Highly effective reactive, non-halogenated phosphorus polyol OP560 Non-halogenated phosphorus polyol PU foam flame retardant IFR-OP560 is a flame retardant specifically designed for flame-retarded polyurethane polymers, such as foams or elastomers. The product is a reactive flame retardant that can be chemically reacted into the PU matrix, preventing unwanted migration from the material. Therefore, very stringent emission standards for PU flexible foams can be achieved. This