A friend of mine uses PTFE...haven't tried it but it sounds good...for fills.
(wasn't the original poster asking about N2 vent tubing...?)
....Yea we stopped using the rubber connections because it eventually fractures
and can shoot pieces out when it does. We have been using bellowed PTFE for a
few years now. The lower end of the temperature range is -450F. It is a little
costly but worth it. They last a few years but will finally start leaking on
the magnet side from strain. I buy a 6 or 10 foot section and then add a 1
foot section to the end so that it can be replaced if it fails preserving the
lengthy piece. The ID of the of the tube in the link (.4794) snuggly fits
most of our magnets nitrogen turrets so no need for the rubber connector.
https://www.mcmaster.com/51155K68/
________________________________
> From: main_at_ammrl.groups.io on behalf of Cathy Clewett via groups.io
> Sent: Monday, January 5, 2026 9:21 AM
> To: main_at_ammrl.groups.io
> Subject: Re: [AMMRL] Real Natural Rubber Tubing
Hi all,
The pipe insulation may work well for the purpose described, and be aware that
some of this material is magnetic. Way back another lifetime ago, we used to
use it to insulate heating air going to our probes. We found that the material
was magnetic and affected our shims. It also has a tendency to pill and shred
with repeated use. I would suggest being careful with it around magnets.
Cheers!
Catherine F. M. Clewett, Ph.D.
Asst. Director Magnetic Resonance
Chemistry Instrumentation Center
University of Wisconsin Madison, Department of Chemistry
1101 University Ave Room 2201c, Madison, WI 53706
clewett_at_wisc.edu, (608)262-8196,
https://pbcic.chem.wisc.edu
-=-=-=-=-=-=-=-=-=-=-=-
Groups.io Links: You receive all messages sent to this group.
View/Reply Online (#3089): https://urldefense.com/v3/__https://ammrl.groups=
.io/g/main/message/3089__;!!PvDODwlR4mBZyAb0!Uwf2_cm3u7kCou2AplAAxtK42JuB0N=
g05KFETjX2GYQgaWBLhLEjzjffUixEGXjPNs34hFTambAvcTKvL5PDt4ANTQ$
Mute This Topic: https://urldefense.com/v3/__https://groups.io/mt/116902195=
/7559972__;!!PvDODwlR4mBZyAb0!Uwf2_cm3u7kCou2AplAAxtK42JuB0Ng05KFETjX2GYQga=
WBLhLEjzjffUixEGXjPNs34hFTambAvcTKvL5PrVTRFAw$
Group Owner: main+owner_at_ammrl.groups.io
-=-=-=-=-=-=-=-=-=-=-=-
Received on Mon Jan 05 2026 - 07:23:33 MST