Diphenyl terephthalate is primarily used as a monomer in the production of high-performance polymers, such as polyesters and polyarylates. These polymers are valued for their excellent thermal stability, mechanical strength, and chemical resistance, making them suitable for applications in the automotive, aerospace, and electronics industries. Additionally, it serves as an intermediate in the synthesis of liquid crystal polymers (LCPs), which are utilized in advanced display technologies and high-temperature engineering plastics. Its role in enhancing the durability and performance of materials makes it a key component in the development of innovative industrial and technological products.