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I believe that wrapping the plastic does reduce the absorption of radiated heat and therefore the increase in the plastic body temperature will be less.
google plastic for auto and got DuPont zitel PA66 is one of such plastic.
can't find thermal conductivity nor thermal emission (absorption) coefficient.
as a norm, plastics do not have strong thermal conductivity and emission/absorption.
so i'm wondering how much of an influence does the manifold have.
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