Need a recommendation on a good vacuum pump for removal of high boiling solvents

Hey Everyone
This is my first post here but I've been a lurker for a bit. Anyways
the lab I'm working in has got a few old Welch Duoseals(couple 1399's
and a 1400) but unfortunately they've seen so much general use that
they don't pull as good a vacuum as they should. Now we're looking at
getting a new high vac specifically for removal of small amounts
(probably under 20mL's) of high boiling solvents, specifically DMSO and
DMF.

I've looked around and done some reading and right now I think the
choice is between getting another Welch Duoseal, an Alcatel, or an
Edwards. We really want to get something that will pull and maintain a
nice low vacuum to a couple millitorr, and will be rugged and
dependable with good normal maintenance. I'd really appreciate it if
people could toss me some suggestions or any good or bad experiences
with any pumps they've used. Thanks a lot!

Eli Zukowski
Dr. James Fishbein's Lab
Chemistry Department
University of Maryland, Baltimore County

.

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