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Heathrow Scientific

Parafilm® Sealing Film

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Parafilm® Sealing Film

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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

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


  • 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)

This parafilm protects the integrity of your laboratory and research applications with a tight moisture-barrier that holds a strong seal and doesn’t release from glassware. It also prevents moisture and volume loss due to the material composition and tight seal. It can also stretch more than 200% of its original length and is disposable.

Order a dispenser separately (1222J96/J97/J98).

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


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