Protect the integrity of your laboratory and research applications by keeping moisture loss to a minimum and shield the contents of your items with a flexible covering and overwrap. » Prevents moisture and volume loss due to material composition and seal strength Reduce the risk of tampered data Allows for off-gassing while still creating a tight moisture-barrier Odorless, colorless and semi-transparent» Self-sealing and pliability allows Parafilm M to cling around irregular shapes and surfaces Permeability to oxygen, carbon dioxide and water vapor Ideal covering for test tubes, beakers, petri dishes, flasks and more Overwrap to further secure stoppers, lids and caps» Stretches to more than 200% of its original length.