Uses: It is mainly used as bleaching agent for processing leathers,fabric and organic matter,medium colouring agent for printing and dyeing;germicide and antiseptic for food preserving,brewing and beverage. It is also used as auxiliary material for synthetic dyes,perfume and photographic fixing agent,etc. Specifications: Main content(SO2): 65%min. Appearence: powder Iron(Fe): 0.005%max. Water insoluble: 0.05%max. Heavy metal(Pb): 0.002%max. Arsenic(As): 0.0002%max. PH value: 4.5-5.5 Packing: Net Weight:25,50kgs P.P. woven bag with pe liner;or 1000 kgs big bags.
