Parafilm™ M Laboratory Wrapping Film

• 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

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° to 150°F (54° to 66°C)