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Answer for the clue "Plastic that can be made permanently rigid ", 9 letters:
thermoset

Word definitions for thermoset in dictionaries

Wiktionary Word definitions in Wiktionary
n. A thermosetting plastic

WordNet Word definitions in WordNet
adj. having the property of becoming permanently hard and rigid when heated or cured; "the phenol resins and plastics were the original synthetic thermosetting materials" [syn: thermosetting ] [ant: thermoplastic ]

Usage examples of thermoset.

To be on the safe side he emplaced a second ring with the thermoset adhesive.

Molly Pardon herself was pictured, a fifty-year-old bleached-blond giantess rendered in thermoset plastic.