Parafilm PM992 All-Purpose Thermoplastic Laboratory Film 2″x250′ , 3 pack

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. Efficient and cost-effective covering for: Test tubesBeakersVialsPetri dishesFlasksVarious other instruments and objects with irregular surfacesOverwrap to further secure stoppers, lids and capsShelf or tray liner to prevent slipping of bottles or instruments Permeability Oxygen: (ASTM 1927-98) 150 cc/m² d at 23°C and 50% RHCarbon Dioxide: (Modulated IR Method) 1200 cc/m² d at 23°C and 0% RHWater Vapor: (ASTM F1249-01)Flat: 1 g/m² d at 38°C and 90% RHCreased: 1 g/m² d at 38°C and 90% RH Effects of Common Reagents Potassium Permanganate5%: No apparent effect except permanent dark brown coloration in 18 hours0.1%: Same as 5% except slightly less colorIodine solution (0.1N)No effect except staining brown in 18 hoursEthyl Alcohol (95%)No apparent effect except some face whitening in 24 hoursNo apparent effect in 24 hours:Hydrochloric Acid conc. (12N)dil. (5n)Sulphuric Acid conc. (36n) dil. (5n)Nitric Acid conc. (16n) dil. (5n)Sodium Hydroxide conc. (22%)Ammonium Hydroxide conc. (28% NH3)Salt (NACL) solution (20%)Isopropyl Alcohol (99%)Not recommended for use with chlorinated, non-polar aliphatic and aromatic solventsFilm becomes soft and sticky at about 130°F to 150°F (68°C)