DCHAS-L Discussion List Archive
Date: Mon, 25 Oct 2010 06:34:11 -0700
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: DAVID KATZ <dakatz45**At_Symbol_Here**MSN.COM>
Subject: Re: attaching tubing to glass
In-Reply-To: <C8EA989F.1A9CE%snuz**At_Symbol_Here**mac.com>
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
____________________________________________________________________
_____
David A.
Katz
Chemist, Educator, Expert Demonstrator, Science Communicator,
and
Consultant
Programs and workshops for teachers,
schools,
museums, and the public
133 N. Desert Stream Dr. * Tucson, AZ
85745-2277 * USA
voice/fax: (520) 624-2207 * email:
dakatz45**At_Symbol_Here**msn.com
Visit my web site:
http://www.chymist.com___________
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----- Original Message -----
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.
Chris
From: "House, Katherine C." <HouseKC**At_Symbol_Here**CORMETECH.COM>
Reply-
To:
DCHAS-L Discussion List <DCHAS-L**At_Symbol_Here**list.uvm.edu>
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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