[Clayart] old cones

Robert Harris robertgharris at gmail.com
Fri Sep 24 20:26:54 UTC 2021

I would recommend a zircopax wash for this. We use an expensive, but very
useful one that is 40g Zircopax to 10g Glomax (calcined kaolin).

Orton claim they have 50 year old cones that they have tested and are
absolutely fine. Of course I'm sure they keep them indoors somewhere that
is more or less climate controlled. If you keep them in a damp or humid (or
worse cycling between the two) shed for 20 years, then I imagine all bets
are off.

On Fri, 24 Sept 2021 at 12:36, mel jacobson <melpots at mail.com> wrote:

> We have been experiencing some sticky cones and some
> over fires on one electric kiln.  I will probably
> exchange the entire norton kiln sitter...I have all
> new parts...But, one of our vendors asked colleen.."are your
> cones really old?"  yes, like 25 year old boxes.
> Arnold and I have no reason to believe cones can get old.
> It seems to be getting crazy.  Arnold likes to advise folks
> to keep a small bottle with thick kiln wash to dab on the
> cone holders.  I have used itc in the past. but, not on this
> kiln.
> I know, I know...what is the recipe for kiln wash for
> this sort of application.  ?
> what have veteran potters experienced with this issue.?
> (colleen is now using a new box of cone 08 bars, and she
> is experiencing kiln firing fear.)
> We had the cone packs blow up in the baby stoneware and
> i fired it with two pyrometers and color.  hit cone 11 perfect.
> Had one pyrometer stick at 1900...threw that one out...hit it with
> a brick.
> I am sick of this issue.
> Mel
> website: www.melpots.com
> www.melpots.com/CLAYART.HTML
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