INVESTIGATION OF THE VAPOR PERMEABILITY OF THERMAL INSULATION MATERIALS,
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)
Document Details
- Document Type
- Technical Report
- Publication Date
- Oct 04, 1969
- Accession Number
- AD0700795
Entities
People
- D. M. Dudnik
Organizations
- National Air and Space Intelligence Center