Paul Lewing on mon 17 apr 00
Cadycal is a calcium borate material that can in some cases be
substituted for Gerstley Borate of frits. Not always, though, as it has
more alumina and silica. If you'd like an analysis, I can send you one.
Paul Lewing, Seattle
Ron Roy on wed 19 apr 00
My analysis for CadyCal (from the mine) has hardly any alumina or silica -
it's mostly calcium and boron.
My numbers on Gerstley Borate say it has more alumina and silica - I have 4
analysis - than Cady Cal in every case.
RR
>----------------------------Original message----------------------------
>Cadycal is a calcium borate material that can in some cases be
>substituted for Gerstley Borate of frits. Not always, though, as it has
>more alumina and silica. If you'd like an analysis, I can send you one.
Ron Roy
93 Pegasus Trail
Scarborough
Ontario, Canada
M1G 3N8
Evenings 416-439-2621
Fax 416-438-7849
Paul Lewing on thu 20 apr 00
Ron Roy wrote:
>
> ----------------------------Original message----------------------------
> My analysis for CadyCal (from the mine) has hardly any alumina or silica -
> it's mostly calcium and boron.
>
> My numbers on Gerstley Borate say it has more alumina and silica - I have 4
> analysis - than Cady Cal in every case.
>
> RR
>
> >----------------------------Original message----------------------------
> >Cadycal is a calcium borate material that can in some cases be
> >substituted for Gerstley Borate of frits. Not always, though, as it has
> >more alumina and silica. If you'd like an analysis, I can send you one.
Ron, you're right again. (we're not surprised) I had, once again,
typed without checking the numbers. My comment was based on a
conversation with another glaze techie at NCECA who was obviously wrong.
Sorry, folks.
For those many who asked me to send them an analysis of Cadycal, here is
what I have:
B2O3 48%
Cl .1
SO3 .1
SiO2 1.0
Fe2O3 .08
CaO 28
Na2O .1
Al2O3 .2
K2O .03
MgO .3
SrO .04
Moisture 2
Some day, I'll learn not to rely totally on my memory for this stuff.
As they say, the memory is the second thing to go.
I don't remember what's first.
Paul Lewing, Seattle
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