Brad Sondahl on sat 15 jul 06
Mel's mention of Advancer shelves has prompted me to post this query:
Recently they've been advertising that they have the 10 sided shelves to
fit electric kilns, also that they resist glaze and don't need
flipping. If true, this would make their presumably high price worth
it, particularly since they are about half the weight of cordierite
shelves, and less mass (weight) means faster firing in electric kilns.
The conventional wisdom on Silicon Carbide shelves is they're only good
in reduction, or they deteriorate. (Silicon Carbide is even sometimes
used as a local reduction agent in ox. firing.)
So I'm wondering if anyone on the group has used them for high fire
oxidation for a long period, and if all their claims are true.
Particularly I'm interested in the claim that glazes don't tend to
stick. I fire about 1/4 crystalline, and although I mostly control
running through careful application, there are inevitably some drips
onto the shelf. With cordierite and kiln wash, I can chip off and grind
off the drips and re kilnwash. When chipping, it sometimes takes a
chunk of shelf with it. With the thinner shelves, this might be a
serious problem--cracking the shelf or making a hole clean through it...
Thanks for your thoughts...
Brad Sondahl
--
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http://sondahl.com
Hank Murrow on sun 16 jul 06
On Jul 16, 2006, at 8:20 AM, Brad Sondahl wrote:
> Mel's mention of Advancer shelves has prompted me to post this query:
>
> So I'm wondering if anyone on the group has used them for high fire
> oxidation for a long period.
Brad; I have used them in gas cone 10+ oxidation and reduction firings.
They seem to hold up better than any I had used before. Mine are 14" x
28" size, individually setting on lugged posting.
> Particularly I'm interested in the claim that glazes don't tend to
> stick.
As to glaze sticking.....a light tap with a sharp chisel pops glaze
off. No SiC comes along with it. They are just so very non-porous.
Cheers, Hank
www.murrow.biz/hank
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