RPM series halogen-free flame retardant has excellent thermal stability and mechanical properties, wider processing window, and less precipitation under humid and hot environment. It is suitable for flame retardant of PPA, PA66, PA6 and PBT. They have very good characteristics, including low phosphoric acid, low corrosion to metal and low PH3 release. And have high flame retardant efficiency with low addition, and exert little impact on the physical low density, high quality with low price, no dust pollution, easy to process and homogeneous dispersion, high comparative tracking index (CTI).