Re: [time-nuts] Water Proof Vent
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 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" > To: "Discussion of precise time and frequency measurement" > > 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.
Re: [time-nuts] Water Proof Vent
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" To: "Discussion of precise time and frequency measurement" 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.
Re: [time-nuts] Water Proof Vent
On 5/15/12 9:05 AM, Brooke Clarke wrote: 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. I don't know that all things labeled as Tyvek have that semi-porous property.There are hazmat suits made of Tyvek, and I doubt they're porous. According to Dupont, Tyvek (r) is a whole family of spun bonded olefin stuff (polyethylene fibers that are matted and melted). It can be made in a variety of forms, some porous, some not. http://www2.dupont.com/Tyvek/en_US/products/structure_types.html type 16 is used in disposable garments and is perforated with tiny holes (much like GoreTex is). 130-510 microns, which is pretty big, compared to GoreTex (around 1 micron holes) ___ 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.
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.
