Submitted by Athousandlipsticks t3_10bvhgz in askscience
Coomb t1_j4hlulq wrote
Reply to comment by PD_31 in Why do kitchen bags not melt but harden when exposed to a heat gun ? by Athousandlipsticks
Standard lightweight plastic grocery bags are generally low density polyethylene, which has a glass transition temperature well below room temperature without plasticizers. What's more likely to be happening is some combination of crystallization and thermal breakdown of the polymer.
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