Epoxy hardener is a chemical component used with epoxy resin to start and complete the curing process When mixed with epoxy resin it reacts chemically to form a strong rigid and durable material The hardener controls how fast the epoxy cures and influences the final properties such as strength hardness heat resistance and chemical resistance Epoxy hardeners are commonly used in coatings adhesives composites flooring and protective finishes Different types of hardeners are selected based on application requirements curing time and environmental conditions