Ammonium polyphosphate is widely used as a flame retardant in various materials, including plastics, textiles, and coatings. It works by promoting the formation of a protective char layer when exposed to heat, which helps to prevent the spread of flames. In the construction industry, it is incorporated into materials like insulation, adhesives, and sealants to enhance fire safety. Additionally, it is utilized in the production of intumescent paints and coatings, which expand when heated to provide a fire-resistant barrier. Beyond its flame-retardant properties, it is also employed as a fertilizer in agriculture, where it serves as a source of phosphorus and nitrogen, supporting plant growth and improving soil fertility. Its versatility and effectiveness make it a valuable component in both industrial and agricultural applications.