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
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
_________________________________________________________________________
----- 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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