Commodity Name: Sodium P-Toluenesulfinate Tetrahydrate; P-Toluenesulfinic Acid Sodium Salt Tetrahydrate; P-Toluene Sulfinic Acid Sodium·Tetrahydrate Molecular Formula: C7H7O2SNa·4H2O Molecular structure: CAS NO.: 868858-48-4 Appearance: White Crystalline Powder Purity: 98% min Loss On Drying: 25-35% PH: 8.0-10.0 Insoluble Matter In Water(H2O 20% Soln): clear & colorless Heavy Metal: 20ppm max Sulfate: 0.2% max Chloride: 0.5% max Iron: 10ppm max Packing: 25kg woven bag or 25kg net fibre drum