Property：White or light-yellow crystalline powder, smell
of SO2. No other smell when dried. Specific gravity is 1.4. It's soluble in
glycerine, it's soluble slightly in alcohol.
Food Grade: Mainly used as bleaching agent, bulking agent, antioxidant preservatives in food processing.
Tech Grade: Mainly used for producing medicine
iodoform, vanillin photographic fixative, rubber solidifying agent, decolorizing
agent of bleached fiber, leather treatment of leather making industry, etc.
Packing：Net in 25KG plastic woven bag.