Epoxy resin hardener is a chemical substance used to cure or harden epoxy resins. It is typically a type of amine or anhydride that reacts with the epoxy resin to form a strong durable and rigid solid. When mixed with epoxy resin in the correct ratio the hardener initiates a chemical reaction called polymerization. This reaction transforms the liquid mixture into a solid thermoset material. Epoxy resin hardeners are widely used in construction electronics automotive marine and art applications due to their excellent bonding strength chemical resistance and durability. Proper handling and mixing are essential to achieve optimal results.