As a halogen-free flame retardant, the micro morphology of MC50 is spherical. It has the characteristics of excellent dispersion performance, less dust, less addition and excellent flame retardant performance. It is especially suitable for the flame retardant of unfilled or mineral filled nylon 6 and nylon 66. The addition amount is between 8% - 12%, and the flame retardant performance reaches UL94 V-0.