Sodium Bisulfite Anhydrous FCC is used as a catalyst, reducing agent, and preservative , as a reducing agent in sulfites to sulfates conversion, as a food preservative in the food industry, a bleach for wool for the textile industry, as a reducer in laundry, a antiseptic in fermentation and an additive for copper and brass plating. It is used in brewing barrels, dyeing vats, and paper production and, in fixing baths for photography. Its used in cosmetics as a reducing agent in hair waving and straightening hair products. Sodium Bisulfite Anhydrous FCC (Wintersun) WCode: 19-085-001 Sales Specifications Molecular Formula: NaHSO3 Molecular Weight: 104.06 Appearance: White Crystal Grain Main Content (as NaHSO3): 99% Min Water-Insolube: 0.03% max Chloride (Cl): 0.05% max Iron (Fe): 0.004% max Heavy Metal (Pb): 0.001% max Arsenic (As): 0.0002% max Packing 50 LB Paper Bag, 44 Bags per Pallet