Used primarily in the production of polyethylene terephthalate (PET), a key polymer for manufacturing plastic bottles, films, and textile fibers. Its high purity ensures consistent quality in PET resins, making it essential in packaging industries for beverages, food, and synthetic fabrics. Also utilized in producing engineering plastics and liquid crystal polymers due to its thermal stability and mechanical strength. Small amounts are used in coatings, adhesives, and as a building block in specialty chemicals.