Product: Sodium Sulfide (Na₂S)

CAS No.: 1313-82-2 (Anhydrous) / 1313-84-4 (Hydrated)
Hazard Class: 8 (Corrosive) + 4.2 (Spontaneously Combustible)
UN No.: 1385 (Hydrated) / 1849 (Anhydrous)
Appearance: Yellow-to-red flakes (anhydrous) / White crystals (hydrated)

Description: Sodium sulfide is produced via carbon reduction of sodium sulfate (black ash process) or hydrogen sulfide absorption in caustic soda, functioning as a strong reducing agent and sulfuration compound. Its primary applications include leather depilation (breaks keratin disulfide bonds), pulp processing (kraft pulping), and metal ore flotation. The compound hydrolyzes in water to form caustic NaOH and H₂S gas (rotten egg odor), requiring strict moisture control during storage.