Bob Stryker on thu 1 aug 96
>----------------------------Original message----------------------------
>I am preparing Cone 06 glazes comprised largely of frits and feldspar.
>For suspension, I add 0.5 Macaloid and 2 tablespoons of CMC mixture per
>100 grams of glaze.
Richard,
For earthenware glazes with a high percentage of frit, I generally use .5%-1%
bentonite, .5%-1% Veegum T and .25% CMC. I use a blender to pre-mix these
materials.
The CMC does not provide a good deal of suspending qualities, rather it is
primarily functioning as a binder, one that creates a somewhat durable "shell"
once your glaze has dried. One reason I shear CMC into the glaze from a powder
state, is that once it is introduced into a solution it will begin to decay.
Not many people are aware that 80%-95% of almost any frit combined with 20%-5%
ball clay or kaolin can make a decent earthenware base glaze. Ball clays ( I
prefer Number 1 Glaze Clay - it is reasonably clean and contributes tremendously
to suspension ) and to a lesser extent, kaolins provide extra suspending
qualities as well as important sources of alumina and silica to the melt.
Bob Stryker
mnclayus@mm.com
http://www.mm.com/mnclayus/
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