Dianna Shandorf on tue 5 oct 04
Can I substitute eqal amounts of calcium carbonate and magnesium carbonate for
dolomite? I want to test a cone 06-04 glaze that calls for 8% dolomite, and can't find
any in my studio (afraid I discarded it long ago in a fit of cleaning madness).
Ron Roy on fri 8 oct 04
Hi Dianna,
Probably too late with this but -
Now this all depends on - if your dolomite is the same as mine - it is one
of the materials we use that can vary quite a bit from mine to mine.
In order to get the same mols of each you will need more like 57 whiting
and 43 Mag carb - I think - this gets even trickerier because there is
light and heavy mag carb.
It is not a good thing to do if there is a lot of dolomite in the glaze -
like over 10% - magnesium carb (light) promots crawling due to it's high
rate of shrinkage during sintering.
RR
>Can I substitute eqal amounts of calcium carbonate and magnesium carbonate for
>dolomite? I want to test a cone 06-04 glaze that calls for 8% dolomite,
>and can't find
>any in my studio (afraid I discarded it long ago in a fit of cleaning
>madness).
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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