June Perry on sun 5 may 02
Julie, I used Insight to get an empirical match for Frit 3124 Here is a 100%
formula match. If you want to use it, just mix up enough of this and mix
well
and use the amount called for in your recipe.
Frit 3124 substitute formula
22.94 GERSTLEY BORATE
14.81 WHITING
6.88 EPK KAOLIN
29.74 SILICA
25.63 NEPHELINE SYENITE
This is empirically pretty on for Frit 3123. As you can see, just
substituting gerstley and soda ash would not have given you an empirical
match.
Ron Roy on tue 7 may 02
I don't get a match by the way - this has boron at 0.28 mols (7.45%) and
3124 has 0.55 (13.70) more than I would expect from the normal fluctuation
of G Borate. I also note - there is usually a significant amount of MgO
with GB but none with Frit 3124.
More to the point I suppose is the fact that the frit - being a melted
material is going to melt faster than this sub simply because it is all
melted to start with.
I am not saying it is not right to build materials - but you have to do it
in a way that makes sense.
Perhaps the extra B2O3 in this material helps to overcome the extra melting
needed - I would certainly be interested to see the results in glazes of
frit 3124 and this material.
RR
>Frit 3124 substitute formula
>
>22.94 GERSTLEY BORATE
>14.81 WHITING
> 6.88 EPK KAOLIN
>29.74 SILICA
>25.63 NEPHELINE SYENITE
>
>This is empirically pretty on for Frit 3123. As you can see, just
>substituting gerstley and soda ash would not have given you an empirical
>match.
Ron Roy
RR #4
15084 Little Lake Road
Brighton
Ontario
Canada - K0K 1H0
Phone: 613-475-9544
Fax: 613-475-3513
Jim V Brooks on wed 8 may 02
I am a little slow these days.. BUT..if i have Gerstley Borate,, why do i
need to use F3124? If i dont have GB,, how do i mix this recipe -- since
it
requires GB to mix..
Ron.. can you give us a recipe for F3124 that doesn't require Gerstley
Borate.. ?
Thanks...................................... Jim in Denton...
Ron Roy on fri 17 may 02
Hi Jim,
I'm having some trouble trying to figure out the answers to this question.
Let me ask some questions and answer them in the hope it will clarify my
attitude.
Why convert a glaze containing GB to a boron Frit?
I suppose the best answer is - because GB is a variable material and it
will not be available in the future. There are problems with GB in the wet
glaze stage - in the bucket. The current cost of GB - if you consider the
loss on ignition - is much closer to the cost of a Frit now.
If you don't have GB and a glaze calls for it - we have to adjust the glaze
so we get the boron needed from a Frit. This has been done with many GB
glazes and in most cases it is not a problem.
I could provide a recipe for 3124 - the following would be very close but
it contains soda ash which is soluble and it would need to be fritted.
Unfritted it would not melt the way a Frit would - melted materials are
easier to re melt.
Cady Cal - 24.0
Whiting - 9.5
EPK - 21.5
Silica - 35.50
Soda Ash 9.5
Total 100.0
Ratio - 9.51 (Frit 3124 has a (Si/Al) ratio of 9.50)
Expansion - 468.50 (Frit 3124 has an expansion of 471.26)
Perhaps the next question is - what if I don't have CadyCal? The answer to
that is get some or find another source of boron for the recipe - like
boric acid (soluble) - just the way Frit manufactures do it.
If you have glaze calculation software with reliable material analysis -
and you have spent the time needed to learn how to use it - this is a
relatively easy process. You do need to know which materials are going to
supply which oxides but you need to know that to deal with glazes anyway.
I have a question! Why would anyone choose Frit 3124 (Fusion #F19)? It is
clearly not the Frit of choice for replacing GB. 3134 (Fusion #12) is
clearly the better choice. 3134 is the same as 3124 but without any
Alumina. You get more Boron (almost twice as much) and that is what you are
after - so you need much less.
In a glaze with 25% GB you would need about 56% of 3124 to get enough boron
to replace the boron in GB using the 1997 analysis of GB.
If you use 3134 you need about 32% - now all you need to know is your local
price of the two frits to figure out the savings.
There is an advantage to having extra clay in a glaze (raw clay supplies
the alumina not in the 3134) - it helps suspension in the bucket better -
needs less stirring - and does not suffer from the disadvantage of gelling
the glaze over time as with GB.
So Jim - after all that I have the feeling I have not answered your
question - could it be you simply would like a conversion for a glaze
subbing 3134 for GB?
If so I need the recipe.
RR
>I am a little slow these days.. BUT..if i have Gerstley Borate,, why do i
>need to use F3124? If i dont have GB,, how do i mix this recipe -- since
it
>requires GB to mix..
>
>Ron.. can you give us a recipe for F3124 that doesn't require Gerstley
>Borate.. ?
>
>Thanks...................................... Jim in
Denton...
Ron Roy
RR #4
15084 Little Lake Road
Brighton
Ontario
Canada - K0K 1H0
Phone: 613-475-9544
Fax: 613-475-3513
Jim V Brooks on fri 17 may 02
Ron, thank you very much.. Yes i can handle the conversions.. I was just
curious as to why someone would want a recipe for a frit that calls for GB
when that seemed to be what they wanted to replace. I have GB.. probably
enough to last me the rest of my life.. and i also have Frit 3134... But
it
would be fun to play with the mixes..and see if i can mix up my own..
I am a glaze test freak, I enjoy coming up with new glazes..even if i
never
use them. I often test your recipes as they appear here... and index
them ... for possible future use..
Ron... i would like to thank you ..for all of Clayart ..for the
help/assistance you give us.. It makes all our lives a little easier..
.Thank you again.... ....... Jim in Denton.
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