答： Flame retardants mainly include organic and inorganic, halogen and non halogen. Organic is some flame retardants represented by bromine, nitrogen, red phosphorus and compounds, and inorganic is mainly antimony trioxide, magnesium hydroxide, aluminum hydroxide, silicon and other flame retardant systems. Generally speaking, organic flame retardants have a good affinity. In plastics, bromine flame retardants occupy an absolute advantage in organic flame retardant systems. Although they are "criticized" on environmental issues, they have been difficult to be replaced by other flame retardant systems. Flame retardants mainly include organic and inorganic, halogen and non halogen. Organic is some flame retardants represented by bromine series, nitrogen series, red phosphorus and compounds. Although there are many "criticisms" on environmental protection issues, it has been difficult to be replaced by other flame retardant systems.