Patrice Murtha on wed 11 aug 99
I have a notation that Kona A3 or Carolina Stone can be substituted for
Cornwall Stone. (Now I'm not sure if that is a typo and it should be Kona
F3 but that's what I have in my notes from my glaze class). Hope this
helps.
David Hewitt on thu 12 aug 99
For what it is worth I also have Kona A3 down as a near substitute for
Cornwall Stone, but I have no experience of using it. The data that I
have gives their unity formulae as follows:-
Cornwall Kona A-3
Stone
K2O .340 .549
Na2O .395 .392
CaO .239 .059
MgO .026
Al2O3 1.118 1.062
Fe2O3 .009
SiO2 9.128 7.961
TiO2 .014
MW 743.4 668.4
Whether or not the differences would be significant enough to make a
difference in your particular glaze and its end usage only testing would
tell, but if I were wanting to substitute Kona A-3 for Cornwall Stone I
would put it through a glaze calculation program and so make some
adjustments for the differences.
David
In message , Patrice Murtha writes
>----------------------------Original message----------------------------
>I have a notation that Kona A3 or Carolina Stone can be substituted for
>Cornwall Stone. (Now I'm not sure if that is a typo and it should be Kona
>F3 but that's what I have in my notes from my glaze class). Hope this
>helps.
>
--
David Hewitt
David Hewitt Pottery ,
7 Fairfield Road, Caerleon, Newport,
South Wales, NP18 3DQ, UK. Tel:- +44 (0) 1633 420647
FAX:- +44 (0) 870 1617274
Own Web site http://www.dhpot.demon.co.uk
IMC Web site http://digitalfire.com/education/people/hewitt.htm
Tony Hansen on tue 17 aug 99
>I have a notation that Kona A3 or Carolina Stone can be substituted for
>Cornwall Stone. (Now I'm not sure if that is a typo and it should be Kona
>F3 but that's what I have in my notes from my glaze class). Hope this
>helps.
For info on creating a substitute check this web page:
http://digitalfire.com/magic/Cornwall.htm
--
T o n y H a n s e n thansen@digitalfire.com
Don't fight the dragon alone http://digitalfire.com
Calculation/Database Software for Ceramic Industry
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