Sodium metabisulfite (Na2S2O5, CAS 7681-57-4) is a white crystalline powder that is soluble in water and glycerin. Also known as sodium disulfite or SMBS, it is a strong reducing agent commonly used as a preservative, antioxidant, and bleaching agent.
Sodium metabisulfite is commonly used in water treatment, mining, pulp and paper, food processing, and other industrial applications.
