Definition

Noun A material that undergoes a permanent chemical change when heated, resulting in a hardened, rigid structure that cannot be softened or remolded by subsequent heating.

Usage

This term refers to a class of polymers or composite materials. Once cured through the application of heat, these compositions form irreversible cross-links, making them infusible and insoluble.

Examples

• The electrical connectors were encapsulated in thermosetting compositions for durability and heat resistance.
• Thermosetting compositions like epoxy resins are essential in manufacturing circuit boards.
• Unlike thermoplastics, thermosetting compositions cannot be recycled by melting.

Advanced Usage

• "Cure a thermosetting composition": To subject the material to the heat process that causes it to harden permanently.
  • The mold must be heated to 150°C to properly cure the thermosetting composition.
• Used attributively to describe a type of material or process.
  • The part is made using a thermosetting composition molding technique.

Variants and Related Words

• Thermoset (noun/adjective): A common shortened form.
  • Bakelite is an early example of a thermoset.
• Thermosetting resin (noun phrase): A more specific term often used interchangeably.
• Thermosetting polymer (noun phrase): A technical synonym focusing on the chemical structure.

Synonyms

• Thermoset polymer
• Thermosetting plastic
• Thermosetting resin

Antonyms

• Thermoplastic composition (a material that softens when heated and hardens when cooled, able to be remolded)

Noun

1. a material that hardens when heated and cannot be remolded