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Plastic. In general, metals are good conductors, plastics are bad conductors. You didn't specify whether you wanted heat insulation or electrical insultation, but the above applies to both.

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βˆ™ 15y ago
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βˆ™ 7mo ago

Aluminum is a better insulator than plastic because it has a lower thermal conductivity. This means that aluminum is better at preventing the transfer of heat than plastic. However, plastic can be better at blocking sound and electrical conductivity.

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Q: What insulates better aluminum or plastic?
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