Mary Day Wollheim on thu 13 jan 00
Can any UK Clayart members tell me what Frit I can get here to
substitute for Ferro 3134? I VERY much want to try Ron Roy's black Cone 6
glaze. Potclays have a Ferro frit (which they call Ferro Crystal Frit; it's
Potclays no. 2266 ) but they don't know the Ferro number and say that Ferro
won't give them the formula. They sent me the analyses for their own frits,
but none of them seemed near to the analysis I had for 3134; [Na2O=10.3;
CaO=20.1; B2O3=23.1; SiO2=46.5]
Potterycrafts catalogue only gives molecular formulas and none of their
frits seemed to have the same ingredients.
Also: to substitute for EPK, should it be a kaolin with a slightly higher
or a lower proportion of SiO2?
I have looked in the Index but couldn't seem to find these answers
(although many other useful things appeared - of course ).
Many thanks in advance for any help,
Mary-Day (in London)
CINDI ANDERSON on fri 14 jan 00
Close substituions for Ferro 3134 are:
GENERAL GF-111
PEMCO MOBAY BAYER P-54
FUSION F-12
O.HOMMEL 14
Don't know if this means anything to you over there or not, but I hope
it helps.
Cindi
Our FRIT substitution chart is at
http://www.bigceramicstore.com/Information/frit_comparisons.htm
Mary Day Wollheim wrote:
>
> ----------------------------Original message----------------------------
> Can any UK Clayart members tell me what Frit I can get here to
> substitute for Ferro 3134? I VERY much want to try Ron Roy's black Cone 6
> glaze. Potclays have a Ferro frit (which they call Ferro Crystal Frit; it's
> Potclays no. 2266 ) but they don't know the Ferro number and say that Ferro
> won't give them the formula. They sent me the analyses for their own frits,
> but none of them seemed near to the analysis I had for 3134; [Na2O=10.3;
> CaO=20.1; B2O3=23.1; SiO2=46.5]
> Potterycrafts catalogue only gives molecular formulas and none of their
> frits seemed to have the same ingredients.
> Also: to substitute for EPK, should it be a kaolin with a slightly higher
> or a lower proportion of SiO2?
> I have looked in the Index but couldn't seem to find these answers
> (although many other useful things appeared - of course ).
> Many thanks in advance for any help,
> Mary-Day (in London)
Wade Blocker on fri 14 jan 00
----------
> From: Mary Day Wollheim
> To: CLAYART@LSV.UKY.EDU
> Subject: UK substitutions
> Date: Thursday, January 13, 2000 2:37 PM
>
> ----------------------------Original message----------------------------
> Can any UK Clayart members tell me what Frit I can get here to
> substitute for Ferro 3134? I VERY much want to try Ron Roy's black Cone
6
> glaze. Potclays have a Ferro frit (which they call Ferro Crystal Frit;
it's
> Potclays no. 2266 ) but they don't know the Ferro number and say that
Ferro
> won't give them the formula. They sent me the analyses for their own
frits,
> but none of them seemed near to the analysis I had for 3134; [Na2O=10.3;
> CaO=20.1; B2O3=23.1; SiO2=46.5]
> Potterycrafts catalogue only gives molecular formulas and none of
their
> frits seemed to have the same ingredients.
> Also: to substitute for EPK, should it be a kaolin with a slightly
higher
> or a lower proportion of SiO2?
> I have looked in the Index but couldn't seem to find these answers
> (although many other useful things appeared - of course ).
> Many thanks in advance for any help,
> Mary-Day (in London)
Dear Mary,
Emmanuel Cooper in his book of glaze recipes gives the following
British equivalent for Ferro
3l34 frit: Borax fritP2957 Pottery Crafts Ltd. For EPK he just lists China
Clay(Al2O3,2SiO2,2H2O)
Hope this helps. Mia in sunny Albuquerque.
