Llewellyn Kouba on mon 25 feb 02
Can someone tell me what or (which one-number etc.) is a colemanite Frit?
see reference below. Thank you.
>BA240 - COLEMANITE
Insoluble form of boron i.e. a natural frit. Used in all types of glazes,
it also reduces the crazing tendencies. Develops opalescence typical of
boron compounds and in large quantities a broken mottled surface. The
effects can be variable and for consistency we suggest the use of colmanite
frit.
500 GMS1 KG5KGBAG (25 KGS)
3.586.1626.84123.31
Thank you
Llewellyn Kouba
Edouard Bastarache on tue 26 feb 02
Hello Llewellyn Kouba,
Ferro frit #3211 was known as a colemanite substitution frit.
Later,
Edouard Bastarache
Irreductible Quebecois
Indomitable Quebeker
Sorel-Tracy
Quebec
edouardb@sorel-tracy.qc.ca
http://sorel-tracy.qc.ca/~edouardb/
http://perso.wanadoo.fr/smart2000/index.htm
----- Original Message -----
From: Llewellyn Kouba
To:
Sent: Monday, February 25, 2002 10:58 PM
Subject: Colemanite Frit
> Can someone tell me what or (which one-number etc.) is a colemanite Frit?
> see reference below. Thank you.
>
> >BA240 - COLEMANITE
> Insoluble form of boron i.e. a natural frit. Used in all types of glazes,
> it also reduces the crazing tendencies. Develops opalescence typical of
> boron compounds and in large quantities a broken mottled surface. The
> effects can be variable and for consistency we suggest the use of
colmanite
> frit.
> 500 GMS1 KG5KGBAG (25 KGS)
> 3.586.1626.84123.31
>
> Thank you
> Llewellyn Kouba
>
>
____________________________________________________________________________
__
> Send postings to clayart@lsv.ceramics.org
>
> You may look at the archives for the list or change your subscription
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>
> Moderator of the list is Mel Jacobson who may be reached at
melpots@pclink.com.
Ababi on tue 26 feb 02
Hello Llewellyn.
Be awar of colemanite the spiting material!
About high B2O3 frits, with my expirience, above 30% in the frit, the
glaze crystalises after some time.
Why not Cadycal? Very similar The way I understood from Ron Roy, you
can use it as much as 10% of the recipe.
Ababi
---------- Original Message ----------
>Can someone tell me what or (which one-number etc.) is a colemanite
>Frit?
>see reference below. Thank you.
> >BA240 - COLEMANITE
>Insoluble form of boron i.e. a natural frit. Used in all types of
>glazes,
>it also reduces the crazing tendencies. Develops opalescence typical of
>boron compounds and in large quantities a broken mottled surface. The
>effects can be variable and for consistency we suggest the use of
>colmanite
>frit.
>500 GMS1 KG5KGBAG (25 KGS)
>3.586.1626.84123.31
>Thank you
>Llewellyn Kouba
>________________________________________________________________________
>______
>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.
BVCuma on wed 27 feb 02
> About high B2O3 frits,
> Why not Cadycal? Very similar > >
>BA240 - COLEMANITE
> >Insoluble form of boron i.e. a natural frit. Used in all types of
> >glazes,
The
> >effects can be variable and for consistency we suggest the use of
> >colmanite
> >frit.
_____________________________
Here is a method of making a non fritted
insoluable form of boron in colloidal suspension
ie. a fine particle substance which disperses
in water without settling or settles very slowly.
This reaction also forms colloidal ulexite
(Na2O-CaO-5B2O3-16 H2O)
So I feel it is a good source for
GB substitutions which contains the same (ulexite).
Materials 1530g Borax
170g Lime
300g Silica
6000g Water
Suspend ingredients into the water at 95 degrees in 2 1/2 gallon bucket.
Maintaining the temp at 86 degree and stirring every 2 hours till
the mixture remains suspended (aprox 8 hrs.)
The reaction is complete after 24 hrs.
The product will be a thick smooth paste
containing no hard course borax particles.
The resulting unity formula of this preparation
I do not know... can anyone tell me?
I use it as a glaze ingredient and as
a 1% addition to my clay body
for improved plasticity and sintering
when fired... it is also said to improve greenware strength.
Further you may produce a magnesium metaborate
by taking the previously reacted 18 pounds
sodium metaborate at 68 degrees
by adding 700 grams of magnesium sulphate
together with 1300 grams of water.
During stirring the magnesium sulphate
reacts immediately with the sodium metaborate
to produce a new colloidal precipitate...
magnesium metaborate
With a Unity of
0.167 Na2O 1.333B2O3 0.833 SiO2
0.333 CaO
0.500 MgO
This colloidal metaborate gives highly
thixotropic engobes, glaze suspensions,
and clay bodies.
