Sodium Nitrite is an inorganic compound with the chemical formula NaNO2. it is a white to slightly yellow crystalline powder, extremely soluble in water and hygroscopic. It is the most important nitrite from an industrial point of view. It is a precursor to various organic compounds such as pharmaceuticals, dyes and insecticides. The main use of sodium nitrite is in the industrial production of organic nitrogen compounds. It is a reagent that converts amines into diazo compounds, which are key precursors for many dyes, such as diazo dyes. Nitroso compounds are produced from nitrites. These are used in the rubber industry. It is used in various metallurgical applications for phosphatization and degreasing. Sodium nitrite is an effective corrosion inhibitor and is used as an additive in industrial greases, as an aqueous solution in closed-loop cooling systems, and as a heat transfer medium in the molten state.