Mkpụrụ osisi na akwụkwọ nri bụ ụdị fim na-akasi aka na obere pores na-enwe obere mmiri, gụnyere oke mmiri na-enweghị atụ, ma na-enweghị isi plastik na-emetụta ihe owuwu ahụ, na-enwe obere ihe owuwu a pores. However, the pores on micro porous plastic wrap are approximately closed, allowing for air permeability but not water permeability. The pores of the permeable film are not closed and are funnel-shaped. The shapes of the pores on the front and back sides of the film are different, allowing for one-way permeability.
