Edouard Bastarache on wed 19 sep 01
Hello Ron,
Here is Smart's answer:
"I also had the same reaction by seeing the photographs of the crystals.
I was also very skeptical about the recommendations concerning the crushi=
ng
of these dyes...
The results of the tests on my products are very different.
Under the conditions of crushing and mixture of the materials composing
my glazes (mainly frits) with inclusion pigments, I have not observed any
aggravation in the release of cadmium after testing (FDA Cd leaching test=
s
among others).
The results are largely below the allowed limits by the most severe
standards relating to products in contact with food. But my conditions of
baking (> 1060=B0C) and the composition of my glazes (very high silica
content) can
influence these results considerably.
Smart"
Later,
Edouard Bastarache
Irreductible Quebecois
Sorel-Tracy
Quebec
edouardb@sorel-tracy.qc.ca
http://sorel-tracy.qc.ca/~edouardb/
http://www.absolutearts.com/portfolios/e/edouardb/
Ron Roy on thu 20 sep 01
I notice a discrepancy - in your first post he says 1350C - in this one he
says 1060C - that is quite a difference - difficult to get good chemical
resistance and high silica at 1060C
I am glad he mentions the importance of high silica and it's influence on
stability. I can add - due to John Hesselberths experiments - that good
melting is also an important factor - and so are alumina levels.
RR
>Here is Smart's answer:
>
>
>"I also had the same reaction by seeing the photographs of the crystals.
>I was also very skeptical about the recommendations concerning the crushing
>of these dyes...
>The results of the tests on my products are very different.
>Under the conditions of crushing and mixture of the materials composing
>my glazes (mainly frits) with inclusion pigments, I have not observed any
>aggravation in the release of cadmium after testing (FDA Cd leaching tests
>among others).
>The results are largely below the allowed limits by the most severe
>standards relating to products in contact with food. But my conditions of
>baking (> 1060=B0C) and the composition of my glazes (very high silica
>content) can
>influence these results considerably.
>
>Smart"
>
>
>Later,
>
>
>
>Edouard Bastarache
>Irreductible Quebecois
>Sorel-Tracy
>Quebec
>edouardb@sorel-tracy.qc.ca
>http://sorel-tracy.qc.ca/~edouardb/
>http://www.absolutearts.com/portfolios/e/edouardb/
>
>___________________________________________________________________________=
___
>Send postings to clayart@lsv.ceramics.org
>
>You may look at the archives for the list or change your subscription
>settings from http://www.ceramics.org/clayart/
>
>Moderator of the list is Mel Jacobson who may be reached at melpots@pclink.=
com.
Ron Roy
RR# 4
15084 Little Lake Rd..
Brighton,
Ontario, Canada
KOK 1H0
Residence 613-475-9544
Studio 613-475-3715
=46ax 613-475-3513
Edouard Bastarache on thu 20 sep 01
Hello Ron,
the first post was a translation of a part of one
of the pages on cadmium on his web site.
Soon, I will translate the whole page, when I have
some free time, and probably post it on Clayart.
I like the usefullness of his vast experience in using
all sorts of materials in large amounts in a large
pottery factory.
You may visit the Gien factory's web site at:
http://www.gien.com/ushtm/gienf.htm
Later,
Edouard Bastarache
Irreductible Quebecois
Sorel-Tracy
Quebec
edouardb@sorel-tracy.qc.ca
http://sorel-tracy.qc.ca/~edouardb/
http://www.absolutearts.com/portfolios/e/edouardb/
----- Original Message -----
From: Ron Roy
To:
Sent: Thursday, September 20, 2001 12:55 AM
Subject: Re: Smart.Conseil's answer(Cadmium)
I notice a discrepancy - in your first post he says 1350C - in this one h=
e
says 1060C - that is quite a difference - difficult to get good chemical
resistance and high silica at 1060C
I am glad he mentions the importance of high silica and it's influence on
stability. I can add - due to John Hesselberths experiments - that good
melting is also an important factor - and so are alumina levels.
RR
>Here is Smart's answer:
>
>
>"I also had the same reaction by seeing the photographs of the crystals.
>I was also very skeptical about the recommendations concerning the crush=
ing
>of these dyes...
>The results of the tests on my products are very different.
>Under the conditions of crushing and mixture of the materials composing
>my glazes (mainly frits) with inclusion pigments, I have not observed an=
y
>aggravation in the release of cadmium after testing (FDA Cd leaching tes=
ts
>among others).
>The results are largely below the allowed limits by the most severe
>standards relating to products in contact with food. But my conditions o=
f
>baking (> 1060=B0C) and the composition of my glazes (very high silica
>content) can
>influence these results considerably.
>
>Smart"
>
>
>Later,
>
>
>
>Edouard Bastarache
>Irreductible Quebecois
>Sorel-Tracy
>Quebec
>edouardb@sorel-tracy.qc.ca
>http://sorel-tracy.qc.ca/~edouardb/
>http://www.absolutearts.com/portfolios/e/edouardb/
>
>________________________________________________________________________=
___
___
>Send postings to clayart@lsv.ceramics.org
>
>You may look at the archives for the list or change your subscription
>settings from http://www.ceramics.org/clayart/
>
>Moderator of the list is Mel Jacobson who may be reached at
melpots@pclink.com.
Ron Roy
RR# 4
15084 Little Lake Rd..
Brighton,
Ontario, Canada
KOK 1H0
Residence 613-475-9544
Studio 613-475-3715
Fax 613-475-3513
_________________________________________________________________________=
___
__
Send postings to clayart@lsv.ceramics.org
You may look at the archives for the list or change your subscription
settings from http://www.ceramics.org/clayart/
Moderator of the list is Mel Jacobson who may be reached at
melpots@pclink.com.
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