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Glass is far inferior to paper, plastic and Styrofoam in terms of insulation. Thermal conductivity in terms of BTU/(feet - hour - degrees F) is 1.82 for glass, 0.09 for paper, 0.06 for Styrofoam. The conductivity of plastics varies depending on the materials: for polypropylene and polycarbonate, the thermal conductivity values are 0.69 and 0.35, respectively.
NIST published a numerical approximation routine for calculating the thermal conductivity of polyurethane at http://cryogenics.nist.gov/NewFiles/Polyurethane.html. Their calculation for freon filled polyurethane of density 1.99 lb/ft 3 at 20Â°C gives a thermal conductivity of 0.022 W/mK. The calculation for CO 2 filled polyurethane of density 2.00 lb/ft 3 gives 0.035 W/mK .