Ababi on thu 18 oct 01
These two recipes based on the same frit, 3701 Here are some words
about this frits;
JOHNSON MATTHEY
Holland
********************************************
SEGER FORMULAE
1.00 NA+K2O+LI2O
2.86 SiO2
1.99 B2O3
***************************************
CHEMICAL ANALYSIS
Na2O / K2O / Li2O 16.6 %
SiO2 46%
B2O3 37.3%
***************************************
REMARKS
An alkaline frit sepsaly developed to cover a large of aplications, frit
3701is silghtly soulble....
First to explain myself. When I plan a glaze I know exactly why I chose
gleason ball clay and not Ball clay AK. But now, two days later it is a
bit hard to explain.
Mainly this recipe follows the many lichen recipes I tested in ^6. I
believe it may lead you to other cones beads too.
Raku Beads
==========
GLEASON BALL CLAY.... 10.00 9.35%
MAGNESIUM CARBONATE. 30.00 28.04%
FRIT 3701........... 60.00 56.07%
+tsp................. 5.00 4.67%
+BENTONITE........... 2.00 1.87%
========
107.00
CaO 0.01* 0.19%
Li2O 0.09* 1.49%
MgO 0.66* 15.38%
K2O 0.04* 2.44%
Na2O 0.20* 7.33%
SrO 0.00* 0.08%
TiO2 0.00 0.20%
Al2O3 0.06 3.63%
B2O3 0.68 27.34%
SiO2 1.20 41.75%
Fe2O3 0.00 0.17%
Si:Al 19.52
SiB:Al 30.56
Expan 6.77
How to convert it? I would take 10 ball clay
30 magnesium carbonate
2 bentonite
60 your favorite raku frit
The TSP here is to avoid crystallization of the B2O3 and the Lithium in
this frit.
Looked good above Loess body
My raku glaze.
Based on a glaze I used before. the main idea here is to break a part
the idea of 85 % borax frit + 15 kaolin
and from the other hand the one I used before 70% frit with a little
alumina+ 30% wolastonite, and create a glaze with both ways:
Am I clear?
My Raku Glaze
=============
FRIT 3701........... 75.00 75.00%
WHITING............. 12.00 12.00%
ENGLISH KAOLIN CC31. 13.00 13.00%
========
100.00
CaO 0.37* 7.23%
Li2O 0.16* 1.66%
K2O 0.09* 3.10%
Na2O 0.38* 8.16%
TiO2 0.00 0.01%
Al2O3 0.14 4.98%
B2O3 1.25 30.45%
SiO2 2.11 44.31%
Fe2O3 0.00 0.11%
Text1 27.09
Si:Al 15.10
SiB:Al 24.07
Expan 8.19
Looks simple? yes after more than 100 real life tests.
Looks good on VC raku test tile
The interesting Idea of this frit is the <1.00 NA+K2O+LI2O>
Ababi Sharon
Kibbutz Shoval- Israel
Glaze addict
sharon@shoval.org.il
http://members4.clubphoto.com/ababi306910/
http://www.milkywayceramics.com/cgallery/asharon.htm
http://www.israelceramics.org/
| |
|
