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Parafilm : Frequently asked questions


Is PARAFILM free of latex?

PARAFILM®M is free from plasticizers and consists primarily of polyolefins and paraffin waxes. If PARAFILM®M comes into contact with food, the relevant regulations should be observed.

At what temperature can I use PARAFILM?

Temperature range (continuous use): -45 to +50°C,
melting point: 60°C, flash point: 301°C

How long can I store PARAFILM?

Parafilm® M can be stored at least 3 years, without quality impairment, under storing conditions between 7 °C and 32 °C at 50 % relative humidity.

Is there any information available about the chemical resistance of PARAFILM?
PARAFILM®M is resistant up to 48 hours against many polar substances, e.g. saline solutions, inorganic acids and alkaline solutions. After this period embrittlement may occur.
Effects of 48 hours exposure at 23°C:
 Acids:  Hydrochloric acid 36.5% resistant 
  Sulphuric acid 98% resistant
   Nitric acid 95% resistant (brown discoloration)
 Alkaline solutions:  Sodium hydroxide 22% resistant 
   Ammonia 28% resistant 
Saline solutions:  Sodium chloride 20% resistant 
   Potassium permanganate 5% resistant (brown discoloration) 
   Iodine solution 0.1 mol/l resistant (brown discoloration) 
Organic solvents:  Methyl alcohol resistant 
   Ethyl alcohol resistant 
   Isopropyl alcohol resistant 
   Diethyl ether not resistant 
   Chloroform not resistant 
   Carbon tetrachloride not resistant 
   Benzene not resistant 
   Toluene not resistant 
PARAFILM®M conforms to the general requirements of the FDA (Federal Food, Drug and Cosmetic Act. USA) if used below 55°C. 

Is there any information about gas permability and water vapor permeability of PARAFILM.

Gas permeability in 24 hours at 23 °C and 50% relative humidity:
O2 (oxygen): ≤ 350cm³/m²
N2 (nitrogen): ≤ 105cm³/m²
CO2 (carbon dioxide): ≤ 1100cm³/m²

Water vapor permeability in 24 hours at 37 °C and 90% relative humidity: 0.8 g/m² (Vapor pressure from volatile substances may lift PARAFILM®M off the edge of the vessel.)

 PARAFILM is available from Uk stock at Camlab

10 thoughts on “Parafilm : Frequently asked questions

    1. Hi John,

      This would likely weaken the parafilm and then you may see tears or breaks – it is only meant for use up to +50°C at the most.

      – Camlab Team

  1. Hi, I recently started in a new lab and took over all materials and equipment from the previous person. When I used the parafilm, it tore more easy than I was used to. After incubation around my Agar plates it dissolved. But the temp was not higher than 40 degree. I have never encountered this before. Could it be too old or just a bad batch?

    1. Hi Tanja,

      Thanks for your question – sounds unusual! Parafilm is OK for use up to +50°C so as long as your incubator is accurate this should have been ok.
      It could just be age – can you see any dates on the box? Try a new pack and see if you encounter the same problem.

      Let us know if you need anything else

      Kind regards
      Camlab Support Team

  2. I sometimes read in sellers websites that it’s possible to “seal” the overlapping ends better by heating up the Parafilm slightly while pressing it together.
    Is that true or a false information?

  3. does parafilm react with oil-based creams. I am using it to cover the surface of cream much like you would use plastic wrap to cover pudding in the fridge. I want to protect the cream from air exposure prior to use.

  4. can you talk about what parafilm is made of I ran a sample in the FT-IR from my class and could not get a good match from the data. is there TRIACONTANE in it or low density polyethylene??

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