A sterically hindered amine group, or SHA, is a type of amine functional group that is widely used in the polymer industry as a stabilizer and light stabilizer for polymeric materials. SHA compounds are characterized by their bulky structure, which allows them to scavenge free radicals and protect polymers against degradation caused by ultraviolet radiation, heat, and oxidative stress. Because of their high efficiency and low toxicity, SHA compounds are widely used in the production of plastics, coatings, adhesives, and other materials that require long-term stability and durability.