From: TILAK CHANDRA <0000058f112ac338-dmarc-request**At_Symbol_Here**LISTS.PRINCETON.EDU>
Subject: Re: [DCHAS-L] Schlenk Line Survival Guide
Date: Thu, 23 Apr 2020 19:44:04 +0000
Reply-To: ACS Division of Chemical Health and Safety <DCHAS-L**At_Symbol_Here**PRINCETON.EDU>
Message-ID: CH2PR06MB661441C549CA8F80305670EE88D30**At_Symbol_Here**CH2PR06MB6614.namprd06.prod.outlook.com
In-Reply-To <0f67acc4-efbd-1780-42be-98274e6dd069**At_Symbol_Here**well.com>



Practically, we need to use flexible tubing for the Schlenk line manipulations; so, we can insert the tubing to the Schlenk line ports and Schlenk flask adapter without exerting any pressure. Also, we should be able to rotate the flasks around, a thick and hard tubing will limit the movement and may exert a lot of strain on Schlenk line ports.


For maximum chemical manipulations flexible rubber tubing works very well. We need to be only careful when manipulating highly-air sensitive compounds such as iron-sulfur cluster, otherwise rubber tubing should be fine..

 Tilak



From: ACS Division of Chemical Health and Safety <DCHAS-L**At_Symbol_Here**PRINCETON.EDU> on behalf of davivid <davivid**At_Symbol_Here**WELL.COM>
Sent: Wednesday, April 22, 2020 2:32 PM
To: DCHAS-L**At_Symbol_Here**PRINCETON.EDU <DCHAS-L**At_Symbol_Here**PRINCETON.EDU>
Subject: Re: [DCHAS-L] Schlenk Line Survival Guide
 
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
Principal
Clavis Technology Development

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