Bill Aycock on wed 11 feb 98
A few months back, I came across mention of General Color as a supplier of
frits and stains. I requested a description of their Frits, because I had
seen a formulation (without analysis) that used one of theirs.
Within a few weeks, I got a brochure from them, giving lists of leadless
and leaded frits and color materials. These lists were, largely,
rudimentary descriptions, (eg; "Sodium-Calcium Borosilicate", and
"Zinc-bearing"), and were on little use to me.
Later, I got e-mail from one of their staff, offering to send me a copy of
their literature ( that I had already received) if I would send my
Snail-mail address. His letter told me that they DO NOT publish their
formulations. Since that was what I really wanted, to use in formulation
calculations ( Insight), I have thanked him and told him goodbye.
Inquiring minds want to know; I thought you would too.
Bill- waiting for the last of todays clayart before going to work, on
Persimmon Hill
Bill Aycock --- Persimmon Hill
Woodville, Alabama, US 35776
(in the N.E. corner of the State)
W4BSG -- Grid EM64vr
baycock@HiWAAY.net
Tony Hansen on fri 13 feb 98
>A few months back, I came across mention of General Color as a supplier of
>frits and stains. I requested a description of their Frits, because I had
>seen a formulation (without analysis) that used one of theirs.
>...His letter told me that they DO NOT publish their
>formulations.
In recent years some frit companies, such as Fusion Ceramics, freely
supplied the chemical analysis of their frits. Others, such as Ferro
who were forthcoming with data in the past, have been more guarded and
either provide no chemistry or approximate analyses. There is now a
situation of 'legal chill' in the industry because of law suits against
the frit manufacturers for deviance of their products from the published
formulas. Now most companies are hesitant to supply formula data. Since
most standard frits have been made for many years users are doing
'intelligence work' to get the formulas by finding them in older
magazines
and books and by deducing them from charts of equivalent frits from
different manufacturers.
I have many hundreds of formulas. All you need is an equivalence chart
and I can give
you the formula. Does anyone out there have older books that might
have frit formulas
that we can compile into a more comprehensive list?
--
-------
T o n y H a n s e n thansen@digitalfire.com
Get INSIGHT, Magic of Fire at http://digitalfire.com
David Hendley on sun 15 feb 98
My best reference for frit formulations is an article in May 1978
Ceramics Monthly, by editor William Hunt, titled, appropriatly,
'Frit Formulas'.
Six pages of formulations including coefficient of expansion
and molecular weight. A chart of cross-referenced numbers
for equivalents between manufacturers. Eight pages total.
Being from 1978, a lot of the listed frits are lead frits.
David Hendley
Maydelle, Texas
At 09:17 AM 2/13/98 EST, you wrote:
>In recent years some frit companies, such as Fusion Ceramics, freely
>supplied the chemical analysis of their frits. Others, such as Ferro
>who were forthcoming with data in the past, have been more guarded and
>either provide no chemistry or approximate analyses. There is now a
>situation of 'legal chill' in the industry because of law suits against
>the frit manufacturers for deviance of their products from the published
>formulas. Now most companies are hesitant to supply formula data. Since
>most standard frits have been made for many years users are doing
>'intelligence work' to get the formulas by finding them in older
>magazines
>and books and by deducing them from charts of equivalent frits from
>different manufacturers.
>
>I have many hundreds of formulas. All you need is an equivalence chart
>and I can give
>you the formula. Does anyone out there have older books that might
>have frit formulas
>that we can compile into a more comprehensive list?
>
>--
>-------
>T o n y H a n s e n thansen@digitalfire.com
>Get INSIGHT, Magic of Fire at http://digitalfire.com
>
>
George Mackie on sun 15 feb 98
Tony -you asked:
Does anyone out there have older books that might
have frit formulas
that we can compile into a more comprehensive list?
I have the formulae for all the Ferro frits sent to me by the company in
1978 in case youre interested. George
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