Accession Number : AD0700795

Title :   INVESTIGATION OF THE VAPOR PERMEABILITY OF THERMAL INSULATION MATERIALS,

Corporate Author : FOREIGN TECHNOLOGY DIV WRIGHT-PATTERSON AFB OHIO

Personal Author(s) : Dudnik,D. M.

Report Date : 04 OCT 1969

Pagination or Media Count : 9

Abstract : 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)

Descriptors :   (*THERMAL INSULATION, PERMEABILITY), (*WATER VAPOR, PENETRATION), (*EXPANDED PLASTICS, PERMEABILITY), ISOCYANATE PLASTICS, MOISTUREPROOFING, REFRIGERATION SYSTEMS, MATERIALS, PHYSICAL PROPERTIES, SURFACES, FILMS, HEAT TRANSFER, USSR

Subject Categories : Miscellaneous Materials
      Air Condition, Heating, Lighting & Ventilating

Distribution Statement : APPROVED FOR PUBLIC RELEASE