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An exotherm is an uncontrollable reaction between a solvent-free resin and hardener. This reaction occurs when heat generated by the resin-hardener reaction cannot readily escape. The trapped heat accelerates the reaction, further generating more heat and accelerating the reaction until it becomes uncontrollable. This reaction generally only occurs in bulk mixes, since mixed resin is usually applied in a thin film (such as a coating, glue line, laminate layer or filler layer) from which heat can readily escape.

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