[time-nuts] Water Proof Vent

[Robert Darlington]

Take a look at porous PTFE products like POREX.  High gas
permeability, low liquid permeability.

-Bob

On Tue, May 15, 2012 at 11:43 AM, Lee Mushel <herbert3 at centurytel.net> wrote:
> Well, remember that Tyvek is not a vapor barrier---that's what makes it so
> useful but if you're going to  use it I suggest you review partial pressures
> and decide if the vapor movement is in the direction you want it!
>
> Lee
> ----- Original Message ----- From: "Brooke Clarke" <brooke at pacific.net>
> To: "Discussion of precise time and frequency measurement"
> <time-nuts at febo.com>
> Sent: Tuesday, May 15, 2012 10:05 AM
> Subject: Re: [time-nuts] Water Proof Vent
>
>
>
>> Hi:
>>
>> You might consider using a piece Tyvek material.  You can get it free from
>> the USPS in the form of a priority mailing envelope or at a construction
>> site where it's used to warp the outside of houses.
>> Passes water vapor and air but not water.
>>
>> Have Fun,
>>
>> Brooke Clarke
>> http://www.PRC68.com
>> http://www.end2partygovernment.com/Clarke4Congress.html
>>
>>
>>
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>
>
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