David Hewitt on fri 14 jan 00
Hello Mary-Day,
The nearest substitutes for Ferro 3134 that I know of are Pottery Crafts
P2953 or Bath Potters' Supplies Standard Borax Frit. They are not exact
equivalents and so one really should adjust the other components of the
recipe to match the required analysis. Data on these is shown in the
current issue of Ceramic Review (Issue 181) who have published an
article of mine on 'Transporting Glazes'. This also refers to many of
the other pitfalls you may encounter when trying to reproduce others
glazes from a recipe.
If you do not have access to this issue of Ceramic Review you can also
see a version of this article on my web site under 'Pottery Techniques /
Transporting Glazes'.
http://www.dhpot.demon.co.uk
This article also includes data on china clay including EPK. I use the
china clay from Bath Potters' Supplies which is Puraflo 50. It is quite
close to EPK but, as for the frit, some re-formulation should be made to
cater for the difference.
If you do not have access to a glaze calculation program, please write
to me off list with the recipe and I will run out a recipe using the UK
alternatives.
David
In message , Mary Day Wollheim writes
>----------------------------Original message----------------------------
> Can any UK Clayart members tell me what Frit I can get here to
>substitute for Ferro 3134? I VERY much want to try Ron Roy's black Cone 6
>glaze. Potclays have a Ferro frit (which they call Ferro Crystal Frit; it's
>Potclays no. 2266 ) but they don't know the Ferro number and say that Ferro
>won't give them the formula. They sent me the analyses for their own frits,
>but none of them seemed near to the analysis I had for 3134; [Na2O=10.3;
>CaO=20.1; B2O3=23.1; SiO2=46.5]
> Potterycrafts catalogue only gives molecular formulas and none of their
>frits seemed to have the same ingredients.
> Also: to substitute for EPK, should it be a kaolin with a slightly higher
>or a lower proportion of SiO2?
> I have looked in the Index but couldn't seem to find these answers
>(although many other useful things appeared - of course ).
> Many thanks in advance for any help,
> Mary-Day (in London)
>
--
David Hewitt
David Hewitt Pottery ,
7 Fairfield Road, Caerleon, Newport,
South Wales, NP18 3DQ, UK. Tel:- +44 (0) 1633 420647
FAX:- +44 (0) 870 1617274
Own Web site http://www.dhpot.demon.co.uk
IMC Web site http://digitalfire.com/education/people/hewitt.htm
Ron Roy on tue 18 jan 00
Hi Mary Day,
Get me an analysis for a local frit with 20 to 25% boron, some calcium,
sodium and silica - little or no alumina - and I will convert for you.
Most of the kaolins are very close to each other - grolleg will work fine.
Go to David Hewitts web page - he has some info posted there which will
help perhaps.
David Hewitt:david@dhpot.demon.co.uk
This is not that complicated - all I need is an analysis for a frit with
enough boron and little alumina - you do the test firing and I will do the
revisions and you will post the results to ClayArt.
RR
>----------------------------Original message----------------------------
> Can any UK Clayart members tell me what Frit I can get here to
>substitute for Ferro 3134? I VERY much want to try Ron Roy's black Cone 6
>glaze. Potclays have a Ferro frit (which they call Ferro Crystal Frit; it's
>Potclays no. 2266 ) but they don't know the Ferro number and say that Ferro
>won't give them the formula. They sent me the analyses for their own frits,
>but none of them seemed near to the analysis I had for 3134; [Na2O=10.3;
>CaO=20.1; B2O3=23.1; SiO2=46.5]
> Potterycrafts catalogue only gives molecular formulas and none of their
>frits seemed to have the same ingredients.
> Also: to substitute for EPK, should it be a kaolin with a slightly higher
>or a lower proportion of SiO2?
> I have looked in the Index but couldn't seem to find these answers
>(although many other useful things appeared - of course ).
