Application: 1>bleaching agent for textile fibres; 2>colors stripper and dechlorination; 3>preparation of indigo vat dye; 4>solubilizing and acidyfing agent for leather industries ; 5>bleaching agent forpaper pulps; 6>preservative and sterilisation agent for food industries. Product specification: Tech grade food grade Na2s2o5 >95.0% >97.0% So2 --------- >65% Fe