( A thixotropic material is much more viscous
when left alone and when stirred becomes thinner)
Similarly with GB.
My limited experience with this compound
has yielded glaze crawling due to the high Magnesium.... I assume
Any ideas what additions or recipes might make for a balanced
glaze for these compounds?
I have tried the currie method on the sodium metaborate
working empirically with additions of lithium carbonate,
wood ash, China clay, k-feldspar, ball clay, silica...
and have had some good results.
From runny rivulets to mottled semi matt (crystals),
clear crazed/uncrazed and also opalescent effects
Any scientific insights most welcome
as I have for unknown reasons a strong
affinity to these self prepared and reacted formulas....
and plan to pursue extensive testing based on them.
Thanks,
Bruce
refer to Ceramic Monthly 1980
Colloidal Ulexates
by Bert Cool
for an in depth article on these and more preparations
based on borax/boron.
Ababi on thu 28 feb 02
I am trying to make the Israeli importers bring ulexite. They think I
am crazy. Yet I feel weird to import Turkish ulexite from the USA.
Tony Hansen wrote to this list, he wondered why this material, melted
in ^06. like water
Laguna have wrote me they test it now.
In 1980 I was painting and taking care of ducks geany pigs monkeys and
children. So I could not read the article. I can give you names of
contact people in Turkey, as well as Luxembourg. I belive if you want
to buy a sack, there will be no problem. If I understood correctly,
Tony Hansen, meant BIG SACK
Ababi Sharon
Kibbutz Shoval- Israel
Glaze addict
ababisha@shoval.org.il
http://members4.clubphoto.com/ababi306910/
http://www.milkywayceramics.com/cgallery/asharon.htm
http://www.israelceramics.org/
---------- Original Message ----------
>> About high B2O3 frits,
>> Why not Cadycal? Very similar > >
> >BA240 - COLEMANITE
>> >Insoluble form of boron i.e. a natural frit. Used in all types of
>> >glazes,
>The
>> >effects can be variable and for consistency we suggest the use of
>> >colmanite
>> >frit.
>_____________________________
>Here is a method of making a non fritted
>insoluable form of boron in colloidal suspension
>ie. a fine particle substance which disperses
>in water without settling or settles very slowly.
>This reaction also forms colloidal ulexite
>(Na2O-CaO-5B2O3-16 H2O)
>So I feel it is a good source for
>GB substitutions which contains the same (ulexite).
>Materials 1530g Borax
> 170g Lime
> 300g Silica
> 6000g Water
>Suspend ingredients into the water at 95 degrees in 2 1/2 gallon bucket.
>Maintaining the temp at 86 degree and stirring every 2 hours till
>the mixture remains suspended (aprox 8 hrs.)
>The reaction is complete after 24 hrs.
>The product will be a thick smooth paste
>containing no hard course borax particles.
>The resulting unity formula of this preparation
>I do not know... can anyone tell me?
>I use it as a glaze ingredient and as
>a 1% addition to my clay body
>for improved plasticity and sintering
>when fired... it is also said to improve greenware strength.
>Further you may produce a magnesium metaborate
>by taking the previously reacted 18 pounds
>sodium metaborate at 68 degrees
>by adding 700 grams of magnesium sulphate
>together with 1300 grams of water.
>During stirring the magnesium sulphate
>reacts immediately with the sodium metaborate
>to produce a new colloidal precipitate...
>magnesium metaborate
>With a Unity of
>0.167 Na2O 1.333B2O3 0.833 SiO2
>0.333 CaO
>0.500 MgO
>This colloidal metaborate gives highly
>thixotropic engobes, glaze suspensions,
>and clay bodies.
>( A thixotropic material is much more viscous
>when left alone and when stirred becomes thinner)
>Similarly with GB.
>My limited experience with this compound
>has yielded glaze crawling due to the high Magnesium.... I assume
>Any ideas what additions or recipes might make for a balanced
>glaze for these compounds?
>I have tried the currie method on the sodium metaborate
>working empirically with additions of lithium carbonate,
>wood ash, China clay, k-feldspar, ball clay, silica...
>and have had some good results.
>From runny rivulets to mottled semi matt (crystals),
>clear crazed/uncrazed and also opalescent effects
>Any scientific insights most welcome
>as I have for unknown reasons a strong
>affinity to these self prepared and reacted formulas....
>and plan to pursue extensive testing based on them.
>Thanks,
>Bruce
>refer to Ceramic Monthly 1980
>Colloidal Ulexates
>by Bert Cool
>for an in depth article on these and more preparations
>based on borax/boron.
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