Ammonium polyphosphate (APP, CAS: 68333-79-9) is an inorganic salt of polyphosphoric acid and ammonia, with the general formula [NH₄PO₃]ₙ(OH)₂. As one of the most commercially significant halogen-free flame retardants, APP has become the backbone of modern intumescent fire protection systems across coatings, plastics, textiles, and construction materials.
Nickel chloride hexahydrate is an important inorganic salt of nickel. It is used for electroplating, catalyst preparation, chemical synthesis, laboratory research. Its water-solubility and its ability to furnish nickel ions make it useful in a number of industrial processes.
