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gf frit comparisons

updated mon 18 jan 99

 

Helen Stone on thu 14 jan 99

I see that Chris Schafale writes that he has found something about the
GF frits. He says his new local ceramic supplier -- who is this?-- has
a catalogue which shows GF-111 as comparable to Ferro 3134. I would
dearly love to know if this is true, also to know the hidden identity of
the frits GF-146, GF-154, and GF-156. General Color and Chemical in
Minerva, Ohio refuse to disclose the chemical contents of these frits
which they have sold to me. Their Material Safety Data Sheets do not
contain this information, only vague warnings about the nefarious
hazards awaiting the unsuspecting potter who touches them. I find this
secrecy is unwarranted and would like to know what is really in these
frits.

Can anyone out there help? Much thanks.

Evan Dresel on sat 16 jan 99

Seems straight forward to me. If they wont give you the information you
need to use their product, then they aren't worth dealing with. Like
their competitors couldn't figure it out! The only reason I can see for
not disclosing the composition is that they don't control it well enough
to put numbers to it -- also a good reason not to deal with them.

-- grumpy Evan in W. Richland WA where it's acting like it wants to
storm but probably won't.

Helen Stone wrote:
>
> ----------------------------Original message----------------------------
> I see that Chris Schafale writes that he has found something about the
> GF frits. He says his new local ceramic supplier -- who is this?-- has
> a catalogue which shows GF-111 as comparable to Ferro 3134. I would
> dearly love to know if this is true, also to know the hidden identity of
> the frits GF-146, GF-154, and GF-156. General Color and Chemical in
> Minerva, Ohio refuse to disclose the chemical contents of these frits
> which they have sold to me. Their Material Safety Data Sheets do not
> contain this information, only vague warnings about the nefarious
> hazards awaiting the unsuspecting potter who touches them. I find this
> secrecy is unwarranted and would like to know what is really in these
> frits.
>
> Can anyone out there help? Much thanks.

Kenn Burdick on sun 17 jan 99

Helen Stone and Evan Dresel,
I have found the unity molecular formula for Ferro Frit 3134 and GF 111 and =
they
are extremely close.
Na2O CaO B2O3 SiO2
Ferro 3134 .32 .68 .63 1.47
GF 111 .32 .68 .64 1.47

As far as the Fusion point and Coef. of expansion in this case also are the =
same
in my text. The text also says that the GF frits are not necessarily
interchangeable but may be in some cases. I think with these two it may be =
one
of those cases.
The fusion point is 1450 degrees Fahrenheit or cone 016. The Coef. of
expansion is 8.9. Don't know if all of this matters to you but, just trying=
to
be helpful. So far I have not seen any info on the other GF frits given.

Stefanie from NY