Date: Thu, 28 May 2009 21:26:14 -0400
Reply-To: BR <barryrayfield**At_Symbol_Here**NC.RR.COM>
Sender: DCHAS-L Discussion List <DCHAS-L**At_Symbol_Here**LIST.UVM.EDU>
From: BR <barryrayfield**At_Symbol_Here**NC.RR.COM>
Subject: Re: Vented Caps
Comments: To: "Larry D. McLouth"
In-Reply-To: <4A1DC59C.8000001**At_Symbol_Here**>

Integris also makes similar venting drum bungs and tote caps.  For 
example, they are a must when shipping >10% hydrogen peroxide.  DOT 
requires these be installed for any material that can build up enough 
pressure within a container, under normal handling conditions, to cause 
the container to over-pressure and fail.


Larry D. McLouth wrote:
> 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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