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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 thermal conductivity of Polyethylene is 0.4 W/m per ËC. Thermal expansion is the tendency for any material to either expand or contract due to changes in temperature. All materials will exhibit this property, but some may be affected to a greater extent than others.