Been trying to find more information on Tyvek

Tyvek - Wikipedia, the free encyclopedia

Tyvek (pronounced /taɪˈvɛk/) is a brand of flashspun high-density polyethylene fibers, a synthetic material; the name is a registered trademark of DuPont. The material is very strong; it is difficult to tear but can easily be cut with scissors or any other sharp object. Water vapor can pass through Tyvek (highly breathable), but not liquid water, so the material lends itself to a variety of applications: medical packaging, envelopes, car covers, air and water intrusion barriers (housewrap) under house siding, labels, wristbands, mycology, and graphics. Tyvek is sometimes erroneously referred to as "Tyvex."
I'm not sure how much water vapor passes through; reason being is that in addition to tyveks ability to create a sterile environment... I also use it to maintain high humidity levels; which would lead me to believe that it *shouldnt* lose too much moisture but was hoping that someone with a little more insight than me could help.

I'll definitely set aside a jar and try this if I can't get an answer.