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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.
Styrofoam is a foam plastic that is made from styrene monomers. It is popular as an insulator in packaging and for food. There are hazardous chemicals in Styrofoam, including styrene and diethylhexyl adipate. When exposed to heat or acids, these chemicals can leach out of the Styrofoam in small amounts. This is partly why Styrofoam is not considered microwave-safe, as the plastic also breaks down easily.