Angela Davis on thu 5 jul 07
I am mixing up some matte green recipes and found one
I really wanted to try ( John's Frog Pond ) required FF 3124 which I don't
have on hand,
lots of 3134 though.
So thinking this would be a good chance to try my hand at glaze material
adjustment
I set about trying to figure out how to substitute the frits.
I read where 3124 is basically 3134 with alumina so I tried to get the SI:AL
ratio
close by adding ball clay and alumina and letting Glazemaster reset the
total to 100.
I then compared the limit ratios and they all were within range. I did try
fiddling with the
percentages of the other ingredients but got way out of whack so decided to
try something
simple.
What else should I have considered?
Angela Davis
The first is the adjusted recipe, the original is below it.
Recipe Name: Frog Pond Green Matte W/3134
Cone: 6 Color: light to med-dark green
Firing: Oxidation Surface: Matte
Amount Ingredient
28 Frit--Ferro 3134
21 Wollastonite
28.7 Kaolin--EPK
12.8 Silica
1.8 Alumina Hydrate
7.7 Ball Clay--Old Mine #4
100 Total
Additives
3.2 Copper Carbonate
5 Rutile
Unity Oxide
.151 Na2O
.006 K2O
.029 MgO
.813 CaO
1.000 Total
.445 Al2O3
.292 B2O3
.007 Fe2O3
2.831 SiO2
.007 TiO2
.001 P2O5
6.4 Ratio
6.9 Exp
Calculations by GlazeMasterT
www.masteringglazes.com
------------------------------------
Recipe Name: Frog Pond Green Matte
Cone: 6 Color: light to med-dark green
Firing: Oxidation Surface: Matte
Amount Ingredient
31 Frit--Ferro 3124
23.2 Wollastonite
31.7 Kaolin--EPK
14.1 Silica
100 Total
Additives
3.5 Copper Carbonate
5.5 Rutile
Unity Oxide
.11 Na2O
.012 K2O
.032 MgO
.846 CaO
1.000 Total
.505 Al2O3
.204 B2O3
.007 Fe2O3
3.225 SiO2
.004 TiO2
.001 P2O5
6.4 Ratio
6.5 Exp
Comments: Leach tested by John Hesselberth: Copper increased from 0.07 up
to 14.37 mg/l as copper carbonate levels was increased from 0.5% up to 5.0%.
Suggest holding copper carbonate to 2.0-3.5% where leaching was 0.14 and
4.73 mg/l respectively.
0.5% was pale yellow/green, 1.0 and 2.0 were attractive light greens, 3.5
and 5.0 were attractive medium to medium-dark greens.
-----------------------------------
Calculations by GlazeMasterT
www.masteringglazes.com
------------------------------------
Ron Roy on thu 5 jul 07
Hi Angela,
You need to match up the fluxes and boron first - then adjust the alumina
and silica. Adjust the frit first to get the same amount of boron as in the
original. I added a bit more to help the melt because there is only 19%
frit in the revision compared to 31% in the original.
Here is what is should look like - a lot of clay though so maybe adding
some alumina will help but it is hard to melt. It would be better to
calcine some of the clay to cut down on shrinkage if it's a problem.
Wollastonite........ 24.50
EPK................. 39.50
SILICA.............. 17.00
F3134............... 19.00
----------
100.00
FORMULA & ANALYSIS
------------------
*CaO........ .85 15.14%
*MgO........ .03 .44%
*K2O........ .01 .17%
*Na2O....... .11 2.18%
Fe2O3...... .01 .40%
TIO2....... .00 .13%
B2O3....... .21 4.68%
AL2O3...... .50 16.29%
SiO2....... 3.18 60.53%
P2O5....... .00 .05%
RATIO 6.32
EXPAN 374.19
WEIGHT 314.83
RR
>I am mixing up some matte green recipes and found one
>I really wanted to try ( John's Frog Pond ) required FF 3124 which I don't
>have on hand,
>lots of 3134 though.
>
>So thinking this would be a good chance to try my hand at glaze material
>adjustment
>I set about trying to figure out how to substitute the frits.
>
>I read where 3124 is basically 3134 with alumina so I tried to get the SI:AL
>ratio
>close by adding ball clay and alumina and letting Glazemaster reset the
>total to 100.
>
>I then compared the limit ratios and they all were within range. I did try
>fiddling with the
>percentages of the other ingredients but got way out of whack so decided to
>try something
>simple.
>
>What else should I have considered?
>
>Angela Davis
>
>The first is the adjusted recipe, the original is below it.
>
>Recipe Name: Frog Pond Green Matte W/3134
>
>Cone: 6 Color: light to med-dark green
>Firing: Oxidation Surface: Matte
>
>Amount Ingredient
>28 Frit--Ferro 3134
>21 Wollastonite
>28.7 Kaolin--EPK
>12.8 Silica
>1.8 Alumina Hydrate
>7.7 Ball Clay--Old Mine #4
>
>100 Total
>
> Additives
>3.2 Copper Carbonate
>5 Rutile
>
>Unity Oxide
>.151 Na2O
>.006 K2O
>.029 MgO
>.813 CaO
>1.000 Total
>
>.445 Al2O3
>.292 B2O3
>.007 Fe2O3
>
>2.831 SiO2
>.007 TiO2
>.001 P2O5
>
>6.4 Ratio
>6.9 Exp
>
>Calculations by GlazeMasterT
>www.masteringglazes.com
>------------------------------------
>
>Recipe Name: Frog Pond Green Matte
>
>Cone: 6 Color: light to med-dark green
>Firing: Oxidation Surface: Matte
>
>Amount Ingredient
>31 Frit--Ferro 3124
>23.2 Wollastonite
>31.7 Kaolin--EPK
>14.1 Silica
>
>100 Total
>
> Additives
>3.5 Copper Carbonate
>5.5 Rutile
>
>Unity Oxide
>.11 Na2O
>.012 K2O
>.032 MgO
>.846 CaO
>1.000 Total
>
>.505 Al2O3
>.204 B2O3
>.007 Fe2O3
>
>3.225 SiO2
>.004 TiO2
>.001 P2O5
>
>6.4 Ratio
>6.5 Exp
>
>Comments: Leach tested by John Hesselberth: Copper increased from 0.07 up
>to 14.37 mg/l as copper carbonate levels was increased from 0.5% up to 5.0%.
>Suggest holding copper carbonate to 2.0-3.5% where leaching was 0.14 and
>4.73 mg/l respectively.
>
>0.5% was pale yellow/green, 1.0 and 2.0 were attractive light greens, 3.5
>and 5.0 were attractive medium to medium-dark greens.
>-----------------------------------
>Calculations by GlazeMasterT
>www.masteringglazes.com
>------------------------------------
>
>______________________________________________________________________________
>Send postings to clayart@lsv.ceramics.org
>
>You may look at the archives for the list or change your subscription
>settings from http://www.ceramics.org/clayart/
>
>Moderator of the list is Mel Jacobson who may be reached at melpots@pclink.com.
> owner-claya
Ron Roy
RR#4
15084 Little Lake Road
Brighton, Ontario
Canada
K0K 1H0
| |
|
