Ababi on sun 7 dec 03
Hello Ron and Linda and ClayArters too!
The sad point is that my kiln has to be fixed.
The good point is that it has stopped in 1068C therefore we know what
happens around ^04.
The fire might have been even slower than the way I have written in my
earlier letter.
I knew something wrong with my kiln therefore I was in the studio during
the 1000C and high.
I made this glaze thick applied twice on a piece of raw paperclay.
Only the bottom was unglazed
HIGH BORON GLAZE
,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,
Cone 6 1222 deg.C. -
,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,
SOFT BORAX FRIT (BATH) 40.00
frit 3124 40.00
kaolin CC31 20.00
,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,
Seger Weight%
KNO 0.525 9.85%
CaO 0.475 7.79%
Al2O3 0.383 11.41%
B2O3 0.906 18.45%
SiO2 2.987 52.49%
TiO2 0.001 0.02%
K2O 0.034 0.94%
Na2O 0.491 8.91%
Al:Si 7.80
Expan. 8.41
ST 290.40
,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,
I made a big picture to be able to see how it behaves.
http://members4.clubphoto.com/ababi306910/1471260/
When my kiln will be repaired I shall fire it to ^6 and will upload it
again
By the way, Ron. Your gloss liner my version started to be glossy.
Because it was on a child's work I did not test it farther.
Ababi Sharon
Glaze addict
Kibbutz Shoval Israel
ababisha@shoval.org.il
http://ababi.active.co.il
http://www.matrix2000.co.nz/Matrix%20Demo/Ababi.htm
-----Original Message-----
From: Ron Roy [mailto:ronroy@total.net]
Sent: Sunday, November 23, 2003 7:48 PM
To: CLAYART@LSV.CERAMICS.ORG
Cc: ababisha@shoval.org.il
Subject: Single-paper-clay-glazing-answer to Ron
Hi Ababi,
Thanks for this - you should turn off HTML - turn on plain text by the
way.
Both glazes have little boron.
Remember what I said - to the question - any problems single firing
glazes
on paper clay to cone 6?
I said - could be with high boron glazes because they seal over faster
and
if the carbon is not gone it will be a mess.
If to cone 04 then it will be more difficult.
RR
>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
Ron Roy
RR#4
15084 Little Lake Road
Brighton, Ontario
Canada
K0K 1H0
Phone: 613-475-9544
Fax: 613-475-3513
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