Used as a key intermediate in the production of high-purity terephthalic acid, which is essential for manufacturing specialty polyesters. It serves as a less corrosive alternative to dimethyl terephthalate in ester interchange reactions, particularly in the synthesis of engineering plastics and optical resins. Its higher boiling point and lower reactivity allow for better process control during polymerization, improving the thermal and mechanical properties of the final polymer. Also employed in the formulation of plasticizers for improved flexibility and durability in coatings and films.