Sodium Hydrosulphite

1. Formula:Na2S2O4
2.Poperties :Free-flowing white crystalline powder with a slight odor of sulfur dioxide

3. Specification
Grade                              90%Grade       88%Grade         85% grade
Na2S2O4                              90%                  88%                   85%
Fe                                        20ppm              20ppm                20ppm
Zn                                         1ppm                1ppm                 1ppm
other heavy metal(as Pb)     1ppm                 1ppm                1ppm
water insolubles                  0.05%               0.05%                 0.05%

4. Usage:vat dyeing, printing and stripping , reduction cleaning, leaching textile materials such as silk,wool, nylon and other fibres bleaching mechanical pulps ,thermo-mechanical pulps, deinked pulps bleaching kaolin bleaching foodstuffs like sugar, honey , gelatin etc . Reducing agent for organic synthesis and pharmaceuticals.