Curing agents are substances that invoke some sort of change chemically to solidify an object by changing a liquid or pliable material into a stable structure. With some polymers, for example epoxy, they undergo a cross-linking or polymerization process. Different curing agents serve different polymers. Epoxy uses amines, polyesters employs peroxides, and polyurethanes utilize isocyanates. These curing agents are selective and responsive having specific properties and mechanisms. They control the changes like curing time, hardness, flexing, and resistance to chemicals of the final product. Expectation-related performance, structural integrity, and functionality, for instance as an adhesive or as elements cast and shaped, require careful selection and application of the curing agents.
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