Non‑Halogen Reactive Phosphorus Polyol Flame Retardant for Versatile PU Formulations Clariant OP560 Equivalent IFR‑OP560 represents a high‑efficiency reactive non‑halogenated phosphorus polyol formulated to match the processing behavior and final‑part performance of Clariant Exolit OP560. This liquid flame‑retardant polyol co‑reacts with isocyanate groups throughout polyurethane curing, firmly embedding phosphorus‑based fire‑resistant segments within the PU network. There is