Laura on sun 25 apr 10
> Hi! So in the middle of our move this winter there was a 6 week period
> when
> all my pottery supplies, equipment lived in my mother in laws unheated
> garage, and inevitably the buckets of glaze froze. I asked some fellow
> potters and was told that the glazes should be fine just resieve them. S=
o
> I
> did that however they are not firing the same. I am trying to figure out
> if
> it is my electrical supply (as this house now has 200 Amp vs the 100 Amp
> service I had at the last house when the kiln seemed to take forever to
> reach temperature) Anyhow the couple I am having the biggest problem are
> from the Mastering Cone 6 glaze book. They are no longer getting the
> crystalization/ semi matt that I am used to and I ran the same program th=
e
> same as I had before the move, however the firing has taken less time at
> the
> new house dispite the same program, however the taking less time is on th=
e
> up ramp.
>
> I may just have to make up a couple test batches to see if a new glaze
> makes
> the difference or if it is going to be me playing around with the
> controller. I just thought I would ask if there is something that happen=
s
> to a glaze when it freezes that would cause this.
>
> Thanks
>
> Laura
>
William & Susan Schran User on sun 25 apr 10
On 4/25/10 9:00 AM, "Laura" wrote:
>> Hi! So in the middle of our move this winter there was a 6 week period
>> when all my pottery supplies, equipment lived in my mother in laws unhea=
ted
>> garage, and inevitably the buckets of glaze froze. I asked some fellow
>> potters and was told that the glazes should be fine just resieve them. =
So
>> I did that however they are not firing the same. I am trying to figure =
out
>> if it is my electrical supply (as this house now has 200 Amp vs the 100 =
Amp
>> service I had at the last house when the kiln seemed to take forever to
>> reach temperature) Anyhow the couple I am having the biggest problem are
>> from the Mastering Cone 6 glaze book. They are no longer getting the
>> crystalization/ semi matt that I am used to and I ran the same program t=
he
>> same as I had before the move, however the firing has taken less time at
>> thenew house dispite the same program, however the taking less time is o=
n the
>> up ramp. I may just have to make up a couple test batches to see if a ne=
w
>>glaze makes the difference or if it is going to be me playing around with=
the
>> controller. I just thought I would ask if there is something that happe=
ns
>> to a glaze when it freezes that would cause this.
Whether freezing a liquid glaze makes a difference in fired results depends
on what's in the glaze to start. If there are soluble components, that coul=
d
make a difference.
You wrote using the same firing schedule, but less time on the heating ramp=
,
so this would indicate slowing heating ramps previously and thus more work
heat. You can duplicate this previous firing schedule by slowing the curren=
t
heating ramps. You may also want to carefully compare the cooling ramps.
Bill
--
William "Bill" Schran
wschran@cox.net
wschran@nvcc.edu
http://www.creativecreekartisans.com
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