Food Grade Sodium Metabisulfite Molecular Formula: Na?S?O? CAS No.: 7681-57-4 Grade: Food Grade Content: 96% Product Specifications: Item | Specification --- | --- Main Content (as Na?S?O?), % | ≥95.0 Iron Content (as Fe), % | ≤0.005 Clarity | Slightly Turbid Heavy Metals (as Pb), % | ≤0.001 Arsenic (as As), % | ≤0.0002 Packaging: 25 kg/bag Applications: Food grade sodium metabisulfite is mainly used as a preservative, bleaching agent, leavening agent, and in the synthesis of organic pharmaceuticals in food processing. Industrial grade sodium metabisulfite is primarily applied in industries such as printing and dyeing, organic synthesis, printing, leather making, colored cement, and wastewater treatment.