Brad Sondahl on mon 12 may 03
Mel says crystal glazes are hard on coils.
That hasn't been my experience, firing them for 10 years. I suppose
ingredients may vary, but there's nothing in the crystal glaze recipes I
use which should attack elements, outside of Copper Carbonate, which I
use a lot more of in my green glazes, and which fumes at cone 9 and is
quite reactive. As far as I can tell, my elements last as long now,
firing to cone 9 oxidation, as they ever did before, also firing to cone
9 oxidation. Certainly element life is expected shorter when one fires
consistently at that range, as the elements are on high for probably
twice as long as for a midrange firing. Also if you overfire (above
10), that will rapidly shorten their lives. As it is, I fire about 100
glaze firings per year , and the elements last up to two years (without ITC)
Brad Sondahl
--
For original art, music, pottery, and literature, visit my homepage
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Ellie Blair on mon 12 may 03
Brad,
I have a cone 10 skutt kiln. I have never fired it over 2350 and I have a
few glazes that call for 2400. Can I push my kiln like that. I do
crystalline glazes and only do cone 9-10. My kiln is only about a year old
and I wondered how many firings I could get out of it before I needed to
replace my elements. You answered it for me.
Thanks,
Ellie B.
----- Original Message -----
From: "Brad Sondahl"
To:
Sent: Monday, May 12, 2003 10:54 AM
Subject: Re: crystal glazes and coils
> Mel says crystal glazes are hard on coils.
> That hasn't been my experience, firing them for 10 years. I suppose
> ingredients may vary, but there's nothing in the crystal glaze recipes I
> use which should attack elements, outside of Copper Carbonate, which I
> use a lot more of in my green glazes, and which fumes at cone 9 and is
> quite reactive. As far as I can tell, my elements last as long now,
> firing to cone 9 oxidation, as they ever did before, also firing to cone
> 9 oxidation. Certainly element life is expected shorter when one fires
> consistently at that range, as the elements are on high for probably
> twice as long as for a midrange firing. Also if you overfire (above
> 10), that will rapidly shorten their lives. As it is, I fire about 100
> glaze firings per year , and the elements last up to two years (without
ITC)
>
> Brad Sondahl
>
> --
> For original art, music, pottery, and literature, visit my homepage
> http://sondahl.com
> Pottery sales page http://sondahl.freeyellow.com
> My music site at mp3.com http://www.mp3.com/stations/sondahl
>
>
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