Cameron Ray on fri 5 jun 98
Fusion frit No. F309 appears to be the only frit formulated to
approximately match Gerstley Borate. It is stable, consistant and
requires little, if any, modification to existing glaze formulae.
J.M.Ray
Tony Hansen on sun 7 jun 98
MATERIAL: FRIT F-309
SUPPLIER: FUSION CERAMICS
RAW WEIGHT: 139.20
ANALYSIS & UNITY FORMULA
========================
CaO....... 22.00% 0.55
MgO....... 5.00% 0.17
Na2O...... 7.00% 0.16
B2O3...... 50.00% [ 1.00]
Al2O3..... 3.00% 0.04
SiO2...... 13.00% 0.30
======
100.00
Although this frit has a similar amount of B2O3 to Gerstley, it is
quite different otherwise.
--
T o n y H a n s e n thansen@digitalfire.com
Don't fight the dragon alone http://digitalfire.com
Calculation/Database Software for Ceramic Industry
Ron Roy on mon 8 jun 98
Good to know JM,
Here are the relative calculations of my current GB and F309 analysis. As
you can see there is enough difference that it would be wise to substitute
on a molecular level if you have that option. I have found Ferro 3134
useful but again it is most advisable to do it mol for mol.
Gers Borate 9/97.... 30.00 100.00%
----------
30.00
FORMULA & ANALYSIS
------------------
*CaO........ .37 27.45%
*MgO........ .11 6.03%
*K2O........ .00 .55%
*Na2O....... .08 6.18%
Fe2O3...... .00 .69%
*B2O3....... .43 39.86%
AL2O3...... .02 2.35%
SiO2....... .21 16.89%
RATIO 12.23
EXPAN 511.53
WEIGHT 75.92
----------------------------------------------------------------------------
--------
F 309............... 30.00 100.00%
----------
30.00
FORMULA & ANALYSIS
------------------
*CaO........ .29 22.00%
*MgO........ .09 5.00%
*K2O........
*Na2O....... .08 7.00%
Fe2O3......
*B2O3....... .53 50.00%
AL2O3...... .02 3.00%
SiO2....... .16 13.00%
RATIO 7.37
EXPAN 356.50
WEIGHT 74.21
>----------------------------Original message----------------------------
>Fusion frit No. F309 appears to be the only frit formulated to
>approximately match Gerstley Borate. It is stable, consistant and
>requires little, if any, modification to existing glaze formulae.
>J.M.Ray
Ron Roy
93 Pegasus Trail
Scarborough, Ontario
Canada M1G 3N8
Tel: 416-439-2621
Fax: 416-438-7849
Web page: http://digitalfire.com/education/people/ronroy.htm
Ron Roy on mon 8 jun 98
Hi Tony - well I have sent you the correct analysis for GB three times now
- it only has 40% boron (fired) - see my post I have already sent to
clayart - yesterday.
This is straight from Hammil and Gillespie lst year.
Gers Borate 9/97 copy
---------------------
B2O3................ 27.68 39.86%
Na2O................ 4.29 6.18%
SiO2................ 11.73 16.89%
Fe2O3............... .48 .69%
AL2O3............... 1.63 2.35%
MgO................. 4.19 6.03%
CaO................. 19.06 27.45%
K2O................. .38 .55%
----------
69.44
FORMULA & ANALYSIS
------------------
*CaO........ .37 19.39%
*MgO........ .11 4.26%
*K2O........ .00 .39%
*Na2O....... .08 4.36%
Fe2O3...... .00 .49%
*B2O3....... .43 28.16%
AL2O3...... .02 1.66%
SiO2....... .21 11.93%
L.O.I. 29.35
RATIO 12.23
EXPAN 511.53
WEIGHT 107.46
>----------------------------Original message----------------------------
>MATERIAL: FRIT F-309
> SUPPLIER: FUSION CERAMICS
> RAW WEIGHT: 139.20
>
> ANALYSIS & UNITY FORMULA
> ========================
> CaO....... 22.00% 0.55
> MgO....... 5.00% 0.17
> Na2O...... 7.00% 0.16
> B2O3...... 50.00% [ 1.00]
> Al2O3..... 3.00% 0.04
> SiO2...... 13.00% 0.30
> ======
> 100.00
>
>Although this frit has a similar amount of B2O3 to Gerstley, it is
>quite different otherwise.
