Ann Brink on tue 22 jun 04
Hi Loryn- Since you want to go hotter with this glaze, you need to reduce
the proportion of flux, (the GB) instead of increase it.
Ann Brink in Lompoc CA
----- Original Message -----
From: "Lor & Jas White"
To:
Sent: Tuesday, June 22, 2004 7:17 PM
Subject: altering glaze temp.
Hi everyone
I was going to try and alter a cone 5 glaze to fire at cone 6. I'm not
really sure how to do this so I was hoping for some advice. I started by
decreasing the silica a little while keeping si:al ratio kinda the same.
Heres the original and what I was going to test. I'm not sure If I altered
it enough to get any different results at all. Any advice? Anything will
be greatly appreciated. It actually fires quite nice at cone 6 but way
nicer at cone 5
Cone 5 Brown glaze SI:AL=6.19
Gerstly Borate 50
Silica 25
EPK 25
100
ADD RIO 10
My altered cone 6 recipe???? Si:AL=5.98
Gerstly Borate 52.1
Silica 23.2
EPK 24.7
100
RIO 11.4
Thanks Loryn White
Lor & Jas White on tue 22 jun 04
Hi everyone
I was going to try and alter a cone 5 glaze to fire at cone 6. I'm not =
really sure how to do this so I was hoping for some advice. I started =
by decreasing the silica a little while keeping si:al ratio kinda the =
same. Heres the original and what I was going to test. I'm not sure If =
I altered it enough to get any different results at all. Any advice? =
Anything will be greatly appreciated. It actually fires quite nice at =
cone 6 but way nicer at cone 5
Cone 5 Brown glaze SI:AL=3D6.19 =20
=20
Gerstly Borate 50
Silica 25
EPK 25=20
100
ADD RIO 10
My altered cone 6 recipe???? Si:AL=3D5.98
Gerstly Borate 52.1
Silica 23.2
EPK 24.7
100
RIO 11.4
Thanks Loryn White
Ivor and Olive Lewis on wed 23 jun 04
Dear Loryn White,
Two factors determine the way the maturity temperature will move when
we wish to make a change.
They are
a. Increase or decrease of the main melting agent. In your example,
Gerstly Borate.
Adding more melting agent lowers the maturing temperature.
b, Increase or decrease in the quantity of relatively refractory
materials. In your example, Kaolin and Silica.
Adding more Kaolin with elevate the maturity temperature without
seriously affecting the Vitreosity or glassiness. Changing Silica can
affect the vitreosity.
Though, of course there,may be other contrary opinions.
Best regards,
Ivor Lewis.
Redhill,
S. Australia.
.
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