Definition
The specific temperature at which a thermosetting resin, adhesive, or composite material undergoes the chemical reaction that hardens it into its final, solid form. In aircraft composite and bonded repair work, the cure temperature must be reached and held for a specified time so the material develops its designed strength.
Plain English
The temperature a glue, resin, or composite patch needs to reach so it sets properly and becomes strong. Too cold and it won't fully harden; too hot and it can be damaged.
Context Anchor
Seen in aircraft maintenance instructions for composite repairs, bonded parts, sealants, coatings, and other materials that must harden under controlled conditions.
Derivation
‘Cure’ comes from the Latin cura, meaning ‘care’ or ‘treatment.’ In materials work it means treating something — usually with heat — to bring it to its finished state. So a cure temperature is the heat level needed to finish the treatment.
Why Pilots Care
Using the correct cure temperature ensures repaired composite parts regain their designed strength; wrong temperature produces weak bonds that can fail in flight.
Analogy
Like baking a cake at the precise oven temperature listed in the recipe so it sets properly instead of remaining gooey or becoming brittle.
Grounding Statement
The material has to get warm enough, for long enough, to harden the way the manufacturer intended.
Intuition Check
Cure here does not mean healing, and cure temperature is not just the room temperature nearby. It means the required temperature of the material during the hardening process.
Example Sentence 1
The technician used a heat blanket to bring the composite repair up to its cure temperature and held it there for the full time specified by the manufacturer.
Example Sentence 2
Exceeding the recommended cure temperature can cause the resin to degrade and reduce the strength of the bonded patch.