Paul Lewing on tue 8 mar 11
Marci Blattenberger and I and the members of PPIO (Porcelain Painters
International Online) have been talking recently about a product that
china painters call "glaze" that is essentially clear china paint,
used sometimes as an overcoat over china paint that isn't quite glossy
enough. She has found a container of this stuff which listed the
constituent oxides (in alphabetical order so not much help in figuring
out the real composition) but then she sent this information along to
me as well. Does anybody have any idea what this means? I've never
heard of a CAS number. And does that frit number mean anything to
anybody? Brand? Composition?
In the china painting world, it's almost impossible to find out what's
in any of the materials because the formulas are all proprietary, so
when you get a clue like this you have to pursue it.
Thanks.
Begin forwarded message:
From: marci and rex
Date: March 8, 2011 3:59:57 PM PST
To: Paul Lewing
Subject: Re: flux and pink glaze
It also has a CAS # ( NO idea what that is but its after each
ingredient) ...
eg:
after the AlO the Cas # is 1344-28-1
the frit says 65997-18-4
Paul Lewing
www.paullewingtile.com
www.paullewingart.com
Johanna DeMaine on wed 9 mar 11
Hello Paul
A quick google led me to Wikepedia which explains=3D20
"CAS Registry Numbers[1] are unique numerical identifiers assigned by the=
=3D
=3D20
"Chemical Abstracts Service" to every chemical described in the open scie=
=3D
ntific=3D20
literature (currently including those described from at least 1957 throug=
=3D
h the=3D20
present) and including elements, isotopes, organic and inorganic compound=
=3D
s,=3D20
organometallics, metals, alloys, coordination compounds, minerals, and sa=
=3D
lts; as=3D20
well as standard mixtures, compounds, polymers; biological sequences incl=
=3D
uding=3D20
proteins & nucleic acids; nuclear particles, and nonstructurable mate=3D
rials (aka=3D20
'UVCB's- i.e., materials of Unknown, Variable Composition, or Biological =
=3D
origin).
[2] They are also referred to as CAS RNs, CAS Numbers, etc."
Here is a link to the MSDS=3D20
http://www.jtbaker.com/msds/englishhtml/a2844.htm=3D20
65997-18-4 is the CAS # for lead bisilicate commonly referred to as fr=
=3D
it 3269.=3D20
A link to the MSDS is=3D20
http://www.chemcas.com/msds_archive/part2/cas/gm_msds/standardceramic_
com---frit-3269.asp
Regards
Johanna
Johanna DeMaine
http://johanna.demaine.org
http://overglaze.info
http://allthatissublime.com
--- In clayart@yahoogroups.com, Paul Lewing wrote:
>
> Marci Blattenberger and I and the members of PPIO (Porcelain Painters
> International Online) have been talking recently about a product that
> china painters call "glaze" that is essentially clear china paint,
> used sometimes as an overcoat over china paint that isn't quite glossy
> enough. She has found a container of this stuff which listed the
> constituent oxides (in alphabetical order so not much help in figuring
> out the real composition) but then she sent this information along to
> me as well. Does anybody have any idea what this means? I've never
> heard of a CAS number. And does that frit number mean anything to
> anybody? Brand? Composition?
> In the china painting world, it's almost impossible to find out what's
> in any of the materials because the formulas are all proprietary, so
> when you get a clue like this you have to pursue it.
> Thanks.
>=3D20
> Begin forwarded message:
>=3D20
> From: marci and rex
> Date: March 8, 2011 3:59:57 PM PST
> To: Paul Lewing
> Subject: Re: flux and pink glaze
>=3D20
>=3D20
> It also has a CAS # ( NO idea what that is but its after each
> ingredient) ...
> eg:
> after the AlO the Cas # is 1344-28-1
>=3D20
> the frit says 65997-18-4
>=3D20
>=3D20
> Paul Lewing
> www.paullewingtile.com
> www.paullewingart.com
>
Johanna DeMaine on sun 13 mar 11
Hello Paul
I must apologize to you and the list for making some hasty assumptions in=
=3D
my=3D20
previous post regarding CAS# 65997-18-4
1. Lead bisilicate has indeed got this CAS# but on further research I ha=
=3D
ve=3D20
discovered that all glass frits in general share this number. Therefore =
=3D
the flux=3D20
is not necessarily lead bisilicate which came up first for CAS# 65997-18-=
=3D
4 in=3D20
Google.
2. Frit 3269 is actually a sodium borosilicate frit which also shares th=
=3D
is number.=3D20=3D20
I made the hasty conclusion that the frit referred to was lead bisilicate=
=3D
and=3D20
therefore 3269 without doing my research properly. However Frit 3269 is=3D=
20=3D
described in Ferro's MSDS for 3269 as
PRODUCT CODE:3269
PRODUCT TRADE NAME:3269 FLUX
CAS NO:65997-18-4*
CHEMICAL FAMILY:Decorative Borosilicate Coating
PRODUCT TYPE:Glass Enamel/Flux
I made the mistake of focussing on the words glass/enamel flux and glossi=
=3D
ng=3D20
over the rest and not even registering the word borosilicate.
Once again my apologies for the misinformation.
Cheers=3D20
Johanna
Johanna DeMaine
http://johanna.demaine.org
http://overglaze.info
http://allthatissublime.com
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