>
>--
>T o n y H a n s e n thansen@digitalfire.com
>Don't fight the dragon alone http://digitalfire.com
>Calculation/Database Software for Ceramic Industry
Ron Roy
93 Pegasus Trail
Scarborough, Ontario
Canada M1G 3N8
Tel: 416-439-2621
Fax: 416-438-7849
Web page: http://digitalfire.com/education/people/ronroy.htm
Nadine Scott on tue 6 jun 00
I am interested in hearing from any potters who have found successful
substitution material for the now extinct Gerstley Borate. Several potters
I have spoken to have tried colemanite now being offered and have not been
very satisfied. The results were a dull glaze without the shine of the
previous gerstley version. My concern in testing and switching to
colemanite is that we will face the same dilemma in the near future since
colemanite was previously discontinued. That leads us to frits...
I am firing cone 6 stoneware and would appreciate any help since the
majority of my favorite glazes all have at least 23% Gerstley!
Jim Bozeman on wed 7 jun 00
Daven's Ceramics in Atlanta carries a substitute called Laguna borate. I
haven't tried it yet though. I use about 2% gerstley borate in my glaze so I
might just switch to using a frit instead. Jim
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Diane G. Echlin on wed 7 jun 00
Hi Nadine,
I have recently begun testing ^6 Floating Blue (check the archives for REAMS of
info on it) using Laguna Borate as a Gerstley substitute. So far only one test
batch, and it was disappointing, but Jon Paccini (did I butcher your name Jon?)
from Laguna has been helping me out a lot with trying to tweak the formula. He
seems genuinely interested in making this new sub work. Also, I have used LB in
some of my raku glazes, and although I've had to add bentonite to help with
application, the results have been fabulous. I'll be trying some Murray's Borate
from Kickwheel soon, when my sample arrives.
Good luck!
Di
Nadine Scott wrote:
> I am interested in hearing from any potters who have found successful
> substitution material for the now extinct Gerstley Borate. Several potters
> I have spoken to have tried colemanite now being offered and have not been
> very satisfied. The results were a dull glaze without the shine of the
> previous gerstley version. My concern in testing and switching to
> colemanite is that we will face the same dilemma in the near future since
> colemanite was previously discontinued. That leads us to frits...
> I am firing cone 6 stoneware and would appreciate any help since the
> majority of my favorite glazes all have at least 23% Gerstley!
>
> ______________________________________________________________________________
> Send postings to clayart@lsv.ceramics.org
>
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>
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thansen@DIGITALFIRE.COM on thu 8 jun 00
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> I am interested in hearing from any potters who have found successful
> substitution material for the now extinct Gerstley Borate. Several potters
> I have spoken to have tried colemanite now being offered and have not been
> very satisfied. The results were a dull glaze without the shine of the
> previous gerstley version. My concern in testing and switching to
> colemanite is that we will face the same dilemma in the near future since
> colemanite was previously discontinued. That leads us to frits...
> I am firing cone 6 stoneware and would appreciate any help since the
> majority of my favorite glazes all have at least 23% Gerstley!
Check this web page:
http://digitalfire.com/education/material/gerstleyborate.htm
Recently updated. More updates coming soon.
--
====================================================
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
--
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LJTCW@AOL.COM on thu 8 jun 00
<< I am interested in hearing from any potters who have found successful
substitution material for the now extinct Gerstley Borate >>
I have been testing Murray's Borate and Laguna Borate in my ^6 glazes. There
have been subtle differences in some glazes, drastic in others. Laguna seems
to work better for me but did change the color in my favorite blue, perhaps
for the better. Laguna also seems to have more ingredients that Murray's.
More testing to do.
Louise
Louise Jenks
Cincinnati OH USA
LJTCW@AOL.COM
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