Sterile. AeraSeal features a hydrophobic, gas permeable membrane with a medical grade, non-cytotoxic adhesive. The porous membrane consists of layers of heat welded rayon fibers. Pore size from 10µm to 50µm. Moisture vapor transmission rate = 4,200g/m²/24hr. Easy-to-pierce with serological pipets and pipet tips for direct sample recovery. Available in roll format for automation: AeraSeal Roll-Seal.