Linked from
The 11 pages that link to Thermosetting polymer, each with the reason it gives.
PolymerBroader topic: Its network cannot be remelted like a typical thermoplastic.
ThermoplasticCompared with: Unlike a thermoplastic, it does not regain melt flow after curing.
Cross-linkBroader topic: Its extensive cross-linking gives it shape stability after curing.
BakeliteNarrower topic: Bakelite’s cured network makes it rigid and resistant to heat.