Used primarily as a flame retardant in engineering thermoplastics such as polycarbonate (PC), polybutylene terephthalate (PBT), and PC/ABS blends. It is especially effective in electronic components like connectors, switches, and circuit breakers where high thermal stability and flame resistance are required. Offers good compatibility with polymers, maintaining mechanical strength and clarity while meeting stringent flammability standards such as UL94 V-0. Also functions as a plasticizer in some specialty applications, improving flexibility and processability without significantly lowering the glass transition temperature. Commonly found in automotive, electronics, and electrical insulation materials.