Dominik,
 
Boron nitride has been used as a diluent. 
 
You might check Polymer Source (www.polymersource.com) for the polyethylene you're looking for, however they seem to be quite expensive.  ChemPlex (www.chemplex.com) also has binders and specializes in products for XRF analysis.
 
HTH,
-Richard

On Wed, Aug 19, 2009 at 2:27 PM, Dominik Samuelis <d.samuelis@fkf.mpg.de> wrote:
Dear list,

for many years, I have used  "Merck Uvasol Polyethylene for
spectroscopy" PE powder as a diluent and binder for pressing
self-supporting pellets especially of air-sensitive substances. When I
today wanted to order a new bottle, I had to learn that it's not
available anymore (actually, since 2002... :-)).

Does anyone of you know about any other supplier of spectroscopy-grade
polyethylene powder? And more general, which binder/diluent do you use
for preparing pellets of sensitive substances ?

Best regards,
Dominik


--
Dr. Dominik Samuelis
d.samuelis@fkf.mpg.de
Max-Planck-Institut für Festkörperforschung
Max Planck Institute for Solid State Research
Heisenbergstr. 1
70569 Stuttgart
Germany
Phone +49-711-689-1769
Fax   +49-711-689-1722
Web   http://www.fkf.mpg.de/maier/

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