Stephani Stephenson on fri 31 jan 03
I guess the question would be is what are the minimum amounts of
sodium and potassium you need
for the color response? and how low does the alumina or the alumina to
silica ratio need to be?
with regard to expansion, Frit 3110 is definitely a high expansion
frit.
I have a lower fire high alkaline glaze that I use.
Switching from frit 3110 to 3269 changes the % of pertinent materials
as shown below in my glaze. (This % below is a formula % not a recipe
% and doesn't reflect the total % of all the elements or ingredients
in the glaze.....) The % of actual frit in the recipe is 50%. Also
there is EPK and whiting in the recipe. I don't know the color you are
aiming for but I get vibrant greens with both variations.
Your glaze would be an excellent candidate for Ian Curries grid
method... to find out just where the color shift starts to occur and
where the crazing abates.... and if there is a sweet spot where you can
get minimal crazing and good color.
On this one I too consider myself always learning rather than
knowing!!!!!!!
with 3110
48.51 % SiO2
5.53 % Al2O3
1.27 % B2O3
1.17 % K2O
7.55 % Na2O
8.62 % CaO
with 3269
38.73 % SiO2
10.17 % Al2O3
7.43 % B2O3
4.00 % K2O
5.46 % Na2O
5.58 % CaO
Stephani Stephenson
Carlsbad CA
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