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Date: Wed, 27 May 2009 15:58:36 -0700
Reply-To: "Larry D. McLouth" <LDMclouth**At_Symbol_Here**LBL.GOV>
Sender: DCHAS-L Discussion List <DCHAS-L**At_Symbol_Here**LIST.UVM.EDU>
From: "Larry D. McLouth" <LDMclouth**At_Symbol_Here**LBL.GOV>
Subject: Vented Caps

Has anyone ever used vented caps such as those produced by Performance 
Systematix Inc?   These have liners made of expanded PTFE that are 
liquid tight but allow gases and vapors to permeate, thus reducing 
pressure build up. They are normally used to replace standard chemical 
container caps for chemicals that offgas.

If you've used them what is your opinion of them?

Do you know of other sources of vented caps (i.e., other than 
Performance Systematix Inc)?

Regards

Larry

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