The melamine cyanurate flame retardants usually used in nylon are not corrosive, but during the process of thermal degradation or oxidative degradation, some flame retardants can produce acidic substances, which will cause corrosion to the equipment during extrusion processing and molding. In the process, the corroded connected metal components will cause some corrosion after burning. From the above test results of the volatile matter concentration of flame retardant nylon 66, it can be seen that the concentration of nitrogen oxides released by MCA flame retardant nylon 66 during combustion is equivalent to that of pure nylon, and there is no strong acid halide, and phosphorus flame retardants have Residual acid substances, so melamine cyanurate is the least corrosive of existing nylon flame retardant systems.