Al Sather on tue 20 jan 04
Oops
I may have been to quick on the send button. After reading Edouard's post, I
realize their are difference between the natural and calcined diatomaceous
earth. The first URL I posted describes the latter. Another MSDS describing
a natural diatomaceous earth for example
http://www.apacapacas.com/msds.html
is more consistent with Edouard's statement. However, I also found a vast
array of MSDS descriptions for "natural diatomaceous earth."
As potters, I think we should all be aware of the consequences of inhaling
any dusty compound.
Al Sather
Dogberry Clay Studio
-----Original Message-----
From: Clayart [mailto:CLAYART@LSV.CERAMICS.ORG] On Behalf Of Edouard
Bastarache Inc.
Sent: Tuesday, January 20, 2004 4:13 PM
To: CLAYART@LSV.CERAMICS.ORG
Subject: [CLAYART] Silica, amorphous-Diatomaceous earth
Amorphous silica, natural diatomaceous earth, is usually considered to be of
low toxicity; however, pure amorphous silica is rarely found.
Processing of amorphous silica by high-temperature calcining alters the
silica from the benign amorphous to the pathogenic form (cristobalite),
which causes lung fibrosis.
<>
"Ils sont fous ces quebecois"
Edouard Bastarache
Irreductible Quebecois
Indomitable Quebeker
Sorel-Tracy
Quebec
edouardb@sorel-tracy.qc.ca
http://sorel-tracy.qc.ca/~edouardb/
http://perso.wanadoo.fr/smart2000/index.htm
http://www.digitalfire.com/education/toxicity/
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