A new polymeric membrane, very permeable to vapours is marketed to dry
plants under mild conditions. This membrane could also be used as a
packaging for safe transport of dryed plants until destination.
For example, wet harvested plants, placed in a hermetically sealed bag,
at least 20% w/w in the first 24 h.
Further it is also used for sacking crops (ex : grapes) in the fields,
avoiding to use chemicals.
May be you have other applications...
If you want to know more about, I could send you detailed information.