We have found you can use 9mmm OD tubing just fine in the 3/8" Cajon Ultra-torr fittings. If the glass is a little too small you just use a thicker Viton O-ring which is available from auto supply companies.
A. Richard Heemskerk, Lab Manager
Environmental Isotope Laboratory [log in to unmask]
Dept. of Earth and Environmental Sciences 519-888-4567 Extension: 35838
University of Waterloo 519-746-7484
Waterloo, Ontario, Canada N2L 3G1 http://www.uweilab.ca
Please consider the environment before printing this email.
From: Stable Isotope Geochemistry [mailto:[log in to unmask]] On Behalf Of Lisa Wingate
Sent: October 7, 2014 10:59 AM
To: [log in to unmask]
Subject: [ISOGEOCHEM] Sourcing Vacuum Glassware in Europe for Swagelok Ultra Torr 3/8" Connectors
Dear List members,
I was wondering whether someone in Europe or beyond (USA) could help me source some glass tubing for working under vacuum (~0.3Pa). I am now committed to using Swagelok 3/8" Ultra Torr fittings and I would like to find a glass blower or glass supplier with a compatible tube O.D. Most of the glassblowers I have spoken to in France only have metric tubing 9mm or 10mm with a tolerance of +/- 0.15mm.
So can anybody suggest a supplier/glassblower that they have worked successfully with to obtain glass tubing that fits well with the Swagelok Ultra Torr 3/8" fittings.
One option at the moment may be to have the 10mm glass ground down to ~9.5mm. The glass is no longer polished in appearance or feel and I wondered whether I should worry about this for the vacuum seal.
Alternatively, the other option may be to ask Swagelok to drill out the Ultra Torr to fit 10mm tubing but this may be more expensive and take longer?
Any advice welcome on the list or alternately you can contact me offline by email.
Thanks in advance,
Dr Lisa Wingate
Interactions Soil Plant Atmosphere [UMR ISPA 1391] Institut National de la Recherche Agronomique [INRA].
71 Avenue Edouard Bourlaux
33882 Villenave d'Ornon Cedex
[log in to unmask]
Telephone ++33 (0)557 122431
Fax ++33 (0)557 122420