Used as a flame retardant additive in polymers, particularly in polyurethane foams and epoxy resins. It functions by promoting char formation during combustion, reducing flammability and slowing the spread of fire. Its cyclic phosphate structure enhances thermal stability and compatibility with resin systems, making it suitable for coatings, adhesives, and electronic encapsulants where fire safety is critical. Also employed in electrolytes for lithium-ion batteries to improve thermal safety and reduce flammability without significantly compromising ionic conductivity.