Dear Dr. Subramaniam,
I believe you have a Bruker variable-temperature accessory with a standard NW 50 (sometimes called KF 50) O-ring assembly joining the heater assembly with the neck of the dewar. These O-ring assemblies are commonly used on both high-vacuum and cryogenic apparatus. You can order replacement Viton fluoroelastomer O-rings (for low temperature operation) from Edwards High Vacuum:
https://shop.edwardsvacuum.com/fittings/nw/508/528/h02124038/view.aspx
Alternatively, you can order replacement NW 50 O-ring assemblies from McMaster-Carr supply company (cat. No. 4518K65):
http://www.mcmaster.com/#4518k65/=1021mzi
They don't seem to sell the O-ring by itself, but they deliver very quickly!
Best regards,
Ken Fishbein
Kenneth W. Fishbein, Ph.D.
Facility Manager, MRI Section
National Institute on Aging
National Institutes of Health
251 Bayview Boulevard
Suite 100, Room 04B120
Baltimore, MD 21224
(410) 558-8512
FAX: (410) 558-8376
kf31x_at_nih.gov<mailto:kf31x_at_nih.gov>
From: Gopal Subramaniam [mailto:Gopal.Subramaniam_at_qc.cuny.edu]
Sent: Tuesday, December 01, 2015 11:19 AM
To: ammrl_at_ammrl.org
Subject: AMMRL: O-ring for liquid nitrogen cooling accessory
I hope some of you have liquid nitrogen cooling accessory for low temp experiments using a 30 L dewar. The black 2" O-ring sitting on the top aluminum ring is broken. Let me know if any of you have bought reliable replacements and if so, please let me know source and catalog #. Thank you.
Dr. Gopal Subramaniam (718-997-4123)
Department of Chemistry & Biochemistry
Queens College - CUNY
Flushing, NY 11367
Received on Tue Dec 01 2015 - 16:15:44 MST