Craig Martell on tue 23 apr 02
Hello Veena:
If this "minspar" you're asking about is actually "Unispar 50" from Unimin
Specialty Minerals, it's real close to f-4. I've heard that Minspar is
actually Unispar 50 but I don't know this as an absolute certainty.
I ran out of f-4 about a year ago and changed to Unispar 50 with very good
results. I've done some direct substitutions with little or no change in
the glazes. When I fired fusion buttons of f-4 and Unsipar 50, they were
almost identical in rate of fusion and color and clarity. The craze
frequency was just about identical as well. So, ask your supplier if what
you have is Unispar 50.
regards, Craig Martell in Oregon
Veena Raghavan on tue 23 apr 02
Dear Fellow Clayarters,
I would appreciate any help on the following:
Our local supplier does not carry Kona F-4 but sells Minspar as F-4. In m=
y
ignorance, I purchased some not realizing there might be a difference. A
fellow potter told me that he had found that the use of Minspar had made =
a
difference in a glaze. As I use F-4 in several glazes but have not used t=
he
Minspar as yet, I would appreciate any advice as to whether I should just=
get some Kona F-4 rather than try to substitute with Minspar. I know, I
know, I should test it and probably will, but I need to mix up some glaze=
s
and use them fairly soon, so would appreciate help.
Thank you in advance.
Veena
Veena Raghavan
75124.2520@compuserve.com
David Hendley on wed 24 apr 02
They are the same. I found this out firsthand last year when I
drove up to Asheville and then to Penland after the NCECA
Conference in Charlotte. In plain view from the highway is the
mountain they are slowly eating away to supply us with feldspar.
The offices and facilities for the different feldspar companies are
across the road or down the street from each other.
I use 'Minspar 200' for soda feldspar. The first time I bought it
I asked for and got an analysis, and it was very close to my
numbers I had on file for Kona from years ago.
David Hendley
Maydelle, Texas
hendley@tyler.net
http://www.farmpots.com
----- Original Message -----
From: "Veena Raghavan" <75124.2520@COMPUSERVE.COM>
To:
Sent: Tuesday, April 23, 2002 7:29 PM
Subject: F-4 Feldspar and Minspar
Dear Fellow Clayarters,
I would appreciate any help on the following:
Our local supplier does not carry Kona F-4 but sells Minspar as F-4. In my
ignorance, I purchased some not realizing there might be a difference. A
fellow potter told me that he had found that the use of Minspar had made a
difference in a glaze. As I use F-4 in several glazes but have not used the
Minspar as yet, I would appreciate any advice as to whether I should just
get some Kona F-4 rather than try to substitute with Minspar. I know, I
know, I should test it and probably will, but I need to mix up some glazes
and use them fairly soon, so would appreciate help.
Thank you in advance.
Veena
Veena Raghavan
75124.2520@compuserve.com
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