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After placing a dry solid block of nonporous plastic material in the freezer for a while, I was surprised to find out when I retrieved it that it had expanded globally by a few inches. Which type of plastic must this be and do plastics expand at colder temperatures?

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    $\begingroup$ Is the plastic material a solid block or a structure? Is it porous? What else was present? Was it wet? $\endgroup$ – Chemomechanics Nov 5 '20 at 23:38
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    $\begingroup$ a few INCHES??? $\endgroup$ – niels nielsen Nov 6 '20 at 5:42
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Materials with a negative thermal expansion (NTE) coefficient will increase in size as they are cooled down. Not all plastics have a NTE, but it is not a property seen only in one specific type of plastic. I don't think the plastic can be identified only knowing that it has a NTE.

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