Moisture-proof film molds to surfaceParafilm® M is a semi-transparent, flexible, thermoplastic film with two-way stretch.Non-toxic and free from plasticizers, primarily composed of polyolefins and paraffin waxes offering good resistance against acids, alkalis and some solvents-use not recommended with acetone, diethyl ether or tetrachlorideProtect the integrity of research applications with a tight moisture-barrier that holds a strong seal and doesn't release from glassware, despite off-gassingReduce the risk of tampered data with a covering that is odorless, colorless and semi-transparentPrevents moisture and volume loss due to material composition and tight sealFlexible and self-sealing material allows it to cling around irregular shapes and surfacesStretches more than 200% of original lengthResistant up to 48 hours against many polar substances such as saline solutionsDisposable ApplicationsEfficient 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 instrumentsPermeabilityOxygen: (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% RHEffects of Common ReagentsPotassium 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%).