Trilauryl trithiophosphite is primarily used as an antioxidant and stabilizer in the production of polymers, particularly in the rubber and plastic industries. It helps prevent degradation caused by heat, light, and oxidation during processing and storage, thereby extending the lifespan of the materials. Additionally, it acts as a sulfur donor in vulcanization processes, improving the elasticity and durability of rubber products. Its application is also seen in lubricants and greases, where it enhances thermal stability and reduces wear and tear on machinery components.