Application：
（1）It is widely used in textile industry as reducing agent, reducing wool bleaching agent, printing auxiliaries, refining and bleaching agent of silk, stripper of dyed fabric and cleaning agent of dyeing vat.
（2）It is widely used in paper industry as bleaching agent of mechanical pulp, thermomechanical pulp and deinking pulp. It is the most suitable bleaching agent for wood pulp papermaking.
（3）As a reducing bleaching agent, it is widely used in bleaching of kaolin, bleaching and reducing whitening of fur, bleaching of bamboo products and straw knitted products.
（4）It can be used in mineral processing, synthesis of thiourea and its sulfide.
（5）It is used as reducing agent in chemical industry.
（6）Food additive grade is mainly used in food industry, widely used as bleaching agent and Edible Preservative for preserved fruits, dried fruits, dried vegetables, vermicelli, glucose, sugar, rock sugar, maltose, candy, liquid glucose, bamboo shoots, mushrooms and canned mushrooms.
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