Used primarily as a key intermediate in the synthesis of high-performance polymers, especially in the production of specialty polyesters and liquid crystalline polymers. Its chlorinated aromatic structure enhances thermal stability and chemical resistance in the final polymer products. It is also employed in the development of advanced materials for electronics, such as insulating layers and encapsulants, due to its ability to improve dielectric properties. Additionally, it serves as a building block in the preparation of functionalized isophthalic acid derivatives for coatings, adhesives, and flame-retardant materials.