John Anthony on fri 1 apr 05
eric wrote
> I need to figure:
>
> SiO2 62
> Al2O3 14.75
> CaO 23.25
>
> using:
>
> Quartz
> EPK
> Whiting
>
> The closest I can come is Quartz 35
> Whiting 30
> EPK 30
>
> Any help will be greatly appreciated.
>
> E R I C
> --
Hyperglaze says that
Silica 35.81
EPK 30.70
Whiting 33.49
is:
61.83 % SiO2
14.27 % Al2O3
0.16 % K2O
23.28 % CaO
0.07 % MgO
0.20 % Fe2O3
0.06 % P2O5
0.13 % TiO2
does that help?
John A
Eric Hansen on fri 1 apr 05
Hello ClayArters: I am working on a formula for Yue ware limestone glaze (I=
deal Limestone Eutectic Glaze) from Nigel Woods book but the InterGlaze cal=
culator by Gary Wang includes LOI. Does anyone have a better calculation pr=
ogram for this project? I need to figure:
=20
SiO2 62
Al2O3 14.75
CaO 23.25
using:
Quartz
EPK
Whiting
The closest I can come is Quartz 35
Whiting 30
EPK 30
Any help will be greatly appreciated.
E R I C
--=20
_______________________________________________
NEW! Lycos Dating Search. The only place to search multiple dating sites at=
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Louis Katz on fri 1 apr 05
Hi Eric
Looks awfully close to KATZ 111 Celadon, Equal parts
whiting/kaolin/silica
Lots of ways to look at this but if you use real clay you will get some
other fluxes. I subtract these from the Lime. So I come up with
EPK 31.61
Calcium Carbonate 33.09
Silica 35.30
Ends up:
K2O .004
CaO.992
MgO .004
Al2O3 .349
Silica 2.487
TiO2 .004
Fe2O3 .003
P2O5 .001
Bet the Chinese had as hard a time as we do getting pure ingredients. I
would try 1/1/1
Look at:
http://falcon.tamucc.edu/~lkatz/articles/calcia.html
and
http://falcon.tamucc.edu/~lkatz/z/Whiting/index.html
Love it when some asks something I know about.
The 1/1/1 is a great place to start learning about glaze calc. it looks
good with some iron. You canb really see the effect of MgO quickly in
this glaze.
Let me know what you end up with from your tests.
Thanks
Louis
On Apr 1, 2005, at 3:10 PM, Eric Hansen wrote:
> SiO2 62
> Al2O3 14.75
> CaO 23.25
Edouard Bastarache Inc. on fri 1 apr 05
Indeed Louis,
I tested KATZ 111 using increasing amounts of
an innocuous industrial waste material containing
lots of Fe2O3 (82%) with excellent results.
Later,
"Ils sont fous ces quebecois"
"They are insane these quebekers"
"Están locos estos quebequeses"
Edouard Bastarache
Irreductible Quebecois
Indomitable Quebeker
Sorel-Tracy
Quebec
edouardb@sorel-tracy.qc.ca
www.sorel-tracy.qc.ca/~edouardb/Welcome.html
http://perso.wanadoo.fr/smart2000/index.htm
http://www.digitalfire.com/education/toxicity/
Ron Roy on mon 4 apr 05
Hi Eric,
Much depends on what materials you are using and how accurate your analysis
are - here is what I come up with - you will have to decide if it is closer
that yours.
-----------------
SILICA.............. 35.50 35.50%
WHITING............. 33.50 33.50%
EPK................. 31.00 31.00%
----------
100.00
FORMULA & ANALYSIS
------------------
CaO........ .33 22.95%
MgO........ .00 .15%
K2O........ .00 .15%
Na2O....... .00 .02%
Fe2O3...... .00 .34%
TIO2....... .00 .12%
AL2O3...... .11 14.47%
SiO2....... .83 61.76%
P2O5....... .00 .05%
RATIO 7.26
EXPAN 437.69
WEIGHT 80.60
This one will melt faster because the wollastonite is already combined and
there are more trace oxides.
-----------------
Wollastonite........ 50.20 50.20%
EPK................. 33.20 33.20%
SILICA.............. 16.60 16.60%
----------
100.00
FORMULA & ANALYSIS
------------------
CaO........ .38 22.50%
MgO........ .02 .84%
K2O........ .00 .14%
Na2O....... .00 .16%
Fe2O3...... .00 .45%
TIO2....... .00 .11%
AL2O3...... .13 14.21%
SiO2....... .97 61.55%
P2O5....... .00 .04%
RATIO 7.36
EXPAN 439.48
WEIGHT 94.11
I did not use any elaborate criteria to see if the main oxides were in the
correct ratio - just looking and guessing.
Let us know how they melt and at what temperatures please.
RR
>Hello ClayArters: I am working on a formula for Yue ware limestone glaze
>(Ideal Limestone Eutectic Glaze) from Nigel Woods book but the InterGlaze
>calculator by Gary Wang includes LOI. Does anyone have a better
>calculation program for this project? I need to figure:
>
>SiO2 62
>Al2O3 14.75
>CaO 23.25
>
>using:
>
>Quartz
>EPK
>Whiting
>
>The closest I can come is Quartz 35
>Whiting 30
>EPK 30
>
>Any help will be greatly appreciated.
>
>E R I C
Ron Roy
RR#4
15084 Little Lake Road
Brighton, Ontario
Canada
K0K 1H0
Phone: 613-475-9544
Fax: 613-475-3513
Eric Hansen on tue 19 apr 05
Being superstitious about numbers here are a glazes I want to test. I'm not=
testing them at this time but as soon as I move to a new studio I am sure =
I will want to. I was excited about limestone glazes because of their reput=
ed hardness, and how color response is muted.
