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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.
It turns out that thermal conductivity is directional, just like refractive index, in all but isotropic (isometric or amorphous) materials. The symmetry of optical and thermal properties is usually the same, but very few measurements on the variation of conductivity with direction have been made on gem materials.Thermal inertia is a measure of how quickly the surface temperature of a material can be changed by a flow of heat into the material.he higher the thermal diffusivity of a material, the faster it will pass heat energy from one point to another. Thermal conductivity, on the other hand, is a ratio of the flow of heat through a given thickness of material to the temperature difference across this thickness.