Introduction: Suitable for fields such as rail transit and building materials, where rubber products require high flame retardancy. The rubber product with a thickness of 1mm added to this product can meet the UL94-VO combustion requirements. This product is a phosphorus nitrogen composite flame retardant that achieves flame retardant effect through the mechanisms of expansion, carbonization, and insulation. It does not contain halogen elements or heavy metal elements, and has characteristics such as low density and low smoke production, meeting environmental requirements such as REACH and RoHS.