Used as a highly efficient flame retardant in high-performance polymers due to its unique polyaromatic structure and phosphorus-nitrogen synergy. It imparts excellent thermal stability and char formation when incorporated into engineering plastics, particularly in electronics and aerospace applications where fire resistance is critical. Its bulky naphthalene groups enhance compatibility with aromatic polymer matrices without significantly compromising mechanical properties. Also shows promise in suppressing smoke generation during combustion, making it suitable for enclosed environments such as public transportation and building materials.