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Many plastics can be used for melting, but not all. Basically there are 2 types to distinguish here; thermoplastics and thermosetting plastics. Thermoplastics can be heated and shaped. Examples are HDPE, LDPE, PLA, and PP (see the Wikipedia link for a longer list of types) Thermosetting plastics harden or burn when heated. Examples are Phenolic (PF) resins, ...

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