Frances Howard on fri 4 jun 10
Our pottery group will probably be changing from ferro to fusion frits beca=
use of availability (or lack of), and we have a conversion chart to help. M=
ost of the chemicals look as though they are in similar ranges but the melt=
ing points are quite a lot different and we are wondering what to do about =
this. The differences are around 100F or in one case 150F. I've tried th=
e archives but haven't found much there about temperature. . Does it actual=
ly make any difference when mixed with the glaze or would it in fact make a=
big difference?
We haven't tested (we don't have the fusion frits yet) but can't help feeli=
ng that we can't ignore this. Has anyone used them I wonder and if so has =
this been a problem?
I'd be most grateful for any info on the temperatures etc if anyone has wo=
rked with them.
Many thanks Frances Howard
Lis Allison on sat 5 jun 10
On June 4, 2010, you wrote:
> Our pottery group will probably be changing from ferro to fusion frits
> because of availability (or lack of), and we have a conversion chart
> to help. Most of the chemicals look as though they are in similar
> ranges but the melting points are quite a lot different and we are
> wondering what to do about this. The differences are around 100F or
> in one case 150F. I've tried the archives but haven't found much
> there about temperature. . Does it actually make any difference when
> mixed with the glaze or would it in fact make a big difference?
The one problem I've run into is that the Fusion frits are more soluble in
water than the Ferro's were. This means that if you mix large quantities,
as I do, the glaze changes as you use it up. Now I mix more smaller
batches to add to the large batches, more often. A bit of a drag. And yes,
they are less 'melt-y'. Not a lot, but in a glaze with 25% frit, it is
noticeable.
Lis
--
Elisabeth Allison
Pine Ridge Studio
www.Pine-Ridge-Studio.blogspot.com
Ron Roy on sat 5 jun 10
Hi Frances,
As long as the analysis is close the frits will work the same in glazes.
Let me know if you need more specific information - I have analysis
for both Ferro and Fusion frits.
RR
Quoting Frances Howard :
> Our pottery group will probably be changing from ferro to fusion
> frits because of availability (or lack of), and we have a conversion
> chart to help. Most of the chemicals look as though they are in
> similar ranges but the melting points are quite a lot different and
> we are wondering what to do about this. The differences are around
> 100F or in one case 150F. I've tried the archives but haven't found
> much there about temperature. . Does it actually make any difference
> when mixed with the glaze or would it in fact make a big difference?
>
> We haven't tested (we don't have the fusion frits yet) but can't
> help feeling that we can't ignore this. Has anyone used them I
> wonder and if so has this been a problem?
>
> I'd be most grateful for any info on the temperatures etc if anyone
> has worked with them.
>
> Many thanks Frances Howard
>
Lili Krakowski on sat 5 jun 10
Frances asks:
"...... [C]hanging from Ferro to fusion frits .... [ H]ave a conversion =3D
chart to help. Most of the chemicals look as though they are in similar =3D
ranges but the melting points are quite a lot different and we are =3D
wondering what to do about this. "
Big Ceramic Store has an "exchange" chart on their site. And the Wm =3D
Hunt article mentioned had a very detailed one...The upshot however is =3D
that you have what you have and need to go with that. And John =3D
Hesselberth on Glaze Master (TM) gives the following substitutions: =3D
"Fusion F10/Ferro 3124; F12/ Ferro 3134; F 134/ Ferro 3292; F2/Ferro =3D
3195. I did not go through the whole list.
As said many a time--all our materials change...so the last batch of =3D
ball clay, or feldspar you got, under some commercial name is likely to =3D
be a bit different from what you got a few years ago. (According to Mr =3D
Isaacs of Hammill & Gillespie (and this years ago--a much missed lovely =3D
man) even frits actually change as what goes into THEM changes.)
As to the difference in given temp-- I cannot imagine much difference, =3D
seeing the comparisons above. I would test...but then I always test =3D
every new batch of glaze I make up anyway. =3D20
Of course glaze calculation will pinpoint it all...but I just would =3D
test, and adjust...and lettuce know what gives.=3D20
Lili Krakowski
Be of good courage
John Post on sun 6 jun 10
Instead of switching from Ferro to Fusion frits, I would simply look
for a new place to purchase the Ferro Frits I need.
If you are in the United States, you can get Ferro Frits from US
Pigment. http://www.uspigment.com/ Even with the cost of shipping,
Ferro Frits at US pigment are often priced lower than you can purchase
them locally.
I have both Ferro and Fusion frits that I use, but I use each frit for
different reasons. The frits I purchase from Fusion have no Ferro
equivalents.
John Post
Sterling Heights, Michigan
:: cone 6 glaze website :: http://www.johnpost.us
:: elementary art website :: http://www.wemakeart.org
:: youtube channel :: http://www.youtube.com/user/MrPostArtTeacher
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