Tony Hansen on thu 6 apr 00
I have completely rewritten our page on Gerstley Borate and how to replace
it in
your glazes. I did calculation demos dozens of times at NCECA and got a
lot of feed back from people. I am working on a substitute and will be
meeting with
Borax suppliers later this month and should have much better information then.
The page is at http://digitalfire.com/education/material/gerstley.htm
All-in-all, the best solution is to learn how to replace it yourself, you
will have
unmatached enthusiasm and determination to fix your own glazes, all you need
is a little knowledge and direction.
====================================================
T o n y H a n s e n thansen@digitalfire.com
http://digitalfire.com Calculation/Database Software for Ceramic Industry
http://ceramicsearch.com Search engine for the Ceramic Industry
--
Report our performance to The Public Eye at
http://208.8.12.151/addcomments.cfm?&key=3606
====================================================
T o n y H a n s e n thansen@digitalfire.com
http://digitalfire.com Calculation/Database Software for Ceramic Industry
http://ceramicsearch.com Search engine for the Ceramic Industry
Jeremy/Bonnie Hellman on fri 7 apr 00
Tony, as usual your web site provides answers to questions I hadn't yet
thought to ask, and it gives me a broader range of knowledge than merely
"answering the question." Thank you again for writing this and sharing it.
Bonnie
Bonnie Hellman in Pittsburgh, PA
> From: Tony Hansen
> Reply-To: Ceramic Arts Discussion List
> Date: Thu, 6 Apr 2000 10:23:55 EDT
> To: CLAYART@LSV.UKY.EDU
> Subject: Gerstley Borate substitution
>
> ----------------------------Original message----------------------------
> I have completely rewritten our page on Gerstley Borate and how to replace
> it in
> your glazes. I did calculation demos dozens of times at NCECA and got a
> lot of feed back from people. I am working on a substitute and will be
> meeting with
> Borax suppliers later this month and should have much better information then.
> The page is at http://digitalfire.com/education/material/gerstley.htm
> All-in-all, the best solution is to learn how to replace it yourself, you
> will have
> unmatached enthusiasm and determination to fix your own glazes, all you need
> is a little knowledge and direction.
>
> ====================================================
> T o n y H a n s e n thansen@digitalfire.com
> http://digitalfire.com Calculation/Database Software for Ceramic Industry
> http://ceramicsearch.com Search engine for the Ceramic Industry
> --
> Report our performance to The Public Eye at
> http://208.8.12.151/addcomments.cfm?&key=3606
> ====================================================
> T o n y H a n s e n thansen@digitalfire.com
> http://digitalfire.com Calculation/Database Software for Ceramic Industry
> http://ceramicsearch.com Search engine for the Ceramic Industry
Bob Wicks on sat 8 apr 00
TONY:
You could not have given any better advice than to learn how to make
substitutions in making glaze changes on your own. I have been teaching this
in my classes and the students are proud of their achievements.
Somehow I have been missing the updates on INSIGHT. One of your sites keeps
telling me that it is no longer in use. My inquiry is when do you anticipate
a CD with the latest revisions?
Bob
Emily Pearlman on sun 14 may 00
Hi All:
FYI. So far, Ive tested 3 of my most used glazes with Frit 3195 instead of
Gerstley. There seems to be little difference, Ive just tested small
pieces. Next week I'll try a larger batch.
Emily
http://www.eppottery.com
Ron Roy on thu 25 may 00
Hi Emily,
I just did a theoretical glaze with 20 GB and directly substituted frit
3195. The molecular formulas are quite different - The fluxes and the boron
are close enough but there is substantially more alumina and silica.
This can be seen as an advantage because it improves the durability of the
glaze substantially.
the disadvantage is - it will be harder to melt and the expansion is
lowered somewhat. It would be wise to test your revision - if the expansion
is too low for your clay you might find it will crack pots under some
circumstances.
I was able to get it much closer by lowering the clay and the silica but
then there was a problem because there was so little clay left the glaze
would settle out too fast.
I usually recommend frit 3134 because there is no alumina in it and I can
then keep the raw clay in the recipe at higher levels to keep the glaze
suspended. Any GB glaze that Frit 3134 is subbed into will need other
adjustments by the way - sorry I can't give a simple answer - I will go a
step further - any material you sub in for GB should be checked if all
criteria are to be matched.
RR
>Hi All:
>FYI. So far, Ive tested 3 of my most used glazes with Frit 3195 instead of
>Gerstley. There seems to be little difference, Ive just tested small
>pieces. Next week I'll try a larger batch.
