Hello,
we are using reinforced PVC tube (softenned PVC, both the inner and outer
parts) for drinking water (a kind of a „garden hose“ as well
like this
https://www.gumex.cz/h/1125-hadice-na-pitnou-vodu-a-tekute-pozivatiny-01283?Filter=True
either 10/14mm diam. or 16/22 diam. (inner/outer) for different magnets.
It is rigid and brittle when cold. It has to warm up (either naturally or with
a heat gun) to become flexible again.
It breaks once upon a time (in several monts/a year), so we cut a new piece.
At a price of ~ 1USD/m it is much cheaper than the Bruker set. It does not
disintegrate in an „explosive“ manner into many small pieces.
The Bruker PTFE coversion piece and a chunk of silicon is useful when using
the thinner hose for two magnets with different inlet diameters. The silicon
chunk can be bought separately too.
Best regards,
Jan
> From: main_at_ammrl.groups.io On Behalf Of Michael Groves via groups.io
> Sent: Monday, January 5, 2026 4:44 PM
> To: main_at_ammrl.groups.io
> Subject: Re: [AMMRL] Real Natural Rubber Tubing
I'll second the PTFE. It stays nice and flexible with LN2 flowing through =
it. Bruker sells a kit
https://store.bruker.com/products/nitrogen-refill-set
with a chunk of silicone tubing on each end and the PTFE in the middle. And
an adapter for the larger fill ports on the newer Bruker magnets. People
definitely have to replace the silicone tubing occasionally but that PTFE
stuff will last a long time.
Cheers,
Mike
On Monday, January 5, 2026 at 08:23:33 AM MST, Plant,Daniel via groups.io wrote:
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 (.47”)
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
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Received on Mon Jan 05 2026 - 08:42:25 MST