Ron Roy on mon 2 sep 02
Hi Gene,
I have recalculated your glaze to lower the expansion - you did not say
when the crazing happened or if the crazing was fine or not - all valuable
info when looking for corrections. If the crazing happens a day or a week
after it comes out of the kiln it means the glaze need only a small
adjustment. If the ware is finely crazed when it comes out of the kiln more
adjustment is needed.
F3134 - 20.0
Neph Sy - 13.5
Talc - 3.0
Wollas - 18.0
EPK - 19.0
Silica - 26.5
Total - 100.0
>Hello All !!!!!!!!
>I have a clear cone 6 glaze that works and looks great except on bowls,
>where it crazes like crazy. All other shapes no problem.
>
>I bisque to cone 08 and fire to cone 6, use standards 119 and 181
>stoneware
>clay. I have heard that you can add silica to a glaze to stop crazing,
>but
>if you add silica how much and when you add silica do you have to remove
>some of something else? If so what?
>Here is the recipe if someone could take a look and see if they can
>spot a
>problem I sure would appreciate it !!!
>Clear cone 6
>Frit 3134 21
>Nepheline Syenite 19
>Wollastonite 20
>EPK 16
>Silica 24
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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