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 <herbe...@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" <bro...@pacific.net> > To: "Discussion of precise time and frequency measurement" > <time-nuts@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 >> >> >> >> _______________________________________________ >> time-nuts mailing list -- time-nuts@febo.com >> To unsubscribe, go to >> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts >> and follow the instructions there. >> >> > > > > _______________________________________________ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
