Ethyl 3,5-di-tert-butyl-4-hydroxybenzoate is primarily used as an antioxidant in various industrial applications. It is commonly added to polymers, plastics, and synthetic materials to prevent degradation caused by oxidation, which can lead to discoloration, brittleness, and loss of mechanical properties. This compound is particularly effective in stabilizing products exposed to heat, light, or oxygen, making it valuable in the manufacturing of automotive parts, packaging materials, and coatings. Additionally, it is utilized in the production of lubricants and fuels to enhance their shelf life and performance by inhibiting oxidative breakdown. Its ability to scavenge free radicals also makes it suitable for use in personal care products, where it helps protect formulations from spoilage and maintains product integrity.