[Clayart] ron roy, fast bisque

Robert Harris robertgharris at gmail.com
Fri Apr 13 14:34:07 EDT 2018

I more or less do this. I generally fire to about cone 08/07 or so for my
bisque (porcelain mostly). After going up to 500 at about 200F/hr (after a
lengthy hold at 230 to make sure all water is eliminated), I go to 1730 at
300F/hr then I hold for 30 minutes. I admit I've never bothered to put
witness cones in but even when I use "dirty" clay this program seems to
work very well. Of course a vent is a must too, need to get enough oxygen
in to burn everything out.

On Fri, Apr 13, 2018 at 12:14 PM, mel jacobson <melpots at visi.com> wrote:

> ron mentioned to me at nceca that is seems that the
> critical time for burn out of gases and crap from bisque
> firing was during the final few hundred degrees of reaching
> bisque temperature.
> if that is the case...why not fire a bit faster, sort of as
> fast as the clay will allow without blowing up, or cracking
> and then down firing for an hour at just below bisque temp.
> ????
> it seems that in my experiments with my new clay body
> that it is pretty tough.  i have had no blowups yet, and i am
> moving right along.  ( pin holing has not been serious)
> i am just trying to test this body with everything there is
> to test...why not faster bisque firing...and save some money
> in the process.  those long holds at low temp maybe are
> not necessary...i am changing my tune.  (of course i am singing
> along with diana krall and that makes me happy..)
> would love ideas from all.
> mel
> --
> Mel's Website:  www.melpots.com
> http://www.melpots.com/CLAYART.HTML
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