Ethoxyquin dimer is primarily used as an antioxidant in various industrial applications. It helps in preventing the oxidation of materials, thereby extending their shelf life and maintaining their quality. In the rubber industry, it is utilized to protect rubber products from degradation caused by exposure to oxygen and heat. Additionally, it finds application in the stabilization of certain polymers and plastics, ensuring they retain their properties over time. In the field of animal feed, it is sometimes used to preserve the nutritional value of feed ingredients by preventing oxidative damage. Its effectiveness in inhibiting oxidation makes it a valuable component in formulations where long-term stability is crucial.