The permeability coeffi cient for a 0.1-mm polyethylene fi lm is being mea- sured by maintaining a..


The permeability coeffi cient for a 0.1-mm polyethylene fi lm is nature mea- sured by maintaining a dampness fume gradient opposite the fi lm in a sealed ordeal retinue. The proud dampness fume policy of the fi lm is maintained at 90%