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.

Barry

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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