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)
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