Tributyl phosphite is widely used as a stabilizer and antioxidant in the production of polymers and plastics, particularly PVC, to prevent degradation caused by heat and light. It also serves as an intermediate in the synthesis of various organophosphorus compounds, which are essential in agrochemicals and flame retardants. In lubricant formulations, it acts as an anti-wear additive, enhancing the performance and longevity of machinery. Additionally, it is employed in the preparation of specialty chemicals, including catalysts and surfactants, due to its ability to modify chemical reactivity and improve process efficiency.