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Plastics are poor heat conductors, because they have virtually no free electrons available for conduction mechanisms like metals.

Why is plastic a good insulator?

Plastics are poor heat conductors, because they have virtually no free electrons available for conduction mechanisms like metals.

The thermal insulating capacity of plastics is rated by measuring the thermal conductivity. Thermal conduction is the transfer of heat from one part of a body to another with which it is in contact.

For amorphous plastics at 0-200°C, the thermal conductivity lies between 0.125-0.2 Wm-1K-1 Partially crystalline thermoplastics have ordered crystalline regions and hence better conductivity

Thermal insulation of a polymer (thermoplastics, foam or thermoset) is essential to: Understand processing of the material into final product Establish appropriate applications of the material e.g. polymeric foams for insulation

For example, BMC and SMC can be molded as a electrical material and used as standoff insulator support in battery, switchboard, and capacitor.