Curing is a term in polymer chemistry and process engineering that refers to the toughening or hardening of a polymer material by cross-linking of polymer chains, brought about by chemical additives, ultraviolet radiation, electron beam or heat. In rubber, the curing process is also called vulcanization.

Concrete curing is a process where the Portland cement in concrete is allowed to react with the water over time, increasing the concrete's strength and hardness. This process can be sped up by use of a cement accelerator.