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A detailed investigation was made to determine experimentally the vapor permeability of a number of plastic thermal insulators used in refrigeration technology. The vapor permeability was determined by measuring the average quantity of water vapor that penetrates a 1 (sq m) area in one hour, through 1-m thickness, under a pressure of 1 newton/(sq m). The corresponding permeability coefficient is mathematically defined. A total of 23 different materials was tested, and the results were tabulated. It is shown from these results that most foam plastics have good vapor-insulation characteristics. The most homogeneous among the various foam plastics tested were the hard-foam poly-urethanes. (Author)

  • Supplemental Notes:
    • Edited Trans. of Kholodilnaya Tekhnika I Tekhnologiya (USSR) n4 p45-49 1967, by D. Koolbeck
  • Corporate Authors:

    Foreign Technology Division

    Wright-Patterson Air Force Base
    Dayton, OH  United States  45433
  • Authors:
    • Dudnik, D M
  • Publication Date: 1969-10

Media Info

  • Pagination: 9 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00015151
  • Record Type: Publication
  • Source Agency: Defense Documentation Center
  • Report/Paper Numbers: FTD-HT-23-541-68
  • Files: TRIS
  • Created Date: May 13 1971 12:00AM