Reid Harvey on sun 29 nov 98
Dear Clayartists,
Bill Amsterlaw sent me the following so I am following up on a posting
of 1952 underglazes, first with seger cone formulas, not recipes, as
first stated. (I've temporarily misplaced the remaining underglaze
recipes, but will follow up.)
<< If there is interest I could give the remaining twelve or so (those
>not
>containing lead) >>
>I would be grateful if you would post the whole list of recipes. If you
>would be willing... I would be eager to see those recipes for Seger >cones.
>Your idea of using the Seger recipes as a model for claybodies that fire >to
>different temperatures sounds like a bright idea.
* * * *
Sorry to say I wasn't so bright, first thinking they were recipes, and
now seeing that they would be better used in frit formulation, eg. with
alkalies adding up to one in each case, conventional for frit.
The Seger cone formulas, from Glazes for the Self Reliant Potter, are
complete, from ^022 through ^18, but I'm including every second cone
from ^08 upto ^11.
^08a
Na2O 0.279, K20 0.038, CaO 0.369, MgO 0.314
Al2O3 0.543
SiO2 2.691, B2O3 0.559
^06a
Na2O 0.247, K20 0.069, CaO 0.407, MgO 0.277
Al2O3 0.561
SiO2 3.197, B2O3 0.493
^04a
Na2O 0.204, K20 0.109, CaO 0.458, MgO 0.229
Al2O3 0.586
SiO2 3.860, B2O3 0.407
^02a
Na2O 0.157, K20 0.153, CaO 0.513, MgO 0.177
Al2O3 0.611
SiO2 4.572, B2O3 0.314
^1a
Na2O 0.109, K20 0.198, CaO 0.571, MgO 0.122
Al2O3 0.639
SiO2 5.320, B2O3 0.217
^3a
Na2O 0.059, K20 0.244, CaO 0.630, MgO 0.067
Al2O3 0.667
SiO2 6.083, B2O3 0.170
^5a
Na2O 0.028, K20 0.274, CaO 0.666, MgO 0.032
Al2O3 0.684
SiO2 6.565, B3O2 0.056
^7
K2O 0.3, CaO 0.7
Al2O3 0.7
SiO2 7.0
^9
K2O 0.3, CaO 0.7
Al2O3 0.9
SiO2 9.0
^11
K2O 0.3, 0.7
Al2O3 1.2
SiO2 12.0
END
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