Plastic is a poor conductor of heat because it has no delocalised electrons which aid in thermal transfer. It is thus an insulator. The number of delocalised electrons in a substance determines its ability to transfer heat.
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Nirmit Shah answered this
Plastic is a poor conductor of heat because it has no delocalised electrons which aid in thermal transfer. It is thus an insulator. The number of delocalised electrons in a substance determines its ability to transfer heat.