Safety considerations regarding the use of propane and other liquefied gases as coolants for rapid freezing purposes.

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  • Author(s): Ryan KP;Ryan KP; Liddicoat MI
  • Source:
    Journal of microscopy [J Microsc] 1987 Sep; Vol. 147 (Pt 3), pp. 337-40.
  • Publication Type:
    Journal Article
  • Language:
    English
  • Additional Information
    • Source:
      Publisher: Published for the Royal Microscopical Society by Blackwell Scientific Publications Country of Publication: England NLM ID: 0204522 Publication Model: Print Cited Medium: Print ISSN: 0022-2720 (Print) Linking ISSN: 00222720 NLM ISO Abbreviation: J Microsc Subsets: MEDLINE
    • Publication Information:
      Original Publication: Oxford, Published for the Royal Microscopical Society by Blackwell Scientific Publications.
    • Subject Terms:
      Equipment Safety* ; Ethane* ; Nitrogen* ; Propane*; Freezing/*instrumentation; Freezing/methods
    • Abstract:
      Liquid propane and similar coolants are used in the rapid freezing of biological specimens. These coolants form explosive gas mixtures with air, with a 14,000-fold increase in volume over that of the liquid. The liquefied gases have high vapour pressures and, unless they are maintained below their flashpoint, the vapour above them will reach ignitable concentrations. The flashpoint of liquid propane is -104 degrees C. Ethane has a higher vapour pressure, and vapour mixed with air above liquid ethane can be ignited at a coolant temperature of -130 degrees C. The danger is minimized if the coolant is maintained near its freezing point and under a nitrogen atmosphere, in a fume cupboard. Liquid nitrogen evaporates to a 690-fold increase in volume at room temperature. It is important to ventilate the working area, especially when cryo-sectioning in a small room, otherwise there is a possibility of asphyxiation.
    • Accession Number:
      L99N5N533T (Ethane)
      N762921K75 (Nitrogen)
      T75W9911L6 (Propane)
    • Publication Date:
      Date Created: 19870901 Date Completed: 19880226 Latest Revision: 20190903
    • Publication Date:
      20221213
    • Accession Number:
      10.1111/j.1365-2818.1987.tb02845.x
    • Accession Number:
      3430580