Mixture of 1-propanol, (propyl alcohol) becomes viscous at about -90. You
can use this down to -115 deg C. Relatively non toxic compared with some
other solvents. Since it doesn't form a slush, the exact temp should be
measured.

As with other solvents, cool down with liquid nitrogen.


>
>I wonder if someone can provide me with information on slushes,
>mixtures etc. to cool down a cold trap to -100 C, give or take 10?
>
>Thank you very much indeed.
>
>
>Regards,
>
>                   Wolfram
>
>*****************************************************
>Dr. W. Meier-Augenstein
>Hon. Lecturer in Chemistry
>
>University of Dundee, Dept. of Anatomy & Physiology,
>Small's Wynd, DUNDEE  DD1 4HN, United Kingdom
>
>Tel.: +44-(0)1382-34/5124, /4968
>      +44-(0)468 -314563
>Fax:  +44-(0)1382-34/5514
>
>e-mail: [log in to unmask]
>
>URL: http://www.dundee.ac.uk/AnatPhys/wolfram.htm
>*****************************************************

-----------------------------------------------------
Bob Fifer
Benedum Stable Isotope Laboratory
Brown University                Geological Sciences
Box 1846
Providence, RI 02912

Phone:  401-863-1698            E-mail: [log in to unmask]
Fax:    401-863-2058