ZR-T0 is a phosphate-based flame retardant synergist characterized by excellent matrix compatibility, high reactivity, and superior dispersibility. Compatible with halogenated flame retardants, it finds extensive applications in plastics, rubbers, coatings, and related fields. Notably, it can replace up to 60% of antimony trioxide on an equal-weight basis in halogen-based flame retardant formulations while delivering outstanding cost-effectiveness.