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Sulfur Dioxide So2/CH4/C4h10/So2/Sf6/H2s/HCl/Co 40L/47L Gas Cylinder. Industrial Bleaching: Effective for bleaching pulp, wool, silk, and straw hats in industry. Food Preservative: Inhibits mold and bacteria growth for food and dried fruit preservation. Flexible Shipping: Ships from HongKong, QingDao, Shanghai, or as per customer demand. Factory Visits: Customers are welcome to visit the Taiyu factory for inspection. Assurance Trade: Supports Assurance Trade Orders for purchasing empty gas cylinders.