Used primarily in organic synthesis, it serves as a key reagent for introducing ethylphosphoryl groups into molecules. It is widely employed in the production of flame retardants, where it enhances the fire resistance of materials like plastics and textiles. Additionally, it plays a role in the synthesis of pesticides and herbicides, contributing to their effectiveness in agricultural applications. In pharmaceutical research, it is utilized to create intermediates for drug development, particularly in compounds targeting neurological disorders. Its reactivity with alcohols and amines makes it valuable for modifying polymers and coatings, improving their durability and performance.