Dear AMMRLers,
Thanks to the 20 or so who responded to my request concerning the use of PVC
(Tygon) to transfer LN2. The bottom line was NOT to use it!! 7 responses
recommended AGAINST using PVC, while only 2 have mentioned using PVC, and
one of these two only uses a short length of it to couple to another
transfer line.
What people DO use seemed to by divided up fairly evenly:
Amber latex: 5
Black/Red Rubber: 3
Stainless Steel/Copper: 3
Other* 5
* one vote each for: teflon, silicon, polytetrafluoroethylene (teflon too?),
and 2 groups use polyethylene/propylene tubing. (several responders voted
against the use of PVC without mentioning what they use themselves)
Also, it was pointed out that "more can be less" in liquid transfer in that
thick wall/overly insulated transfer lines take too long to cool, leading
to "the more LN2 you piss away" LOL!
So thanks again, I have returned the thick wall PVC to the stockroom to
collect dust for another 10 years!
Cheers!
Neal
____________________________________________________________________________
Neal J Stolowich, Ph.D. Sr. Spectroscopist and Manager,
Dept of Chemistry U of L NMR Facility
2320 S. Brook St.
University of Louisville Phone: (502) 852-7894
Louisville, KY 40292 Fax: (502) 852-8149
____________________________________________________________________________
Received on Wed Oct 31 2001 - 10:58:28 MST