>
>Emily
>
>http://www.eppottery.com
Ron Roy
93 Pegasus Trail
Scarborough
Ontario, Canada
M1G 3N8
Evenings 416-439-2621
Fax 416-438-7849
Khaimraj Seepersad on thu 25 may 00
Good Day to All ,
Ron ,
Two questions - on the Tony Hansen site - Digital fire , there are
two frits that are near substitutes for G. Borate , are these
unavailable or too expensive ?
Secondly , is there no company , that couldn't just make an artificial
substitute as a frit - there are so many potters using the compound
and it is very easy to make for one's self ?
Also in Parmelee's book is a frit he has tested , that is similar to
G.B , why not just use that .
Khaimraj Seepersad
-----Original Message-----
From: Ron Roy
To: CLAYART@LSV.CERAMICS.ORG
Date: 25 May 2000 7:06
Subject: Re: Gerstley Borate substitution
>Hi Emily,
>
>I just did a theoretical glaze with 20 GB and directly substituted frit
>3195. The molecular formulas are quite different - The fluxes and the boron
>are close enough but there is substantially more alumina and silica.
>
>This can be seen as an advantage because it improves the durability of the
>glaze substantially.
>
>the disadvantage is - it will be harder to melt and the expansion is
>lowered somewhat. It would be wise to test your revision - if the expansion
>is too low for your clay you might find it will crack pots under some
>circumstances.
>
>I was able to get it much closer by lowering the clay and the silica but
>then there was a problem because there was so little clay left the glaze
>would settle out too fast.
>
>I usually recommend frit 3134 because there is no alumina in it and I can
>then keep the raw clay in the recipe at higher levels to keep the glaze
>suspended. Any GB glaze that Frit 3134 is subbed into will need other
>adjustments by the way - sorry I can't give a simple answer - I will go a
>step further - any material you sub in for GB should be checked if all
>criteria are to be matched.
>
>RR
>
>
>
>>Hi All:
>>FYI. So far, Ive tested 3 of my most used glazes with Frit 3195 instead
of
>>Gerstley. There seems to be little difference, Ive just tested small
>>pieces. Next week I'll try a larger batch.
>>
>>Emily
>>
>>http://www.eppottery.com
>
>Ron Roy
>93 Pegasus Trail
>Scarborough
>Ontario, Canada
>M1G 3N8
>Evenings 416-439-2621
>Fax 416-438-7849
>
>___________________________________________________________________________
___
>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.
>
Paul Gaskins on fri 23 jan 04
Hey,
I don't know the chemistry of what you are attempting, however, I have had
great success with Gillespie Borate, which is readily available in the
states. There are other substitutes out there and perhaps one of them might
be available in Poland (or maybe you can talk a local supplier into
importing it). Good luck.
Paul
----- Original Message -----
From: "mszaci"
To:
Sent: Thursday, February 04, 1904 3:03 AM
Subject: gerstley borate substitution
> Hi,
> My name is Maciej. I am from Poland, this is my first post on clayart.
> I have problem with gerstley borate substitute, because we dont have here
> local deposit, or calcium borate frit. My idea is to substitute it with
> boric acid and whiting. I have found it at
> members.aol.com/goodrichdn/index.htm in recipes section. There is a Brian
> Harper substitute boric acid 90.25 (soluble), whiting 48.69.
> My questions are :
> 1. Should I calcined(frit) it ( boric acid is soluble )
> 2. I am not good in chemistry, and I dont understand this proportions
> between boric acid and calcium carbonate( maybe Someone can explain me
that
> please?)
> 3. Is this good idea? It dont contain another component(GB have also
> ulexite, clay, quartz, and feldspar)
> Please help me
>
>
____________________________________________________________________________
__
> 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.
>
Ababi on sat 24 jan 04
Hello Maciej.
Can you order materials from Germany or Italy?
It will make it easier.
It is very hard to use boric acid. I wonder if the writer used it.
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: Clayart [mailto:CLAYART@LSV.CERAMICS.ORG] On Behalf Of mszaci
Sent: Thursday, February 04, 1904 10:04 AM
To: CLAYART@LSV.CERAMICS.ORG
Subject: gerstley borate substitution
Hi,
My name is Maciej. I am from Poland, this is my first post on clayart.
I have problem with gerstley borate substitute, because we dont have
here
local deposit, or calcium borate frit. My idea is to substitute it with
boric acid and whiting. I have found it at
members.aol.com/goodrichdn/index.htm in recipes section. There is a
Brian
Harper substitute boric acid 90.25 (soluble), whiting 48.69.
