Bemis™ Parafilm™ M Laboratory Wrapping Film – Each / Case of 12 EA

Efficient and cost-effective covering for test tubes, beakers, vials, petri dishes, flasks, and various other instruments and objects with irregular surfaces.

• 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).

Order Info

13-374-10, 13-374-12, and 13-374-16 rolls are packaged in cardboard dispensing cartons.