
Yeah, students often aren't aware of differences in glazes, even after you
tell them. I decided years ago to do stoneware during fall & spring
semesters, then raku ONLY during summer semester. Ours is a small studio an=
d
it just works best to keep processes separated by sessions.
Bill
--
William "Bill" Schran
wschran@cox.net
wschran@nvcc.edu
http://www.creativecreekartisans.com
jonathan byler on tue 19 oct 10
We have had a couple of catastrophic glaze runs on the larkin Nitride
bonded silicon carbide shelves recently. depending on the glaze,
normally all you need is to touch up with a SiC rub brick and the
glaze comes right off. looks all bubbly and foamy under where the
glaze drips are and that rubs off and there is no problem.
But raku glazes that made it into the ^10 firing are another story.
as are a few of the double-dip combinations people have been coming up
with while I am not watching. these runs soak deep into the shelf and
need grinding back with the angle grinder. even after the surface is
ground down, the glaze still leaches out of the shelf during firings
and messes up the bottom of pots that are placed on them. is there
something I can put on these runs to draw them out of the shelf? or
am I going to have to suck it up and use a kiln wash on these?
what are people using for wash on these shelves at ^10? same as for
corderite shelves? the nice part about these shelves has been the
swift cleanup and the fact that I don't need the klin wash...
any thoughts other than the obvious (keeping raku ware away from ^10
kiln)?
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