WHC228@AOL.COM on sat 7 feb 04
Ellie
Talk to the folks a Fusion Ceramics.
330 627 5821
They make all kind of frits, and are very knowedgeable about them.
Mike O'Donnel or Dave Schnieder
You could also try www.fusion@raex.com
Dave Schnieder just did a paper for Cerma about crystalline glazes.
They may have a match for you. Many of the frit companies have frits that are
identical to their competitors frits. I believe that there are some
comparason charts. I don't have any for the frits that are used in crystalline work, so
you will have to go to the frit folks.
Bill Campbell
Graeme Anderson on sat 7 feb 04
Hi Ellie.
See if you can borrow H H Sanders book, Glazes for Special Effects. There
is a section on preparing your own frits.
Basically, line a shallow bowl with a smooth paste of silica and water,
about 1/4 " thick. Let it dry. Mix the dry frit ingredients, and put a
fairly thin layer in the bowl, without disturbing the silica.. Fire to
sufficient temp to just melt the frit - probably about 780 - 800C. 1440 -
1480 F. Carefully lift the cake of frit out, brush off any silica, and
crush the frit in mortar and pestle (probably a metal one would be better)
to whatever mesh size you want.
Cheers. Graeme.
Ivor and Olive Lewis on sun 8 feb 04
Dear Graeme Anderson,
These recipes rely on the presence of Group 1 alkali metal carbonates
as melting fluxes. MP of Sodium Carbonate is 851=BA C. There may be a
violent reaction with a lot of bubbling as well. Remember, it is not
the frit you are melting but raw materials
Since you have to get the other refractory compounds into solution,
for several reasons, I would suggest a minimum of 900=BA C. After
blending I would also suggest a prolonged period of mixing.
Best regards,
Ivor Lewis. Redhill, South Australia
Ron Roy on sun 8 feb 04
Hi Ellie,
Do you have an analysis for that frit?
RR
>Hi All,
>I have been trying to find a subsitute for the Degussa frit 90208m. I
>read the glaze recipes in my book "Macro-Crystalline Glazes" by Peter
>Ilsley. I love the effects he achieves with this glaze but I understand
>that the frit is no longer available and was wondering if there was a good
>subsitute on the market. He gives the materials for the frit but I have
>not made my own before and am unsure of the process. If anyone has any
>info on this I would love to hear from you.
>
>Thanks
>Ellie Blair
>Blair Pottery
>Lawrence, Kansas 66047
Ron Roy
RR#4
15084 Little Lake Road
Brighton, Ontario
Canada
K0K 1H0
Phone: 613-475-9544
Fax: 613-475-3513
Graeme Anderson on sun 8 feb 04
Dear Ivor
780C on my pyrometer (possibly 800C actual temp.) was sufficient for the
few frit tests I made. The cake of frit looks horrible, with bubbles,
bloats, etc, and very opaque. The higher the temp, the more the frit
ingredients will melt, and be harder to crush. And more chance of picking
up some of the silica lining.
IMHO I consider it to be calcining of soluble ingredients, and an easier
way of doing it than by calcining the materials separately, and then
combining them.
Cheers. Graeme.
John Britt on sun 8 feb 04
Graeme,
Whenever I make frit I let it heat until the bubbling has ceased and the
materials are fluid, then I pour this into a bucket of cold water. (taking
appropriate precautions like a face shield, gloves, etc.) After that has
cooled I ball mill the material. This makes it much easier to grind the
material.
Hope that helps,
John Britt
Ivor and Olive Lewis on mon 9 feb 04
Dear Graeme,
Did you test your fritted material to see if it was still water
soluble? What you describe seems to indicate that not everything
melted.
Best regards,
Ivor Lewis. Redhill, South Australia
Graeme Anderson on mon 9 feb 04
Dear Ivor and John.
I just put the materials in a bowl during a normal bisc firing, and when
cool, lift the cake out and grind it to powder in an iron mortar and
pestle. I haven't tested it for solubility, as I only used the powder in a
glaze which I used immediately, with brushing the glaze on to the pot.
On another subject, Ivor - I found an old newspaper article - "The down-to-
earth diet" - on clay eating. Would you like me to scan it for you? Will
your system accept attachments - or do you need to be warned beforehand?
Cheers. Graeme.
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