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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.
You can microwave for about 30 seconds and that should be the length of that. Believe it or not there are many different kinds of Styrofoam .My personal advice is to avoid microwaving Styrofoam all together, because the long term effects can be very harmful.irst of all, the article makes sure to point out that Styrofoam is a form of plastic so when discussion dangerous materials in a microwave, all forms of plastic are included. I found this very important because some people view Styrofoam as a completely different material than plastic.