karen gringhuis on fri 29 sep 06
Jane -
A freind suggested using your line blend route,
instead of reducing clay, try adding lithium. Start
with 2% or 4% increasing to a max of 8%. Just add the
Li "below the line" in addition to your base glaze
which will still total 100%. The Li will hit the clay
and dissolve the alumina out of it.
Lowering the clay is a standard approach to
crystalline glazes and might eventually work but
adding Li may be easier.
If you run tests, please let me know how they come
out. Good luck.
Karen Gringhuis
KG Pottery
Box 607 Alfred NY 14802
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Jane Murray-Smith on sat 30 sep 06
Karen,
(I tried to get an answer to this through the archives, but after the 1st
page of entries, the next page just wouldn't load)
Since the glaze is going to be used on food surfaces, I am wondering at what
% of lithium I should stop in order for it to be food safe...(if any at all)
Thanks, Jane
----- Original Message -----
From: "karen gringhuis"
To:
Sent: Friday, September 29, 2006 9:38 PM
Subject: How to lower maturation temperature
> Jane -
>
> A freind suggested using your line blend route,
> instead of reducing clay, try adding lithium. Start
> with 2% or 4% increasing to a max of 8%. Just add the
> Li "below the line" in addition to your base glaze
> which will still total 100%. The Li will hit the clay
> and dissolve the alumina out of it.
>
> Lowering the clay is a standard approach to
> crystalline glazes and might eventually work but
> adding Li may be easier.
>
> If you run tests, please let me know how they come
> out. Good luck.
>
> Karen Gringhuis
> KG Pottery
> Box 607 Alfred NY 14802
>
> __________________________________________________
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> Tired of spam? Yahoo! Mail has the best spam protection around
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>
Ron Roy on sun 1 oct 06
A note of caution about the use of Lithium Carbonate in glazes.
Using more than 2% in a glaze can result is some very strange fit problems
on some clay bodies - like shivering and crazing at the same time.
RR
>A freind suggested using your line blend route,
>instead of reducing clay, try adding lithium. Start
>with 2% or 4% increasing to a max of 8%. Just add the
>Li "below the line" in addition to your base glaze
>which will still total 100%. The Li will hit the clay
>and dissolve the alumina out of it.
>
>Lowering the clay is a standard approach to
>crystalline glazes and might eventually work but
>adding Li may be easier.
Ron Roy
RR#4
15084 Little Lake Road
Brighton, Ontario
Canada
K0K 1H0
Alisa Liskin Clausen on thu 5 oct 06
>
>A freind suggested using your line blend route,
>instead of reducing clay, try adding lithium. Start
>with 2% or 4% increasing to a max of 8%. Just add the
>Li "below the line" in addition to your base glaze
>which will still total 100%. The Li will hit the clay
>and dissolve the alumina out of it.
>
I am late on the reading, but
I think using a strong Alkaline oxide, you will probably lower your
maturation temp. maybe to the point where the glaze where run. You may,
also however, introduce other problems that will out weigh the problem you
solve.
I would try a frit or Gerstely Borate instead of Lithuim. I have not
experimented with lowering maturation temps. in this way However, I
recall reading, I believe, in CT Pete Pinnell's column, where he
suggested adding up to 10 percent Gerstely Borate to lower cone 9 glazes
to ca. cone 6. It could be interesting to get see on a glaze cal. program
how different fluxes change the glaze's appearence at your desired cone.
Line blends are very useful in this type of experiment, especially for
establishing the eutectic point of your mixes.
Best regards,
Alisa in Denmark
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