Ababi on sat 22 nov 03
To be more honest (Can it be?) I add here my answer to RR questions
about my boro-single- paper -clay- firing.
To Ron You can read it again I fixed some mistakes in the letter I have
sent you earlier.
-----Original Message-----
From: Ababi [mailto:ababisha@shoval.org.il]
Sent: Saturday, November 22, 2003 3:57 AM
To: 'Ron Roy'
Subject: RE: FW: [0.0] Re: Single-paper-clay-glazing-answer to Ron
No I did not glaze the bottom of the wares..
About the firing.
Yehuda Koren offered me this shouldering for the bisque :Until 200C
the speed had to be 100C in an hour. From 200-500C speed of 200C in an
hour. At 250C close the peep hole at the top of the kiln. 500full
firing.
The manufacturer explained me that when the kiln reaches the 1000C or so
it slows down itself as it is hard for it to climb- in another word the
graph turns down a bit.
On the control panel of the kiln (Israeli made- the best in our market)
there is a button with numbers 1-8 and the next is maximum.
(Israeli made- the best in our market) I did: up to200C #5 1/2 on the
button
200 C- 500C 8.5# on the button than to maximum soaking 30 minutes on
top. Going down "almost your way- good isolation.
Now with paperclay I do the (bisque up to 1000C) this way: (So I did in
this single fire too up to 1220C)
The leatherhard work: Up to 80 C full heat and dried overnight.
From here to 150C #2 on the button.
150-200 #5C
200-300#6
300-400 #7
400-450#8
450-500C #8.5
at 500C I close the peep hole and fire full speed.
It is important to know that in 230C the paper is fired.
Only the big green Hanukah lamp has boron yet I spayed it thick actually
too thick -the glaze is more beautiful with less heavy application- I
thought more about you than on the ware- I wanted also to see if the raw
paperclay would not collapse.
First glaze thin application:
FOLLOW KOREN 27 2#
,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,
Cone 6 1201 deg.C. -
,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,
SILICA 31.50
Calcium Carbonate 12.00
ENGLISH KAOLIN CC31 13.50
ZINC OXIDE 10.00
Nepheline Syenite 10.00
STRONTIUM CARBONATE 7.00
FRIT 3110 16.00
,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,
Seger Weight%
KNO 0.182 5.13%
CaO 0.365 8.48%
MgO 0.001 0.01%
ZnO 0.327 11.02%
SrO 0.126 5.41%
Al2O3 0.204 8.61%
B2O3 0.016 0.46%
SiO2 2.443 60.87%
K2O 0.034 1.34%
Na2O 0.148 3.80%
Al:Si 11.99
Expan. 7.74
ST 367.64
,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,
second glaze heavy application:
I use Tony Hansen's latest analysis for G.B.
SPECKLED GREEN
,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,
Cone 6 1222 deg.C. -
,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,
Gerstley Borate 20.00
Nepheline Syenite 20.00
FRIT 3110 15.00
BALL CLAY AK 15.00
SILICA 30.00
Copper oxide black 5.00
Red Iron Oxide 1.50
Titanium Dioxide 5.00
,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,
Seger Weight%
KNO 0.418 6.60%
CaO 0.458 6.07%
MgO 0.124 1.18%
Al2O3 0.449 10.80%
B2O3 0.336 5.52%
SiO2 4.548 64.55%
TiO2 0.280 5.28%
K2O 0.063 1.40%
Na2O 0.355 5.20%
Al:Si 10.13
Expan. 7.48
ST 338.03
,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,
Hope it helps.
Ababi Sharon
Glaze addict
Kibbutz Shoval Israel
ababisha@shoval.org.il
http://members4.clubphoto.com/ababi306910
http://www.matrix2000.co.nz/Matrix%20Demo/Ababi.htm
| |
|
