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What does thermosetting mean?

Looking for the meaning or definition of the word thermosetting? Here's what it means.

Adjective
  1. (chemistry) becoming permanently hard or solidifying when heated; used especially of synthetic plastics such as Bakelite.
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There are two major families of polymers: thermoplastics and thermosetting plastics, which have different characteristics and properties.
This thermosetting composite material is comprised of sheets that are molded, mainly through compression.
Since we wanted a system that was neither thermosetting nor filled, we had to develop a way to handle thermoplastics for compression moulding.
Two different groups of resins are available for hot mounting: thermoplastic and thermosetting.
This technology, known as reaction injection molding, accounts for much of the production of thermosetting elastomers made from polyurethane.
After polymerisation using heat, light, radiation, or catalysis a range of strong thermosetting plastics can be produced.

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