Flame retardant Types are classified into four principal chemistries, each encompassing distinct sub‑categories that influence performance, cost, and regulatory acceptance. Halogenated retardants, split into brominated and chlorinated families, provide high efficiency at low loadings but face increasing restrictions due to toxicity concerns, limiting their growth potential. Phosphorus‑based variants include organic phosphates (e.g., organophosphates, phosphonates) and inorganic phosphates (e.g., ammonium polyphosphate), offering a balance of flame inhibition and reduced environmental impact, thereby gaining market share in electronics and construction. Inorganic retardants, such as metal hydroxides (magnesium, aluminum hydroxide) and metal oxides (zinc borate), are favored in applications requiring high thermal stability and low smoke generation, notably in automotive interiors and aerospace composites. Nitrogen‑based compounds, primarily melamine and melamine cyanurate, deliver synergistic effects when combined with phosphorus or inorganic agents, enhancing char formation in textiles and furniture foams. The relative adoption of these types is shaped by evolving safety standards, cost considerations, and the shift toward halogen‑free solutions.