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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.
Thermal conductivity of graphite used for continuous casting molds is in the range 560-960 BTU*in/hr*ftÂ²*ÂºF (80-140 W/m*K), which is comparable to thermal conductivity of metals: aluminum 1540 BTU*in/hr*ftÂ²*ÂºF (222 W/m*K); steel 450 BTU*in/hr*ftÂ²*ÂºF (65 W/m*K).