From: RAMPUR VISWANATH <000005c25051b089-dmarc-request**At_Symbol_Here**LISTS.PRINCETON.EDU>
Subject: Re: [DCHAS-L] Schlenk Line Survival Guide
Date: Thu, 23 Apr 2020 04:25:27 +0000
Reply-To: RAMPUR VISWANATH <r.viswanath**At_Symbol_Here**YAHOO.COM>
Message-ID: 1136261544.100115.1587615927657**At_Symbol_Here**
In-Reply-To <0f67acc4-efbd-1780-42be-98274e6dd069**At_Symbol_Here**>

Hi David:
Use thick wall Teflon tubing in place of Tygon to solve that problem

Rampur Viswanath, Ph.D., REM, CHMM
US Fulbright Senior Scholar (2015-2016)
Vice-Chairman, Hazardous Materials Society, Rockville, Maryland, USA
Founder & President, ACHMM-India Chapter, Bangalore, India
Career Consultant, American Chemical Society, Washington, District of Columbia, United States 
Past Chairman, American Chemical Society's Southern Nevada Chapter, Las Vegas, United States
General Chairman, American Chemical Society's 2022-Western Regional Conference, Las Vegas, United States
International Ambassador-Alliance of Hazardous Materials Professionals, Rockville, Maryland, United States
Rotary District Governor (2011-2012)-D5080 (parts of Washington, Idaho and British Columbia)
Member-Rotary Club of Las Vegas (D5300), Las Vegas, Nevada, United States

On Wednesday, April 22, 2020, 01:57:38 PM PDT, davivid <davivid**At_Symbol_Here**> wrote:

One thing to remember when using Schlenk lines or other vacuum apparatus
is that commonly used Tygon (or other vinyl) tubing is somewhat air
permeable. I have seen a rise of several tens of mtorr in the ultimate
vacuum of a system when a ~1 foot section of 1/4" ID x 1/2" OD Tygon
line was added via well clamped hose barbs. Tubing specified for vacuum
use has much thicker walls but is much stiffer and more difficult to
manipulate and places more force on the glassware when bent.

Best regards
Dave Lane
Clavis Technology Development

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