> Many thanks in advance for any help,
> Mary-Day (in London)
Ron Roy
93 Pegasus Trail
Scarborough
Ontario, Canada
M1G 3N8
Evenings 416-439-2621
Fax 416-438-7849
Mary Day Wollheim on wed 19 jan 00
Thank you all for the really helpful responses to my question. Ron, I
did get in touch with DavidHewitt, and he is going to calculate your glaze
for me, in terms of what I can get here. I would imagine that this would be
useful to many people besides me.Or perhaps everyone does their own
calculations by now.[ It does seem strange that there is no exact equivalent
for a commonly used substance, in 2 these closely related places. ( as with
sizes of screw, voltage requirements ... computer software...)] The US
materials seem to be available in Canada; but not here, and vice versa.
It is interesting, Mia, that Cooper (who I think is English?) suggests
Potterycrafts 2957 for Ferro 3134,while David Hewitt and Tom Buck say 2953.;
but as Tom says, they are too dissimilar to do a direct substitution. Anyway
many thanks to you all.
Mary-Day in London
Ron Roy on thu 20 jan 00
Hi Mary,
It would be very helpful if someone would post the analysis of the UK frits
- I could then make my own suggestions as to how to do my glaze with them -
R
>----------------------------Original message----------------------------
> Thank you all for the really helpful responses to my question. Ron, I
>did get in touch with DavidHewitt, and he is going to calculate your glaze
>for me, in terms of what I can get here. I would imagine that this would be
>useful to many people besides me.Or perhaps everyone does their own
>calculations by now.[ It does seem strange that there is no exact equivalent
>for a commonly used substance, in 2 these closely related places. ( as with
>sizes of screw, voltage requirements ... computer software...)] The US
>materials seem to be available in Canada; but not here, and vice versa.
>It is interesting, Mia, that Cooper (who I think is English?) suggests
>Potterycrafts 2957 for Ferro 3134,while David Hewitt and Tom Buck say 2953.;
>but as Tom says, they are too dissimilar to do a direct substitution. Anyway
>many thanks to you all.
> Mary-Day in London
Ron Roy
93 Pegasus Trail
Scarborough
Ontario, Canada
M1G 3N8
Evenings 416-439-2621
Fax 416-438-7849
mary simmons on fri 21 jan 00
Ron--
I would post analysis of UK frits, if I knew what they are--If they have
not been analyzed I can do that. HOWEVER, my use of the chem lab is
getting conspicuous, so I'll need some $$$ help if people want this done.
We've made the boron standards.......and today I am analyzing cadycal, will
post THAT later today or monday.....
Mary
At 06:32 PM 1/20/00 EST, you wrote:
>----------------------------Original message----------------------------
>Hi Mary,
>
>It would be very helpful if someone would post the analysis of the UK frits
>- I could then make my own suggestions as to how to do my glaze with them -
>R
David Hewitt on sun 23 jan 00
Ron,
You can get a good selection of Potclays and Potterycraft frits from the
Frank Gaydos site
http://members.xoom.com/fgaydos/index.html
or through my site, 'Pottery Techniques / Transporting Glazes'.
http://www.dhpot.demon.co.uk
My site also has a link to the Frank Gaydos site under 'Links'.
David
In message , Ron Roy writes
>----------------------------Original message----------------------------
>Hi Mary,
>
>It would be very helpful if someone would post the analysis of the UK frits
>- I could then make my own suggestions as to how to do my glaze with them -
>R
>
>Ron Roy
>93 Pegasus Trail
>Scarborough
>Ontario, Canada
>M1G 3N8
>Evenings 416-439-2621
>Fax 416-438-7849
>
--
David Hewitt
David Hewitt Pottery ,
7 Fairfield Road, Caerleon, Newport,
South Wales, NP18 3DQ, UK. Tel:- +44 (0) 1633 420647
FAX:- +44 (0) 870 1617274
Own Web site http://www.dhpot.demon.co.uk
IMC Web site http://digitalfire.com/education/people/hewitt.htm
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