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Well, this would depend on the type of plastic, as plastics are synthetic materials they vary tremendously in their chemical compositions. Most plastics however have quite a low heat capacity and in general plastic insulating materials have volumetric heat capacities of ~0.130x10^6 J/m^3*K (@20deg C) or lower. In addition they have low thermal conductivities of 0.03 W/mK (only 0.005 higher then air!). Hope this helped if you were still looking for your answer.

[Disclaimer: This post is purely for educational purposes and should not be taken as precise scientific measurements. In other words don't use this information to try to build something that might explode if this answer is not completely accurate.]

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17y ago

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Should thermos have high or low heat capacity?

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