P-N Intumescent Flame Retardant IFR-P100A for PP Polypropylene Flame Retardant IFR-P100A Passing UL94 V0 for Polypropylene INTRODUCTION: Looking for a halogen-free flame retardant that lets polypropylene meet demanding fire-safety standards without sacrificing processability or environmental compliance? IFR-P100A is a nitrogen–phosphorus based, eco-friendly flame retardant built specifically for polyolefin applications, and it stands apart from conventional APP-based systems.