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Familiar plastics like polyethylene and polystyrene are made from thermoplastic polymers that soften when heated but regain their original properties when cooled. With the Oh, the Memories! Polystyrene Demonstration—ChemTopic™ Lab Activity, heat a polystyrene cup to provide a dramatic illustration of this concept of plastic memory. Available as part of the Polymers—ChemTopic™ Labs digital collection. Click the Price link for digital collection pricing.