IFR‑OP560 Eco‑Friendly Reactive Non‑Halogen Phosphorus Polyol Flame Retardant for Multi‑Industrial PU Designed for environmentally‑oriented polyurethane modification, IFR‑OP560 is a high‑efficiency reactive non‑halogenated phosphorus polyol acting as a drop‑in alternative to Clariant Exolit OP560. Thanks to its reactive polyol structure, it participates in PU polymerization reactions and covalently anchors fire‑resistant moieties inside polymer networks. The chemical‑bonding