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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


  • 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% NH<sub>3</sub>)
    • 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)

Bemis™ Parafilm™ M Laboratory Wrapping Film

SKU: 13-374-12
  • Applications Efficient and cost-effective covering, over wrap to further secure stoppers, lids, and caps, and shelf or tray liner to prevent slipping of bottles or instruments.
    Item Description Size: 4 in x 250 ft./roll
    Width (English) 4 in.
    Length (Metric) 76 m
    Length (English) 250 ft.
    Product Type Sealing Film
    Width (Metric) 10 cm
    Material Thermoplastic

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