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Plastic is an insulator. but most of the paper is not insulated, because the paper in general contains water, although the content is very low, but enough to pass current, but there also is a special insulation paper, that is on the special purpose.

so in dry conditions, and the cup has no water, a plastic cup is a better insulator than a paper cup.

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Q: Is a plastic cup a better insulator than a paper cup?
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