sacredclay on mon 7 may 07
-Lynn, which frit did you switched to? Is it gram for gram as in G.B.?
Any significant difference in the glazes since the switch other than
the lack of instability/ thanks! Kathryn in NC-- In
>
> It sounds to me like one of your materials has changed. Is there
> gerstley borate in your glaze? It's notorious for changing from bag
> to bag (I took it out of my recipes and switched to frit for this
> very reason). Ask your ceramic supplier if there is info on both the
> previous bag and the current bag, then compare what has changed; you
> should be able to get it back to what it was.
>
> Lynn
>
>
Lynn Goodman Porcelain Pottery on tue 8 may 07
On May 7, 2007, at 7:42 PM, sacredclay wrote:
> -Lynn, which frit did you switched to? Is it gram for gram as in G.B.?
> Any significant difference in the glazes since the switch other than
> the lack of instability/ thanks! Kathryn in NC-- In
I use 3195, gram for gram, then add in a little more whiting to
compensate for the slightly lower calcium level (start with 5% and
test). Works very well!
Lynn
Lynn Goodman
Fine Porcelain Pottery
Cell 347-526-9805
www.lynngoodmanporcelain.com
F. VanSickle on tue 8 may 07
What kind of frit do you substitute for G.B.?
I'd appreciate knowing.
Barbara
----- Original Message -----
From: "sacredclay"
To:
Sent: Monday, May 07, 2007 4:42 PM
Subject: Re: frit for gerstley borate
-Lynn, which frit did you switched to? Is it gram for gram as in G.B.?
Any significant difference in the glazes since the switch other than
the lack of instability/ thanks! Kathryn in NC-- In
>
> It sounds to me like one of your materials has changed. Is there
> gerstley borate in your glaze? It's notorious for changing from bag
> to bag (I took it out of my recipes and switched to frit for this
> very reason). Ask your ceramic supplier if there is info on both the
> previous bag and the current bag, then compare what has changed; you
> should be able to get it back to what it was.
>
> Lynn
>
>
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Ron Roy on wed 9 may 07
I just calculated this sub - the boron is just right and the calcium is a
little up and the MgO a little down - but the alumina and silica are way
up.
I had to do quite a bit of adjusting to get the recipes the same using 3195.
In the end - calculation is the way to do this - you are just not going to
find a frit that you can sub in one for one.
Send me the glaze and tell me which frits you can get and I'll see what I
can do.
RR
>I use 3195, gram for gram, then add in a little more whiting to
>compensate for the slightly lower calcium level (start with 5% and
>test). Works very well!
Ron Roy
RR#4
15084 Little Lake Road
Brighton, Ontario
Canada
K0K 1H0
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