Alisa Clausen on thu 30 oct 03
Dear Darlene,
The recipe on the site calles for MOK 3, which is also called Frit J in
Denmark.
This is a frit supplied by M.O. Knudsen, one of our larger ceramic material
suppliers. I believe it is produced by Johnson Mathey, Stoke on Trent, UK.
The frit is a borax frit with a softening state of 550c and is therefore
commonly used as a raku frit.
However, it is a frit I testing gram for gram subs. instead of Gerstely
Borate. The glazes are well melted at cone 6. The site's glaze is said
for orton cone 7 - 9.
You will not find this Frit or exact equivilant in the US, or I have not.
I am testing it now instead of the Frit 623 or Frit 169 which I have used,
because this frit contains neither Zinc ox. nor Barium ox. If you
calculate your glaze, maybe you can come close to the formula. If you make
a similar glaze but different analysis, try subbing with your local frits.
It would be interesting to hear your results, to see what an American does
with a Swedish recipe, as I have been working with US glazes in Danish
materials.
Unity formula for frit is according to MOK:
0,214 K2O
0,417 Na2O
0,366 CaO
0,002 MgO
---------------------------
0,205Al2O3
1,884 SiO2
0,452 B2O3
What is the name of this Swedish site, as I would like to see the rest of
it?
regards from Alisa in Denmark
Ron Roy on sun 2 nov 03
Hi Alisa,
If you have the unity formula you have the analysis of any frit.
If you have a glaze calculator you can work from the recipe side and get
the unity formula - in this case use K20 and get the amount to 0.214 - then
the same for all the rest - it helps a lot to be able to set the increments
to what ever amount - I used 0.5 to get close - adjusting the oxides so
the unity formula was close to right. I then set the increments (the amount
you add or subtract from or to the oxides in the recipe window) at .01
Took me abour 10 minutes - then simply look at the % weight and you have
the frit analysis. Frits are easy because there is no LOI.
CaO - 8.85
MgO - 0.027
K2O - 8.68
Na2O - 11.16
B2O3 - 13.58
Al2O3 - 9.01
SiO2 - 48.70
Total - 100.0
Any body want to try this?
Tell me what the analysis of this frit is.
Na2O3 = 1.0 < Seger unity on the flux
Al2O3 = 0.5
SiO2 = 2.5
It's not a real frit but it's a simple one to solve.
RR
>The recipe on the site calles for MOK 3, which is also called Frit J in
>Denmark.
>
>This is a frit supplied by M.O. Knudsen, one of our larger ceramic material
>suppliers. I believe it is produced by Johnson Mathey, Stoke on Trent, UK.
>
>The frit is a borax frit with a softening state of 550c and is therefore
>commonly used as a raku frit.
>
>However, it is a frit I testing gram for gram subs. instead of Gerstely
>Borate. The glazes are well melted at cone 6. The site's glaze is said
>for orton cone 7 - 9.
>
>You will not find this Frit or exact equivilant in the US, or I have not.
>I am testing it now instead of the Frit 623 or Frit 169 which I have used,
>because this frit contains neither Zinc ox. nor Barium ox. If you
>calculate your glaze, maybe you can come close to the formula. If you make
>a similar glaze but different analysis, try subbing with your local frits.
>It would be interesting to hear your results, to see what an American does
>with a Swedish recipe, as I have been working with US glazes in Danish
>materials.
>
>Unity formula for frit is according to MOK:
>0,214 K2O
>0,417 Na2O
>0,366 CaO
>0,002 MgO
>---------------------------
>0,205Al2O3
>1,884 SiO2
>0,452 B2O3
>
>
> What is the name of this Swedish site, as I would like to see the rest of
>it?
>
>regards from Alisa in Denmark
Ron Roy
RR#4
15084 Little Lake Road
Brighton, Ontario
Canada
K0K 1H0
Phone: 613-475-9544
Fax: 613-475-3513
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