Used as a flame retardant in polymers, particularly in engineering plastics and epoxy resins. Its structure allows for high thermal stability and effective char formation during combustion, which helps suppress fire propagation. Commonly applied in electronic components, circuit boards, and insulation materials where fire safety is critical. Also functions as a crosslinking agent in some resin systems, enhancing mechanical and thermal resistance. Shows good compatibility with aromatic polymers and maintains material clarity in transparent applications.