INVESTIGATIONS OF THE VAPOR PERMEABILITY OF THERMAL INSULATION MATERIALS

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

• TRT Terms: Heat insulating materials; Permeability; Plastics; Refrigeration systems
• Subject Areas: Marine Transportation; Materials;

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