Will Duderstadt on fri 31 mar 06
Hi BJ
I spoke with Tom, our Ceramic Engineer, and here is the verdict:
Visually, you'll notice the salt solution will make the cones shiny
and they will look glazed. They are still able to bend as expected,
the salt does not normally make them do strange things.
However, there is one concern to be aware of. Depending on the way
the salt is added, it can cause the temperature of the kiln to
suddenly decrease. (It is like throwing water onto a hot fire.) This
sudden decrease in temperature can create a hard shell casing on the
cone. This casing can freeze the cone in place and delay the bending
action of the cone. This "hard shelling" will become more prominent
if the temperature decrease is followed by a rise in temperature that
is not uniform. If the kiln cycles on and off and fluctuates the
temperature instead of gradually rising, it will create a thicker
shell on the cone.
So at the end of the day, as long as the salt is added all at once,
the temperature decrease is not too drastic, and the temperature
recovers gradually, then the cones will work just fine.
Also, the iron bearing cones (cone 010 through cone 3) are more
susceptible to hard shelling because of the presence of iron oxide.
I hope this helps!
Best Regards,
Will Duderstadt
Marketing Coordinator
The Edward Orton Jr. Ceramic Foundation
http://www.ortonceramic.com
(614) 818-1341
On Mar 29, 2006, at 11:25 PM, BJ Clark | Stinking Desert Ceramics wrote:
> Will (or other Orton people),
> Could you please give us the official word on what salting orton
> cones does
> to their accuracy?
> I posted about this years ago, long before you were monitoring the
> list, and
> had a mixed answer but most people say the cones are stable even
> after being
> salted.
Snail Scott on fri 31 mar 06
At 10:40 AM 3/31/2006 -0500, you wrote:
>...This casing can freeze the cone in place and delay the bending
>action of the cone...
>Also, the iron bearing cones (cone 010 through cone 3) are more
>susceptible to hard shelling because of the presence of iron oxide.
Ha! So that's what causes that!
-Snail
BJ Clark | Stinking Desert Ceramics on sat 1 apr 06
Will,
Thanks for the official reply. There has been lots of discussion on this i=
n
the past and now that you are on the list I just thought it would be nice t=
o
get the final word on it.
Thanks for the info and the great product!
BJ Clark
On 3/31/06, Will Duderstadt wrote:
>
> Hi BJ
>
> I spoke with Tom, our Ceramic Engineer, and here is the verdict:
>
> Visually, you'll notice the salt solution will make the cones shiny
> and they will look glazed. They are still able to bend as expected,
> the salt does not normally make them do strange things.
>
> However, there is one concern to be aware of. Depending on the way
> the salt is added, it can cause the temperature of the kiln to
> suddenly decrease. (It is like throwing water onto a hot fire.) This
> sudden decrease in temperature can create a hard shell casing on the
> cone. This casing can freeze the cone in place and delay the bending
> action of the cone. This "hard shelling" will become more prominent
> if the temperature decrease is followed by a rise in temperature that
> is not uniform. If the kiln cycles on and off and fluctuates the
> temperature instead of gradually rising, it will create a thicker
> shell on the cone.
>
> So at the end of the day, as long as the salt is added all at once,
> the temperature decrease is not too drastic, and the temperature
> recovers gradually, then the cones will work just fine.
>
> Also, the iron bearing cones (cone 010 through cone 3) are more
> susceptible to hard shelling because of the presence of iron oxide.
>
>
>
> I hope this helps!
>
>
> Best Regards,
>
> Will Duderstadt
> Marketing Coordinator
>
> The Edward Orton Jr. Ceramic Foundation
> http://www.ortonceramic.com
> (614) 818-1341
>
>
> On Mar 29, 2006, at 11:25 PM, BJ Clark | Stinking Desert Ceramics wrote:
>
> > Will (or other Orton people),
> > Could you please give us the official word on what salting orton
> > cones does
> > to their accuracy?
> > I posted about this years ago, long before you were monitoring the
> > list, and
> > had a mixed answer but most people say the cones are stable even
> > after being
> > salted.
>
>
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--
BJ Clark
Stinking Desert Ceramics
bjclark@stinkingdesert.com
www.stinkingdesert.com
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