Sirgel Curing Agents HTP-308 and HTP-309 are accelerated dicyandiamide types. They react with epoxy resins via the dicyandiamide part in both catalytic and addition types of reactions. Sirgel Curing Agents HTP-308 is typically applied in functional or ornamental thick film powder coatings. Sirgel Curing Agent HTP-309 is typically used to make decorative powders with thin films.