Halogen-free flame retardant IFR-RB6001 Halogen Free Flame Retardant IFR RB6001 Designed to Improve Fire Safety in PA/PET/PBT Introduction: IFR-RB6001 is a halogen-free flame retardant based on aluminum salt of organic phosphonic acid. It is a white powder with low dust, high hydrophobicity, heat resistance and non-migratory. It is widely used for high performance flame retardant engineering plastics such as polyester (PET, PBT) and PA (glass fiber reinforced and unreinforced