My questions are :
1. Should I calcined(frit) it ( boric acid is soluble )
2. I am not good in chemistry, and I dont understand this proportions
between boric acid and calcium carbonate( maybe Someone can explain me
that
please?)
3. Is this good idea? It dont contain another component(GB have also
ulexite, clay, quartz, and feldspar)
Please help me
________________________________________________________________________
______
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.
mszaci on sat 24 jan 04
Hi,
My name is Maciej. I am from Poland, this is my first post on clayart.
I have problem with gerstley borate substitute, because we dont have here
local deposit, or calcium borate frit. My idea is to substitute it with
boric acid and whiting. I have found it at
members.aol.com/goodrichdn/index.htm in recipes section. There is a Brian
Harper substitute boric acid 90.25 (soluble), whiting 48.69.
My questions are :
1. Should I calcined(frit) it ( boric acid is soluble )
2. I am not good in chemistry, and I dont understand this proportions
between boric acid and calcium carbonate( maybe Someone can explain me that
please?)
3. Is this good idea? It dont contain another component(GB have also
ulexite, clay, quartz, and feldspar)
Please help me
David Hewitt on mon 26 jan 04
Maciej,
'transporting' recipes from one potter to another has many hurdles to
get over if identical results are to be obtained. If the recipe contains
gerstley borate you have added problems in that the material has changed
over the years and so you really need to have an analysis of the
original recipe to know what you are trying to reformulate. Do you have
this? If not I would try to find another recipe that did not contain
gerstley borate.
If you did want to pursue using this recipe, you also need to have a
glaze calculation program to re-formulate the recipe with whatever
alternative materials you pick. If your local suppliers do not have a
calcium borate frit, or other frits, then I am sure that someone like
Bath Potters' Supplies would be happy to supply you. Try email
enquiries@bathpotters.co.uk
David
In message , mszaci writes
>Hi,
>My name is Maciej. I am from Poland, this is my first post on clayart.
> I have problem with gerstley borate substitute, because we dont have here
>local deposit, or calcium borate frit. My idea is to substitute it with
>boric acid and whiting. I have found it at
>members.aol.com/goodrichdn/index.htm in recipes section. There is a Brian
>Harper substitute boric acid 90.25 (soluble), whiting 48.69.
> My questions are :
>1. Should I calcined(frit) it ( boric acid is soluble )
>2. I am not good in chemistry, and I dont understand this proportions
>between boric acid and calcium carbonate( maybe Someone can explain me that
>please?)
>3. Is this good idea? It dont contain another component(GB have also
>ulexite, clay, quartz, and feldspar)
> Please help me
--
David Hewitt
David Hewitt Pottery
South Wales UK
Web:- http://www.dhpot.demon.co.uk
Logan Oplinger on mon 26 jan 04
On Thu, 4 Feb 1904 09:03:36 +0100, mszaci wrote:
>Hi,
>My name is Maciej. I am from Poland, this is my first post on clayart.
> I have problem with gerstley borate substitute, because we dont have here
>local deposit, or calcium borate frit. My idea is to substitute it with
>boric acid and whiting. I have found it at
>members.aol.com/goodrichdn/index.htm in recipes section. There is a Brian
>Harper substitute boric acid 90.25 (soluble), whiting 48.69.
> My questions are :
>1. Should I calcined(frit) it ( boric acid is soluble )
>2. I am not good in chemistry, and I dont understand this proportions
>between boric acid and calcium carbonate( maybe Someone can explain me that
>please?)
>3. Is this good idea? It dont contain another component(GB have also
>ulexite, clay, quartz, and feldspar)
> Please help me
Hello Maciej,
Welcome to Clayart. Poland is internationally well known for its fine
glass and ceramic products. I will suggest, if you have not already done
so, that you contact glass/ceramics manufacturers, or glass blowing/
ceramic artists in Poland. Calcium borate minerals and frits are commonly
used in the manufacture of glass. Other ceramic artists may be using
calcium borate frits or gerstly borate substitutes.
A manufacturer of glass or ceramics, or a glass artist may import borate
minerals or frits into Poland. They may be able to help you find a
supplier, or they may be able to sell to you some calcium borate frit. You
should also contact art institutes/universities, who may also be of help.
When I did a search for Polish glass/ceramics artists, I found the
following links:
http://www.galeria22.com.pl/eng/galeria/artists.html
Their home page is:
http://www.galeria22.com.pl/
Other sites:
http://clayzee.com/Art_and_Craft/Ceramic_Artists/Poland/
http://www.warsawvoice.pl/view/4247
http://republika.pl/ceramika_do/glowne-gal.htm
I wish you the best of luck.
Logan Oplinger
Another Tropical Island
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