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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.
Polytec TC 301 is a standard single component, thermally conductive epoxy with excellent thermal conductivity. It was designed for all applications where heat transfer is essential (heat-sinking, aluminum or ceramic packaging).olytec TC 437 is a two-component, thermally conductive electrically insulating epoxy which can be cured at room temperature within 16 hours. Typically applications include attaching heat sinks, thermally conductive underfill, thermistor potting, die attach and heat management for power semiconductor devices.