Based on the Lime-Alumina-Silica Eutectic:
SiO2 62, Al2O3 14.75, Cao 23.25
Katz 1-1-1 cone 10
Whiting 1
Silica 1
EPK 1
Hambone's 123 (cone 6-?)
Wollastonite 3
EPK 2 (try other clays too)
Silica 1
Special Thanks! to Ron Roy for extensive input on this one. This hasn't bee=
n tested yet.=20
Calcium Feldspar Glaze
Anorthite Feldspar 36.16
CaCO3 24.15
quartz 39.69
This comes from Cardew or Parmelee I can't remember which. Also Albite Spar=
melts at the same temp (1170 c), a useful bit of info.
Zinc-Alumina-Silica Eutectic mp 1360 deg.C
ZnO, 0.318Al2O3, 0.81SiO2,
which is too high a cone for most studios. Nonetheless it is one of three p=
arts of the "Watts Ternary":
Orthoclase/Quartz Eutectic - Lime Eutectic - Zinc Eutectic
0.4 KNaO, 0.3 CaO, 0.3 Zno, 0.6 Al2O3, 3.55 SiO2
great if you like zinc.
Here's one without zinc:
Seger Cone 4 Eutectic
0.3 KNaO, 0.7 CaO, 0.5 Al203, 4 SiO2
and here is the quote which answers "why eutectics?"=20
"the most fusible glaze composition of a series of the same type will have =
the widest heat range"
again, allowing me to round out my numbers as in Hambone 123.
I could measure by volume of dry mix instead of weight=20
or by volume of unfired wet glaze solution if I knew how
the choice is to either take a eutectic glaze handed down for generations o=
r instead design you own. The ability to round the numbers slightly comes b=
ecause you are in the deformation eutectic.
E R I C
=20
--=20
_______________________________________________
NEW! Lycos Dating Search. The only place to search multiple dating sites at=
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Louis Katz on wed 20 apr 05
The calculated glaze I came up with for Wollastonite falling near the
CaO-Al2O3-SiO2 eutectic is:
Wollastonite 45
Kaolin 36
Flint 19
But this is based on theoretical materials. Using real materials it
comes out for me around:
Wollastonite Vansil 49
EPK 35
Siilica 17
Nicely close to Hambones 123, close to my 111 molecularly.
>
>
> Hambone's 123 (cone 6-?)
> Wollastonite 3
> EPK 2 (try other clays too)
> Silica 1
> Special Thanks! to Ron Roy for extensive input on this one. This
> hasn't been tested yet.
>
> Calcium Feldspar Glaze
> Anorthite Feldspar 36.16
> CaCO3 24.15
> quartz 39.69
> This comes from Cardew or Parmelee I can't remember which. Also Albite
> Spar melts at the same temp (1170 c), a useful bit of info.
>
> Zinc-Alumina-Silica Eutectic mp 1360 deg.C
> ZnO, 0.318Al2O3, 0.81SiO2,
> which is too high a cone for most studios. Nonetheless it is one of
> three parts of the "Watts Ternary":
> Orthoclase/Quartz Eutectic - Lime Eutectic - Zinc Eutectic
> 0.4 KNaO, 0.3 CaO, 0.3 Zno, 0.6 Al2O3, 3.55 SiO2
> great if you like zinc.
>
> Here's one without zinc:
> Seger Cone 4 Eutectic
> 0.3 KNaO, 0.7 CaO, 0.5 Al203, 4 SiO2
>
> and here is the quote which answers "why eutectics?"
>
> "the most fusible glaze composition of a series of the same type will
> have the widest heat range"
>
> again, allowing me to round out my numbers as in Hambone 123.
> I could measure by volume of dry mix instead of weight
> or by volume of unfired wet glaze solution if I knew how
> the choice is to either take a eutectic glaze handed down for
> generations or instead design you own. The ability to round the
> numbers slightly comes because you are in the deformation eutectic.
>
> E R I C
>
>
>
>
>
>
>
>
>
> --
> _______________________________________________
> NEW! Lycos Dating Search. The only place to search multiple dating
> sites at once.
> http://datingsearch.lycos.com
>
> _______________________________________________________________________
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Craig Martell on wed 20 apr 05
Eric sez:
>I could measure by volume of dry mix instead of weight
>or by volume of unfired wet glaze solution if I knew how
>the choice is to either take a eutectic glaze handed down for generations
>or instead design you own. The ability to round the numbers slightly comes
>because you are in the deformation eutectic.
Hi:
There's an ongoing debate about eutectics. Are they attainable in the
absolute sense, or are they somewhat of a myth? In practical studio
applications where most, or all of us aren't using pristine and highly
accurate methods of measurement and batch preparation, eutectics are
probably an unattainable ideal most of the time. If there's a narrow
parameter involving the mixture of materials that will produce a eutectic
melt, we have to be very accurate about measurement and mixing too. In
other words, we need to have the correct amounts of needed minerals that
are mixed very intimately to produce a eutectic. We also need a very
accurate analysis of what we are using to produce the eutectic mixture.
Another thought is that we deal with other people's eutectic mixture
recommendations and what they used will most likely vary from what we use
so once again, a eutectic mix is tricky if you don't do some variation
testing. It's a good idea to do all kinds of line blends and maybe some
triaxials etc to determine where your best melt is. You can also fire
tests of what's been recommended and if that works, go out for a beer and
take the rest of the day off.
I would aso caution that volumetric mixing of glazes can be highly
inaccurate. This has been discussed via Clayart many times before. Glaze
recipes that are generated from the molecular formula are meant to be
batched by weight. This is all figured out by the molecular weight of the
minerals and oxides used. If you do the mixing by volume you will be way
outta the Ball Park, especially if you are shooting for a eutectic.
regards, Craig Martell Hopewell, Oregon
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