PARAFILM® M SEALING FILM, HEATHROW

Moisture-proof film molds to surface. Parafilm® 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 organic solvents—use not recommended with acetone, diethyl ether or tetrachloride
• Protect the integrity of research applications with a tight moisture-barrier that holds a strong seal and doesn’t release from glassware, despite off-gassing
• Reduce the risk of tampered data with a covering that is odorless, colorless and semi-transparent
• Prevents moisture and volume loss due to material composition and tight seal
• Flexible and self-sealing material allows it to cling around irregular shapes and surfaces
• Stretches more than 200% of original length
• Resistant up to 48 hours against many polar substances such as saline solutions, inorganic acids and alkaline solutions
• Two color options available in 2” rolls (natural and purple) for color coding purposes
• Disposable 

Applications
Efficient and cost-effective covering for:

• Test tubes
• Beakers
• Vials
• Petri dishes
• Flasks
• Various other instruments and objects with irregular surfaces
• Overwrap to further secure stoppers, lids and caps
• Shelf or tray liner to prevent slipping of bottles or instruments

Permeability

• Oxygen: (ASTM 1927-98) 150 cc/m² d at 23°C and 50% RH
• Carbon Dioxide: (Modulated IR Method) 1200 cc/m² d at 23°C and 0% RH
• Water Vapor: (ASTM F1249-01)
• Flat: 1 g/m² d at 38°C and 90% RH
• Creased: 1 g/m² d at 38°C and 90% RH

Effects of Common Reagents
Potassium Permanganate

• 5%: No apparent effect except permanent dark brown coloration in 18 hours
• 0.1%: Same as 5% except slightly less color

Iodine solution (0.1N)

• No effect except staining brown in 18 hours

Ethyl Alcohol (95%)

• No apparent effect except some face whitening in 24 hours

No 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 solvents
• Film becomes soft and sticky at about 130°F to 150°F (68°C)

Parafilm® is a registered trademark of Bemis Company, Inc.