Dan Saultman on wed 25 jun 97
I thought I recalled a thread that suggested the substitution ratio from
zircopax to superpax. But couldn't find it. Could someone suggest the
percentage that would allow superpax to replace zircopax? This would be
for cone 6 glazes. Specifically white shiney opaques.
Thanks to all.
Dan Saultman near Fort Collins, Colorado
Tom Buck on fri 27 jun 97
According to my dealer's data:
Zircopax= 64.9% ZrO2, 34.3% SiO2, 0.2% TiO2, 0.7% Fe2O3; 0.1% Al2O3; and
LOI 0.05.
Superpax= 62.2 % ZrO2, 36.4% SiO2, 0.2% TiO2, 0.04% Fe2O3, 0.3% Al2O3; and
LOI 0.6%.
So, from a glaze's viewpoint, the two materials are the same.
Tom Buck (new email address: )
old:
Hamilton, Ontario, Canada
Tom Buck on fri 27 jun 97
Well, DS, particle size rather than chemical composition will determine
the "hand" of the fired glaze since neither of the zirconium silicate
materials will dissolve in the glaze melt to any significant amount but
will be dispersed in the glaze layer (near and/on the surface too). Larger
ZrO2.SiO2 crystals will make for a more matte-like surface. Tiny crystals
will give a "whiter" look. These opaquing agents come in different
particle sizes so you should check that out with your supplier.
Tom Buck (new email address: )
old:
Hamilton, Ontario, Canada
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