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2.
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3.
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4.
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5.
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6.
Varland, R.H. , Atlas Chemical Industries, Inc.; "Rigid Urethane Foam Insulation: Report on Long-Term K-factor Aging Studies"; presented at the American Society of Heating, Air Conditioning and Refrigerating Engineers, January 26, 1966, Houston, Texas.
7.
Nadeau, H.G., Sayigh, A.A.R., Waszeciak, R.H., TheUpjohn Company; "A Method for Determination of the Cellular Gas Content of Rigid Urethane Foam and Its Relationship to Thermoconductivity"; National Academy of Sciences, National Research Council Publication No. 1462, 1976, pp. 109-122.
8.
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9.
Levy, M.M., Pittsburgh Corning Corporation; "Moisture Vapor Transmission and Its Effect on Thermal Efficiency of Foam Plastics"; Journal of Cellular Plastics, January, 1966, pp. 37-45.
10.
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11.
12. E. I. du Pont de Nemours and Company brochure E-08934, "Properties of Rigid Urethane Foams."