Date: Mon, 25 Oct 2010 09:20:12 -0400
Reply-To: DCHAS-L Discussion List <DCHAS-L**At_Symbol_Here**LIST.UVM.EDU>
Sender: DCHAS-L Discussion List <DCHAS-L**At_Symbol_Here**LIST.UVM.EDU>
From: Ben Ruekberg <bruekberg**At_Symbol_Here**CHM.URI.EDU>
Subject: Re: attaching tubing to glass
In-Reply-To: <BLU104-DS244CE82B634C4CE9915ABC5410**At_Symbol_Here**phx.gbl>

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As long as the subject of clamping has come up, I would (immodestly) point out an “improvement” in clamping technique published in Journal of Chemical Education (1992) vol. 69 #2, p. 168.  It involves folding a length of fiber glass-reinforced tape almost in half (so that one sticky end extends out), sticking that end to the end of the tubing (after the insertion is accomplished), wrapping the rest of the tape around the tubing and tightening the clamp over the tape (rotating as necessary to keep the tape from wrinkling).  This procedure helps prevent the tubing from being extruded through the holes in the hose clamp.


From: DCHAS-L Discussion List [mailto:DCHAS-L**At_Symbol_Here**LIST.UVM.EDU] On Behalf Of DAVID KATZ
Sent: Monday, October 25, 2010 9:34 AM
To: DCHAS-L**At_Symbol_Here**LIST.UVM.EDU
Subject: Re: [DCHAS-L] attaching tubing to glass

Depending on the size of the glass tube and the i.d. of the Tygon tubing, the tubing may slide off of the glass during use if vacuum grease has been applied.  It is usually a good idea to use a hose clamp to secure the tubing in these cases.


No matter how the Tygon tubing was attached to the glass tube, whether it has been by warming it to soften it or using water to allow it to slide onto the tube, there is the problem of removing the Tygon tubing from the glass tube at the end of the procedure.  That's where most accidents, that I have observed, have happened.  I normally recommend cutting off the Tygon tubing near the Tygon-to-glass connection leaving a small length of tubing attached to the glass.  Then remove the piece of Tygon from the glass by placing it on a solid surface, protecting hands with gloves, and carefully cutting the Tygon tube in a diagonal cut so it can be safely removed.


In our academic lab, I have not been successful in convincing some instructors to use the "old fashioned" rubber tubing when connecting water jacketed condensers to water supplies.  We tend to lose condensers when students try to remove the Tygon tubing from the water inlets.  Luckily, the number of personal injuries have been very small.



___________________________________ ______________________________________
  David A. Katz             
  Chemist, Educator, Expert Demonstrator, Science Communicator, and Consultant  
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----- Original Message -----

From: Christopher Suznovich

To: DCHAS-L**At_Symbol_Here**LIST.UVM.EDU

Sent: Sunday, October 24, 2010 11:14 PM

Subject: Re: [DCHAS-L] attaching tubing to glass

Depending on your application rubbing the glass with a water to slightly moisten it will help the tubing slide on.  Typically I've always found a thin layer of vacuum grease on the glass tubing then gently twist the tubing on works best.  The vacuum grease is inert in almost all cases and provides and airtight seal as well.


From: "House, Katherine C." <HouseKC**At_Symbol_Here**CORMETECH.COM>
Reply-To: DCHAS-L Discussion List <DCHAS-L**At_Symbol_Here**>
Date: Fri, 22 Oct 2010 15:20:08 -0400
To: <DCHAS-L**At_Symbol_Here**LIST.UVM.EDU>
Subject: [DCHAS-L] attaching tubing to glass

A step in one of the analyses we do in our lab involves connecting Tygon tubing to the end of a glass tube.  We have Kevlar gloves for this purpose, but I've heard of an additional safety device that can also be used for this purpose-though I can't find one.  I've done the obligatory Google search with no luck.  Has anyone heard of or used anything that reduces the risk of getting cut while attaching hose/tubing to glass tubes or rods?
Many thanks; I hope everyone has a great weekend!
Katherine C. House, CCHO
Laboratory Coordinator
Chemical Hygiene Officer
Cormetech, Inc.
5000 International Drive
Durham, NC 27712
919.620.3044 (office)
919.815.2024 (mobile)

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