ZR-3 is a halogen-free, low-smoke, non-toxic, and environmentally friendly inorganic phosphorus-based flame retardant. It exhibits excellent compatibility with substrates, high thermal stability, fine particle size, low specific gravity, and good dispersibility. As an inorganic flame retardant, it can be widely applied in plastics, rubber, coatings, and other fields. Additionally, it serves as a multifunctional synergistic additive that enhances the flame-retardant performance of other types of flame retardants such as aluminum hydroxide and magnesium hydroxide, while also adjusting the chemical, mechanical, and electrical properties of rubber and plastic products.