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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.
The total thermal conductivity Ctotal of an open celled foam actually consists of four components as noted below: Ctotal = Csolid ligaments + Cgas + Cgas convection + Cradiant. Where. Csolid ligaments = the conductivity of the three-dimensional array of solid ligaments or struts that form the foam structure. This term is also often referred to as the bulk thermal conductivity of the foam. .33 = coefficient representing the foam structure geometric or tortuosity factor.