Formula:

Na₂S₂O₃

M.W.:    

158.13

Appearance:

Colorless monoclinic crystal or white powder.

Specifications: 

                               A                     B    

Na₂S₂O₃:                       99.0% min          99.0% min

Insoluble in Water:          0.01% max         0.01% max

Na₂S:                         0.001% max       0.001% max

Fe:                         0.002% max         0.002% max

Particle Size (grain/gram):  15 - 18           18 - 35

PH (200g/L Solution):         6.5 - 9.5         6.5 - 9.5

Package: 

in 25kg net bags with PE liner.