XF - 8501Y is a phosphorus - and - salt - composite halogen - free flame retardant, and the product complies with ROHS requirements. When XF - 8501Y is added to polyamide resin, it will foam and expand on the surface of the resin during heat cracking or combustion, forming a porous carbon layer. This carbon layer plays roles in heat insulation, oxygen isolation, flame retardancy, and can prevent dripping. The flame retardant also has a certain effect on suppressing smoke generation, and does not produce toxic or corrosive gases. In addition, XF - 8501Y has no water absorption and no exudation, and exhibits excellent thermal stability and processing performance. The molded products have characteristics such as resistance to baking and boiling water, and can pass the double 85 test. It is an ideal and efficient environmentally - friendly flame retardant.