Permanent Halogen‑Free Reactive Phosphorus‑Polyol Flame Retardan Replacement for Clariant Exolit OP560 Permanent Halogen‑Free Reactive Phosphorus‑Polyol Flame Retardant Replace Clariant Exolit OP560 IFR‑OP560 is a reactive non‑halogenated phosphorus polyol flame retardant developed as a reliable substitute for Clariant Exolit OP560, delivering long‑lasting fire‑safety performance for polyurethane goods. Since its phosphorus‑containing functional groups are chemically