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Dear Pier

Supremax is an alumosilicate glass with a quite high transformation
temperature (around 700°C).
Composition roughly: 50%SiO2, 20%Al2O3, 7%CaO, 7%MgO, 10% P oxides. It is
produced by Glaswerke Wertheim in (former western part of) Germany and used
in the mass spectrometric low-level measurement of Tritium, for the storage
of the degassed water during 3Helium ingrow: its diffusion coefficient for
Helium is around 5 orders of magnitude lower than for Duran.

The other two kinds of glasses I do not know.

Axel

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Dr. Axel Suckow
Institut für Geowissenschaftliche
Gemeinschaftsaufgaben (GGA);
Institute for Joint Geoscientific Research (GGA);
Geochronology and Isotope Hydrology (S3);
Stilleweg 2;
30655 Hannover;
Phone: +49 511 6432527;
Fax:   +49 511 6433665;
e-mail: [log in to unmask] <mailto:[log in to unmask]>



-----Ursprüngliche Nachricht-----
Von: Pier de Groot [mailto:[log in to unmask]]
Gesendet am: Mittwoch, 13. Dezember 2000 13:50
An: [log in to unmask]
Betreff: <no subject>

Dear all,

This time a question from me.
In literature a number of different glass types are reported. It concerns
some names probably originating from the former eastern European producers?
Names such as: Rasotherm, Uviol-glass, or Supremax (last one used by Fiedler
and Proksch, 1972) were used. Can anyone explain to me what types of glass
these are? Borosilicates, silicate glass, .... and what is a comparable
quality in common glass types.

I hope to get a fast answer - I will move soon from this address and I will
not be able to look into e-mail as regular as I am used to for the comming
month.

Best wishes,
Pier.

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