Triisopropyl phosphite is widely used as a stabilizer in the production of polymers and plastics, where it helps prevent degradation caused by heat and oxidation. It is also employed as an intermediate in the synthesis of organophosphorus compounds, which are essential in various industrial applications, including lubricants and flame retardants. Additionally, it serves as a reducing agent in organic reactions, particularly in the preparation of phosphonates and other phosphorus-containing chemicals. Its role in the stabilization of PVC and other polymers makes it valuable in the manufacturing of durable materials. Furthermore, it is utilized in the production of agrochemicals, contributing to the development of pesticides and herbicides.