P-N Intumescent Flame Retardant IFR-P200B for Polypropylene Halogen-free flame retardant (HFFR) for PP in extrusion and injection moulding IFR-P200B INTRODUCTION: IFR-P200B, mainly contains N and P, is a kind of halogen free environmentally friendly flame retardant for polyolefin. It was developed especially for various PP products, and can be used in other polyolefin products as well. With acid source, gas source and carbon source, IFR-P200B takes effect by char formation