Flame retardants are also called flame retardants, fire retardants or fire retardants: functional additives that endow flammable polymers with flame retardancy; they are classified into additive flame retardants and reactive flame retardants according to their application. According to the composition, the additive flame retardant mainly includes inorganic flame retardant, halogen flame retardant (organic chloride and organic bromide), phosphorus flame retardant (red phosphorus, phosphoric acid ester and halogenated phosphoric acid ester, etc.) and nitrogen Department of flame retardants, etc. Reactive flame retardants are mostly organic halogen and organic phosphorus monomers containing reactive functional groups. In addition, molybdenum compounds, tin compounds, and iron compounds with smoke-suppressing effects also belong to the category of flame retardants. It is mainly suitable for plastics with flame retardant requirements to delay or prevent the burning of plastics, especially polymer plastics. Make it longer to ignite, self-extinguishing, and difficult to ignite.