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SESK: Stuff Everyone Should Know · sesk.info/eng-thermoplastic-reprocessing

Which polymer class can usually be softened, reshaped, and reprocessed by heating?

Thermoplastics can usually flow again when reheated.

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  1. Thermoplastics ✔
  2. Thermosets
  3. Fired ceramics

Why: Thermoplastic chains are not permanently locked into a crosslinked network. Heating can soften them enough for reshaping, although repeated processing may degrade performance.

Huh, didn't know that: Common extrusion and injection molding processes rely on thermoplastic flow at elevated temperature.

The dad joke
The thermoplastic asked for a redo because it could reshape its plans.
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References

Answer: Thermoplastics. Thermoplastic chains are not permanently locked into a crosslinked network. Heating can soften them enough for reshaping, although repeated processing may degrade performance.

  1. OpenStax Additive Manufacturing Essentials: Polymer Materials openstax.org/books/additive-manufacturing-essentials/pages/3-1-polymer-materials
    These materials can also be ground and reprocessed, although degradation in performance usually results from repeated recycling.
    Checked 2026-10-10.

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