DuraSeal Stretch Film, 1" x 150', Test Tube Seal. DuraSeal the durable, heat and solvent-resistant stretch film, has substantial advantages over common laboratory stretch films. Its superior heat-resistant feature allows for containers to be incubated in boiling water baths without suffering the characteristic melting of paraffin-based alternatives. Since DuraSeal is polyethylene based and free of any adhesives, it resists essentially all caustic agents and organic solvents. Permeability Information:Oxygen = 125cc/100in2/24hrs at 23C. Carbon Dioxide = 1300cc/100in2/24hrs at 23C. Water Vapor = 1.0g/100in2/24hrs at 38C and 90% R.H. (vs a desiccant on opposite surface)