PBT Halogen-free flame retardant IFR-RB6022 Passing UL94 V0 IFR-RB6022 Introduction: IFR-RB6022 is a specially treated high-temperature resistant organic phosphine salt halogen-free flame retardant, which is in a white powder form. Due to its excellent heat resistance stability, small addition amount, excellent mechanical properties, good color, low combustion smoke density, and high CTI value. Specifications: Item Unit Standards Phosphorous Content %(w/w) ≥23% Density g/cm3